{"id":332895,"date":"2022-05-07T21:00:07","date_gmt":"2022-05-07T21:00:07","guid":{"rendered":"http:\/\/savepearlharbor.com\/?p=332895"},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-29T21:00:00","slug":"","status":"publish","type":"post","link":"https:\/\/savepearlharbor.com\/?p=332895","title":{"rendered":"<span>\u041a\u0430\u043a \u0440\u0438\u0441\u043e\u0432\u0430\u0442\u044c \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e SQL?<\/span>"},"content":{"rendered":"<div><\/div>\n<div id=\"post-content-body\">\n<div>\n<div class=\"article-formatted-body article-formatted-body article-formatted-body_version-2\">\n<div xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\">\n<p>\u0412\u0438\u0434\u0438\u043c\u043e \u044f \u0441\u0434\u0435\u043b\u0430\u043b\u0430 \u043a\u0430\u043a\u043e\u0435-\u0442\u043e \u043e\u0447\u0435\u043d\u044c \u043f\u043b\u043e\u0445\u043e\u0435 \u0437\u043b\u043e, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u0436\u0438\u0432\u0443 \u0432\u043e \u0432\u0440\u0435\u043c\u044f \u043f\u0435\u0440\u0435\u043c\u0435\u043d. \u0421\u043f\u0440\u0430\u0432\u0438\u0442\u044c\u0441\u044f \u0441 \u044d\u043c\u043e\u0446\u0438\u044f\u043c\u0438 \u0438 \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u044e \u043a\u043e\u043d\u043a\u0443\u0440\u0435\u043d\u0442\u043e\u0441\u043f\u043e\u0441\u043e\u0431\u043d\u043e\u0441\u0442\u044c \u043d\u0430 \u0440\u044b\u043d\u043a\u0435 Data Enigneer\u2019\u043e\u0432 \u043c\u043d\u0435 \u043f\u043e\u043c\u043e\u0433\u0430\u0435\u0442 \u0441\u0430\u0439\u0442 Hackerrank. \u041d\u0430 \u043f\u0443\u0442\u0438 \u043a \u0440\u0435\u0448\u0435\u043d\u0438\u044e \u0432\u043e\u043e\u0431\u0449\u0435 \u0432\u0441\u0435\u0445 \u0437\u0430\u0434\u0430\u0447 \u043f\u043e SQL \u0441 \u044d\u0442\u043e\u0433\u043e \u0441\u0430\u0439\u0442\u0430 \u043c\u043d\u0435 \u043f\u043e\u043f\u0430\u043b\u0430\u0441\u044c <a href=\"https:\/\/www.hackerrank.com\/challenges\/draw-the-triangle-1\/problem\" rel=\"noopener noreferrer nofollow\">\u0437\u0430\u0434\u0430\u0447\u043a\u0430<\/a> \u043d\u0430 \u043d\u0435\u0442\u0440\u0438\u0432\u0438\u0430\u043b\u044c\u043d\u044b\u0435 \u0437\u0430\u043f\u0440\u043e\u0441\u044b.<\/p>\n<p>\u0412 \u0437\u0430\u0434\u0430\u0447\u043a\u0435 \u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043b\u043e\u0441\u044c \u0437\u0432\u0451\u0437\u0434\u043e\u0447\u043a\u0430\u043c\u0438 \u043d\u0430\u0440\u0438\u0441\u043e\u0432\u0430\u0442\u044c \u043f\u0440\u044f\u043c\u043e\u0443\u0433\u043e\u043b\u044c\u043d\u044b\u0439 \u0442\u0440\u0435\u0443\u0433\u043e\u043b\u044c\u043d\u0438\u043a.<\/p>\n<p>\u041f\u043e\u043d\u044f\u0442\u043d\u043e, \u0447\u0442\u043e \u043c\u043e\u0436\u043d\u043e \u0431\u044b\u043b\u043e \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u043a\u0430\u043a-\u0442\u043e \u0442\u0430\u043a:<\/p>\n<pre><code class=\"sql\">SELECT '*'  UNION ALL SELECT '* *'  UNION ALL ...<\/code><\/pre>\n<p>\u041d\u043e \u044d\u0442\u043e \u0434\u0438\u043a\u043e \u0441\u043a\u0443\u0447\u043d\u043e \u0438 \u043d\u0435\u043a\u0440\u0430\u0441\u0438\u0432\u043e.<\/p>\n<p>\u0414\u0430\u0432\u0430\u0439\u0442\u0435 \u0440\u0430\u0437\u0431\u0435\u0440\u0435\u043c\u0441\u044f, \u043a\u0430\u043a \u0440\u0438\u0441\u043e\u0432\u0430\u0442\u044c \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e SQL, \u0438 \u043f\u0440\u0438 \u044d\u0442\u043e\u043c \u043e\u0449\u0443\u0449\u0430\u0442\u044c \u0441\u0435\u0431\u044f \u043d\u0430\u0441\u0442\u043e\u044f\u0449\u0438\u043c \u0442\u0432\u043e\u0440\u0446\u043e\u043c!<\/p>\n<p><strong>\u041e\u0440\u0438\u0433\u0438\u043d\u0430\u043b\u044c\u043d\u044b\u0439 \u0442\u0435\u043a\u0441\u0442 \u0437\u0430\u0434\u0430\u0447\u0438:<\/strong><\/p>\n<p><em>P(R)\u00a0represents a pattern drawn by Julia in\u00a0R\u00a0rows. The following pattern represents\u00a0P(5):<\/em><\/p>\n<pre><code>* * * * * * * * * * * * * * *<\/code><\/pre>\n<p><em>Write a query to print the pattern\u00a0P(20).<\/em><\/p>\n<p>\u041c\u043e\u0451 \u0440\u0435\u0448\u0435\u043d\u0438\u0435 \u0437\u0434\u0435\u0441\u044c \u0438 \u0434\u0430\u043b\u0435\u0435 \u043d\u0430 MySQL 8.0:<\/p>\n<pre><code class=\"sql\">SET @n = 20; WITH RECURSIVE seq AS (     SELECT 1 AS val      UNION ALL      SELECT val + 1      FROM seq      WHERE val+1 &lt;= @n )  SELECT REPEAT('* ', val)  FROM seq  ORDER BY val DESC;<\/code><\/pre>\n<p>\u0412 <a href=\"https:\/\/www.hackerrank.com\/challenges\/draw-the-triangle-2\/problem\" rel=\"noopener noreferrer nofollow\">\u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0439 \u0437\u0430\u0434\u0430\u0447\u043a\u0435<\/a> \u0442\u0440\u0435\u0443\u0433\u043e\u043b\u044c\u043d\u0438\u043a \u043d\u0430\u0434\u043e \u0431\u044b\u043b\u043e \u043f\u0435\u0440\u0435\u0432\u0435\u0440\u043d\u0443\u0442\u044c, \u0447\u0442\u043e \u0440\u0435\u0448\u0430\u0435\u0442\u0441\u044f \u0443\u0434\u0430\u043b\u0435\u043d\u0438\u0435\u043c ORDER BY.<\/p>\n<p><strong>\u041f\u043e\u0441\u043b\u0435 \u044d\u0442\u0438\u0445 \u0437\u0430\u0434\u0430\u0447 \u044f \u0437\u0430\u0434\u0443\u043c\u0430\u043b\u0430\u0441\u044c: \u0430 \u043a\u0430\u043a \u043d\u0435 \u043c\u0435\u043d\u0435\u0435 \u0438\u0437\u044f\u0449\u043d\u043e \u043d\u0430\u0440\u0438\u0441\u043e\u0432\u0430\u0442\u044c \u0440\u0430\u0432\u043d\u043e\u0431\u0435\u0434\u0440\u0435\u043d\u043d\u044b\u0439 \u0442\u0440\u0435\u0443\u0433\u043e\u043b\u044c\u043d\u0438\u043a?<\/strong><\/p>\n<pre><code class=\"sql\">SET @n = 4; SET @fill = '8'; SET @sp = '.'; WITH RECURSIVE seq AS (     SELECT 1 AS val      UNION ALL      SELECT val + 1      FROM seq      WHERE val+1 &lt;= @n )  SELECT CONCAT(REPEAT(@sp, @n - val),                REPEAT(CONCAT(@fill, @sp), val),                REPEAT(@sp, @n - val - 1)) FROM seq;<\/code><\/pre>\n<p>\u0417\u0434\u0435\u0441\u044c \u044f \u0440\u0435\u0448\u0438\u043b\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u043a\u0430\u043a \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0435 \u043a\u0438\u0440\u043f\u0438\u0447\u0438\u043a\u0438 \u043d\u0430\u0448\u0435\u0439 \u043a\u0430\u0440\u0442\u0438\u043d\u044b, \u0447\u0442\u043e\u0431\u044b \u043f\u043e\u043b\u0443\u0447\u0430\u0442\u044c \u0431\u043e\u043b\u0435\u0435 \u0442\u0432\u043e\u0440\u0447\u0435\u0441\u043a\u0438\u0435 \u043a\u0430\u0440\u0442\u0438\u043d\u043a\u0438.<\/p>\n<p>\u0412\u043e\u0442 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442:<\/p>\n<pre><code>...8... ..8.8.. .8.8.8. 8.8.8.8.<\/code><\/pre>\n<p><strong>\u0410 \u0447\u0442\u043e \u043d\u0430\u0441\u0447\u0451\u0442 \u043a\u0440\u0443\u0436\u043e\u0447\u043a\u0430?<\/strong><\/p>\n<pre><code class=\"sql\">SET @n = 20; SET @fill = '8'; SET @sp = '.'; SET @r_x = 8; SET @r_y = 5;  \/* Procedure which draws lines by points *\/ DELIMITER $$  CREATE FUNCTION draw_circle(x_points VARCHAR(255))  RETURNS varchar(255)  NO SQL BEGIN    DECLARE c INT;   DECLARE str VARCHAR(255);   SET c = 0;   SET str = '';    line_loop: LOOP     IF c > @n THEN LEAVE line_loop; END IF;     IF FIND_IN_SET(CAST(c AS CHAR), x_points)         THEN SET str = CONCAT(str, @fill);         ELSE SET str = CONCAT(str, @sp);     END IF;     SET c = c + 1;     ITERATE line_loop;   END LOOP;   RETURN str; END $$ DELIMITER ;  \/* Here we get points for circle *\/ WITH RECURSIVE seq AS (     SELECT 0 AS x, 0 AS y, 0 AS val     UNION ALL      SELECT        round(@r_x + @r_x * COS(2 * PI() * val \/ @n)) as x,        round(@r_y + @r_y * SIN(2 * PI() * val \/ @n)) as y,       val + 1     FROM seq      WHERE val &lt; @n ) , points AS (     SELECT GROUP_CONCAT(x) AS xs, y     FROM seq     WHERE val > 0     GROUP BY y     ORDER BY y ASC ) SELECT     draw_circle(xs) FROM     points ;<\/code><\/pre>\n<p>\u0417\u0434\u0435\u0441\u044c \u043f\u0440\u0438\u0448\u043b\u043e\u0441\u044c \u043f\u043e\u043f\u043e\u0442\u0435\u0442\u044c: \u0440\u0430\u0437\u043e\u0431\u0440\u0430\u0442\u044c\u0441\u044f \u0441 \u0444\u0443\u043d\u043a\u0446\u0438\u044f\u043c\u0438 \u0438 \u0446\u0438\u043a\u043b\u0430\u043c\u0438 \u0432 MySQL, \u0434\u0438\u0441\u043a\u0440\u0435\u0442\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0444\u043e\u0440\u043c\u0443\u043b\u0443 \u043e\u043a\u0440\u0443\u0436\u043d\u043e\u0441\u0442\u0438.<\/p>\n<p>\u0417\u0430\u0442\u043e \u043a\u0430\u043a\u043e\u0432 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442:<\/p>\n<pre><code>.......8..8..8.......  ....8...........8....  ..8...............8..  8...................8  8...................8  8...................8  ..8...............8..  ....8...........8....  .......8..8..8....... <\/code><\/pre>\n<p><strong>\u0422\u0435\u043f\u0435\u0440\u044c \u043d\u0430\u0440\u0438\u0441\u0443\u0435\u043c \u0448\u0430\u0445\u043c\u0430\u0442\u043d\u0443\u044e \u0434\u043e\u0441\u043a\u0443.<\/strong><\/p>\n<pre><code class=\"sql\">SET @n = 8; SET @fill = '#'; SET @sp = '.';  \/* Procedure which draws lines by points *\/ DROP FUNCTION IF EXISTS draw_chessboard; DELIMITER $$  CREATE FUNCTION draw_chessboard(i INTEGER)  RETURNS varchar(255)  NO SQL BEGIN    DECLARE c INT;   DECLARE str VARCHAR(255);   SET c = 0;   SET str = '';    line_loop: LOOP     IF c > @n THEN LEAVE line_loop; END IF;     IF i mod 2 = 0 THEN         IF c mod 2 &lt;> 0          THEN SET str = CONCAT(str, @fill);          ELSE SET str = CONCAT(str, @sp);         END IF;     ELSEIF i mod 2 &lt;> 0 THEN         IF c mod 2 = 0          THEN SET str = CONCAT(str, @fill);          ELSE SET str = CONCAT(str, @sp);         END IF;     END IF;     SET c = c + 1;     ITERATE line_loop;   END LOOP;   RETURN str; END $$ DELIMITER ;  WITH RECURSIVE seq AS (     SELECT 1 AS val     UNION ALL      SELECT        val + 1 AS val     FROM seq      WHERE val &lt; @n ) SELECT     draw_chessboard(val) FROM     seq ;<\/code><\/pre>\n<p>\u0420\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442:<\/p>\n<pre><code>#_#_#_#_#         _#_#_#_#_         #_#_#_#_#         _#_#_#_#_         #_#_#_#_#         _#_#_#_#_         #_#_#_#_#         _#_#_#_#_   <\/code><\/pre>\n<p><strong>\u041f\u043e\u0434 \u043a\u043e\u043d\u0435\u0446 \u043f\u0435\u0440\u0435\u0439\u0434\u0435\u043c \u043a \u0447\u0435\u043c\u0443-\u0442\u043e \u043f\u043e\u0441\u0435\u0440\u044c\u0435\u0437\u043d\u0435\u0435! \u041a \u0441\u0435\u0440\u0434\u0435\u0447\u043a\u0443!<\/strong><\/p>\n<pre><code class=\"sql\">SET @n = 40; SET @fill = '8'; SET @sp = '.'; SET @r_x = 16; SET @r_y = 16;  \/* Procedure which draws lines by points *\/ DROP FUNCTION IF EXISTS draw_heart; DELIMITER $$  CREATE FUNCTION draw_heart(x_points VARCHAR(255))  RETURNS varchar(255)  NO SQL BEGIN    DECLARE c INT;   DECLARE str VARCHAR(255);   SET c = 0;   SET str = '';    line_loop: LOOP     IF c > @r_x * 2 THEN LEAVE line_loop; END IF;     IF FIND_IN_SET(CAST(c AS CHAR), x_points)         THEN SET str = CONCAT(str, @fill);         ELSE SET str = CONCAT(str, @sp);     END IF;     SET c = c + 1;     ITERATE line_loop;   END LOOP;   RETURN str; END $$ DELIMITER ;  \/* Here we get points for heart *\/ WITH RECURSIVE seq AS (     SELECT 0 AS x, 0 AS y, 0 AS val     UNION ALL      SELECT        round(@r_x + 16 * POWER(SIN(2 * PI() * val \/ @n), 3)) as x,        round(2 * @r_y - ( 13 * COS(2 * PI() * val \/ @n) - 5 * COS(4 * PI() * val \/ @n) - 2 * COS(6 * PI() * val \/ @n) - COS(8 * PI() * val \/ @n) ) ) as y,       val + 1     FROM seq      WHERE val &lt; @n ) , points AS (     SELECT GROUP_CONCAT(x) AS xs, y     FROM seq     WHERE val > 0     GROUP BY y     ORDER BY y ASC ) SELECT     draw_heart(xs) FROM     points ;<\/code><\/pre>\n<p>\u0424\u043e\u0440\u043c\u0443\u043b\u0443 \u0434\u043b\u044f \u0441\u0435\u0440\u0434\u0446\u0430 \u044f \u0434\u043e\u0431\u044b\u043b\u0430 \u0437\u0434\u0435\u0441\u044c: <a href=\"http:\/\/www.wolframalpha-ru.com\/2012\/03\/blog-post.html\" rel=\"noopener noreferrer nofollow\">http:\/\/www.wolframalpha-ru.com\/2012\/03\/blog-post.html<\/a>, \u0438 \u044d\u0442\u043e \u0431\u044b\u043b\u043e \u0441\u0430\u043c\u043e\u0439 \u0441\u043b\u043e\u0436\u043d\u043e\u0439 \u0447\u0430\u0441\u0442\u044c\u044e \u0440\u0438\u0441\u0443\u043d\u043a\u0430.<\/p>\n<p>\u0420\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442:<\/p>\n<pre><code>........8.8...........8.8........  .....8.....................8.....  .............8.....8.............  ..8............8.8............8..  .8..............8..............8.  ................8................  8...............................8  .8.............................8.  ..8...........................8..  .....8.....................8.....  ........8...............8........  ..........8...........8..........  .............8.....8.............  ...............8.8...............  ................8................  ................8................ <\/code><\/pre>\n<p>\u0412\u043e\u0442 \u0442\u0430\u043a\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c \u043c\u043e\u0436\u043d\u043e \u043f\u043e\u0447\u0443\u0432\u0441\u0442\u0432\u043e\u0432\u0430\u0442\u044c \u0441\u0435\u0431\u044f \u0442\u0432\u043e\u0440\u0446\u043e\u043c, \u0431\u0443\u0434\u0443\u0447\u0438 \u043f\u0440\u043e\u0441\u0442\u044b\u043c \u0434\u0430\u0442\u0430-\u0430\u043d\u0430\u043b\u0438\u0442\u0438\u043a\u043e\u043c. \u0422\u0435\u043c \u043d\u0435 \u043c\u0435\u043d\u0435\u0435, \u0443\u0432\u0435\u0440\u0435\u043d\u0430, \u0447\u0442\u043e \u043c\u043e\u0438 \u0440\u0435\u0448\u0435\u043d\u0438\u044f \u0434\u0430\u043b\u0435\u043a\u0438 \u043e\u0442 \u043e\u043f\u0442\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u0438, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u0436\u0434\u0443 \u0432\u0430\u0448\u0438\u0445 \u043a\u043e\u043c\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u0435\u0432 \u0438 \u0437\u0430\u043c\u0435\u0447\u0430\u043d\u0438\u0439.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"v-portal\" style=\"display:none;\"><\/div>\n<\/div>\n<p> <!----> <!----><br \/> \u0441\u0441\u044b\u043b\u043a\u0430 \u043d\u0430 \u043e\u0440\u0438\u0433\u0438\u043d\u0430\u043b \u0441\u0442\u0430\u0442\u044c\u0438 <a href=\"https:\/\/habr.com\/ru\/post\/664834\/\"> https:\/\/habr.com\/ru\/post\/664834\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<div><\/div>\n<div id=\"post-content-body\">\n<div>\n<div class=\"article-formatted-body article-formatted-body article-formatted-body_version-2\">\n<div xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\">\n<p>\u0412\u0438\u0434\u0438\u043c\u043e \u044f \u0441\u0434\u0435\u043b\u0430\u043b\u0430 \u043a\u0430\u043a\u043e\u0435-\u0442\u043e \u043e\u0447\u0435\u043d\u044c \u043f\u043b\u043e\u0445\u043e\u0435 \u0437\u043b\u043e, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u0436\u0438\u0432\u0443 \u0432\u043e \u0432\u0440\u0435\u043c\u044f \u043f\u0435\u0440\u0435\u043c\u0435\u043d. \u0421\u043f\u0440\u0430\u0432\u0438\u0442\u044c\u0441\u044f \u0441 \u044d\u043c\u043e\u0446\u0438\u044f\u043c\u0438 \u0438 \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u044e \u043a\u043e\u043d\u043a\u0443\u0440\u0435\u043d\u0442\u043e\u0441\u043f\u043e\u0441\u043e\u0431\u043d\u043e\u0441\u0442\u044c \u043d\u0430 \u0440\u044b\u043d\u043a\u0435 Data Enigneer\u2019\u043e\u0432 \u043c\u043d\u0435 \u043f\u043e\u043c\u043e\u0433\u0430\u0435\u0442 \u0441\u0430\u0439\u0442 Hackerrank. \u041d\u0430 \u043f\u0443\u0442\u0438 \u043a \u0440\u0435\u0448\u0435\u043d\u0438\u044e \u0432\u043e\u043e\u0431\u0449\u0435 \u0432\u0441\u0435\u0445 \u0437\u0430\u0434\u0430\u0447 \u043f\u043e SQL \u0441 \u044d\u0442\u043e\u0433\u043e \u0441\u0430\u0439\u0442\u0430 \u043c\u043d\u0435 \u043f\u043e\u043f\u0430\u043b\u0430\u0441\u044c <a href=\"https:\/\/www.hackerrank.com\/challenges\/draw-the-triangle-1\/problem\" rel=\"noopener noreferrer nofollow\">\u0437\u0430\u0434\u0430\u0447\u043a\u0430<\/a> \u043d\u0430 \u043d\u0435\u0442\u0440\u0438\u0432\u0438\u0430\u043b\u044c\u043d\u044b\u0435 \u0437\u0430\u043f\u0440\u043e\u0441\u044b.<\/p>\n<p>\u0412 \u0437\u0430\u0434\u0430\u0447\u043a\u0435 \u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043b\u043e\u0441\u044c \u0437\u0432\u0451\u0437\u0434\u043e\u0447\u043a\u0430\u043c\u0438 \u043d\u0430\u0440\u0438\u0441\u043e\u0432\u0430\u0442\u044c \u043f\u0440\u044f\u043c\u043e\u0443\u0433\u043e\u043b\u044c\u043d\u044b\u0439 \u0442\u0440\u0435\u0443\u0433\u043e\u043b\u044c\u043d\u0438\u043a.<\/p>\n<p>\u041f\u043e\u043d\u044f\u0442\u043d\u043e, \u0447\u0442\u043e \u043c\u043e\u0436\u043d\u043e \u0431\u044b\u043b\u043e \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u043a\u0430\u043a-\u0442\u043e \u0442\u0430\u043a:<\/p>\n<pre><code class=\"sql\">SELECT '*'  UNION ALL SELECT '* *'  UNION ALL ...<\/code><\/pre>\n<p>\u041d\u043e \u044d\u0442\u043e \u0434\u0438\u043a\u043e \u0441\u043a\u0443\u0447\u043d\u043e \u0438 \u043d\u0435\u043a\u0440\u0430\u0441\u0438\u0432\u043e.<\/p>\n<p>\u0414\u0430\u0432\u0430\u0439\u0442\u0435 \u0440\u0430\u0437\u0431\u0435\u0440\u0435\u043c\u0441\u044f, \u043a\u0430\u043a \u0440\u0438\u0441\u043e\u0432\u0430\u0442\u044c \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e SQL, \u0438 \u043f\u0440\u0438 \u044d\u0442\u043e\u043c \u043e\u0449\u0443\u0449\u0430\u0442\u044c \u0441\u0435\u0431\u044f \u043d\u0430\u0441\u0442\u043e\u044f\u0449\u0438\u043c \u0442\u0432\u043e\u0440\u0446\u043e\u043c!<\/p>\n<p><strong>\u041e\u0440\u0438\u0433\u0438\u043d\u0430\u043b\u044c\u043d\u044b\u0439 \u0442\u0435\u043a\u0441\u0442 \u0437\u0430\u0434\u0430\u0447\u0438:<\/strong><\/p>\n<p><em>P(R)\u00a0represents a pattern drawn by Julia in\u00a0R\u00a0rows. The following pattern represents\u00a0P(5):<\/em><\/p>\n<pre><code>* * * * * * * * * * * * * * *<\/code><\/pre>\n<p><em>Write a query to print the pattern\u00a0P(20).<\/em><\/p>\n<p>\u041c\u043e\u0451 \u0440\u0435\u0448\u0435\u043d\u0438\u0435 \u0437\u0434\u0435\u0441\u044c \u0438 \u0434\u0430\u043b\u0435\u0435 \u043d\u0430 MySQL 8.0:<\/p>\n<pre><code class=\"sql\">SET @n = 20; WITH RECURSIVE seq AS (     SELECT 1 AS val      UNION ALL      SELECT val + 1      FROM seq      WHERE val+1 &lt;= @n )  SELECT REPEAT('* ', val)  FROM seq  ORDER BY val DESC;<\/code><\/pre>\n<p>\u0412 <a href=\"https:\/\/www.hackerrank.com\/challenges\/draw-the-triangle-2\/problem\" rel=\"noopener noreferrer nofollow\">\u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0439 \u0437\u0430\u0434\u0430\u0447\u043a\u0435<\/a> \u0442\u0440\u0435\u0443\u0433\u043e\u043b\u044c\u043d\u0438\u043a \u043d\u0430\u0434\u043e \u0431\u044b\u043b\u043e \u043f\u0435\u0440\u0435\u0432\u0435\u0440\u043d\u0443\u0442\u044c, \u0447\u0442\u043e \u0440\u0435\u0448\u0430\u0435\u0442\u0441\u044f \u0443\u0434\u0430\u043b\u0435\u043d\u0438\u0435\u043c ORDER BY.<\/p>\n<p><strong>\u041f\u043e\u0441\u043b\u0435 \u044d\u0442\u0438\u0445 \u0437\u0430\u0434\u0430\u0447 \u044f \u0437\u0430\u0434\u0443\u043c\u0430\u043b\u0430\u0441\u044c: \u0430 \u043a\u0430\u043a \u043d\u0435 \u043c\u0435\u043d\u0435\u0435 \u0438\u0437\u044f\u0449\u043d\u043e \u043d\u0430\u0440\u0438\u0441\u043e\u0432\u0430\u0442\u044c \u0440\u0430\u0432\u043d\u043e\u0431\u0435\u0434\u0440\u0435\u043d\u043d\u044b\u0439 \u0442\u0440\u0435\u0443\u0433\u043e\u043b\u044c\u043d\u0438\u043a?<\/strong><\/p>\n<pre><code class=\"sql\">SET @n = 4; SET @fill = '8'; SET @sp = '.'; WITH RECURSIVE seq AS (     SELECT 1 AS val      UNION ALL      SELECT val + 1      FROM seq      WHERE val+1 &lt;= @n )  SELECT CONCAT(REPEAT(@sp, @n - val),                REPEAT(CONCAT(@fill, @sp), val),                REPEAT(@sp, @n - val - 1)) FROM seq;<\/code><\/pre>\n<p>\u0417\u0434\u0435\u0441\u044c \u044f \u0440\u0435\u0448\u0438\u043b\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u043a\u0430\u043a \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0435 \u043a\u0438\u0440\u043f\u0438\u0447\u0438\u043a\u0438 \u043d\u0430\u0448\u0435\u0439 \u043a\u0430\u0440\u0442\u0438\u043d\u044b, \u0447\u0442\u043e\u0431\u044b \u043f\u043e\u043b\u0443\u0447\u0430\u0442\u044c \u0431\u043e\u043b\u0435\u0435 \u0442\u0432\u043e\u0440\u0447\u0435\u0441\u043a\u0438\u0435 \u043a\u0430\u0440\u0442\u0438\u043d\u043a\u0438.<\/p>\n<p>\u0412\u043e\u0442 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442:<\/p>\n<pre><code>...8... ..8.8.. .8.8.8. 8.8.8.8.<\/code><\/pre>\n<p><strong>\u0410 \u0447\u0442\u043e \u043d\u0430\u0441\u0447\u0451\u0442 \u043a\u0440\u0443\u0436\u043e\u0447\u043a\u0430?<\/strong><\/p>\n<pre><code class=\"sql\">SET @n = 20; SET @fill = '8'; SET @sp = '.'; SET @r_x = 8; SET @r_y = 5;  \/* Procedure which draws lines by points *\/ DELIMITER $$  CREATE FUNCTION draw_circle(x_points VARCHAR(255))  RETURNS varchar(255)  NO SQL BEGIN    DECLARE c INT;   DECLARE str VARCHAR(255);   SET c = 0;   SET str = '';    line_loop: LOOP     IF c > @n THEN LEAVE line_loop; END IF;     IF FIND_IN_SET(CAST(c AS CHAR), x_points)         THEN SET str = CONCAT(str, @fill);         ELSE SET str = CONCAT(str, @sp);     END IF;     SET c = c + 1;     ITERATE line_loop;   END LOOP;   RETURN str; END $$ DELIMITER ;  \/* Here we get points for circle *\/ WITH RECURSIVE seq AS (     SELECT 0 AS x, 0 AS y, 0 AS val     UNION ALL      SELECT        round(@r_x + @r_x * COS(2 * PI() * val \/ @n)) as x,        round(@r_y + @r_y * SIN(2 * PI() * val \/ @n)) as y,       val + 1     FROM seq      WHERE val &lt; @n ) , points AS (     SELECT GROUP_CONCAT(x) AS xs, y     FROM seq     WHERE val > 0     GROUP BY y     ORDER BY y ASC ) SELECT     draw_circle(xs) FROM     points ;<\/code><\/pre>\n<p>\u0417\u0434\u0435\u0441\u044c \u043f\u0440\u0438\u0448\u043b\u043e\u0441\u044c \u043f\u043e\u043f\u043e\u0442\u0435\u0442\u044c: \u0440\u0430\u0437\u043e\u0431\u0440\u0430\u0442\u044c\u0441\u044f \u0441 \u0444\u0443\u043d\u043a\u0446\u0438\u044f\u043c\u0438 \u0438 \u0446\u0438\u043a\u043b\u0430\u043c\u0438 \u0432 MySQL, \u0434\u0438\u0441\u043a\u0440\u0435\u0442\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0444\u043e\u0440\u043c\u0443\u043b\u0443 \u043e\u043a\u0440\u0443\u0436\u043d\u043e\u0441\u0442\u0438.<\/p>\n<p>\u0417\u0430\u0442\u043e \u043a\u0430\u043a\u043e\u0432 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442:<\/p>\n<pre><code>.......8..8..8.......  ....8...........8....  ..8...............8..  8...................8  8...................8  8...................8  ..8...............8..  ....8...........8....  .......8..8..8....... <\/code><\/pre>\n<p><strong>\u0422\u0435\u043f\u0435\u0440\u044c \u043d\u0430\u0440\u0438\u0441\u0443\u0435\u043c \u0448\u0430\u0445\u043c\u0430\u0442\u043d\u0443\u044e \u0434\u043e\u0441\u043a\u0443.<\/strong><\/p>\n<pre><code class=\"sql\">SET @n = 8; SET @fill = '#'; SET @sp = '.';  \/* Procedure which draws lines by points *\/ DROP FUNCTION IF EXISTS draw_chessboard; DELIMITER $$  CREATE FUNCTION draw_chessboard(i INTEGER)  RETURNS varchar(255)  NO SQL BEGIN    DECLARE c INT;   DECLARE str VARCHAR(255);   SET c = 0;   SET str = '';    line_loop: LOOP     IF c > @n THEN LEAVE line_loop; END IF;     IF i mod 2 = 0 THEN         IF c mod 2 &lt;> 0          THEN SET str = CONCAT(str, @fill);          ELSE SET str = CONCAT(str, @sp);         END IF;     ELSEIF i mod 2 &lt;> 0 THEN         IF c mod 2 = 0          THEN SET str = CONCAT(str, @fill);          ELSE SET str = CONCAT(str, @sp);         END IF;     END IF;     SET c = c + 1;     ITERATE line_loop;   END LOOP;   RETURN str; END $$ DELIMITER ;  WITH RECURSIVE seq AS (     SELECT 1 AS val     UNION ALL      SELECT        val + 1 AS val     FROM seq      WHERE val &lt; @n ) SELECT     draw_chessboard(val) FROM     seq ;<\/code><\/pre>\n<p>\u0420\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442:<\/p>\n<pre><code>#_#_#_#_#         _#_#_#_#_         #_#_#_#_#         _#_#_#_#_         #_#_#_#_#         _#_#_#_#_         #_#_#_#_#         _#_#_#_#_   <\/code><\/pre>\n<p><strong>\u041f\u043e\u0434 \u043a\u043e\u043d\u0435\u0446 \u043f\u0435\u0440\u0435\u0439\u0434\u0435\u043c \u043a \u0447\u0435\u043c\u0443-\u0442\u043e \u043f\u043e\u0441\u0435\u0440\u044c\u0435\u0437\u043d\u0435\u0435! \u041a \u0441\u0435\u0440\u0434\u0435\u0447\u043a\u0443!<\/strong><\/p>\n<pre><code class=\"sql\">SET @n = 40; SET @fill = '8'; SET @sp = '.'; SET @r_x = 16; SET @r_y = 16;  \/* Procedure which draws lines by points *\/ DROP FUNCTION IF EXISTS draw_heart; DELIMITER $$  CREATE FUNCTION draw_heart(x_points VARCHAR(255))  RETURNS varchar(255)  NO SQL BEGIN    DECLARE c INT;   DECLARE str VARCHAR(255);   SET c = 0;   SET str = '';    line_loop: LOOP     IF c > @r_x * 2 THEN LEAVE line_loop; END IF;     IF FIND_IN_SET(CAST(c AS CHAR), x_points)         THEN SET str = CONCAT(str, @fill);         ELSE SET str = CONCAT(str, @sp);     END IF;     SET c = c + 1;     ITERATE line_loop;   END LOOP;   RETURN str; END $$ DELIMITER ;  \/* Here we get points for heart *\/ WITH RECURSIVE seq AS (     SELECT 0 AS x, 0 AS y, 0 AS val     UNION ALL      SELECT        round(@r_x + 16 * POWER(SIN(2 * PI() * val \/ @n), 3)) as x,        round(2 * @r_y - ( 13 * COS(2 * PI() * val \/ @n) - 5 * COS(4 * PI() * val \/ @n) - 2 * COS(6 * PI() * val \/ @n) - COS(8 * PI() * val \/ @n) ) ) as y,       val + 1     FROM seq      WHERE val &lt; @n ) , points AS (     SELECT GROUP_CONCAT(x) AS xs, y     FROM seq     WHERE val > 0     GROUP BY y     ORDER BY y ASC ) SELECT     draw_heart(xs) FROM     points ;<\/code><\/pre>\n<p>\u0424\u043e\u0440\u043c\u0443\u043b\u0443 \u0434\u043b\u044f \u0441\u0435\u0440\u0434\u0446\u0430 \u044f \u0434\u043e\u0431\u044b\u043b\u0430 \u0437\u0434\u0435\u0441\u044c: <a href=\"http:\/\/www.wolframalpha-ru.com\/2012\/03\/blog-post.html\" rel=\"noopener noreferrer nofollow\">http:\/\/www.wolframalpha-ru.com\/2012\/03\/blog-post.html<\/a>, \u0438 \u044d\u0442\u043e \u0431\u044b\u043b\u043e \u0441\u0430\u043c\u043e\u0439 \u0441\u043b\u043e\u0436\u043d\u043e\u0439 \u0447\u0430\u0441\u0442\u044c\u044e \u0440\u0438\u0441\u0443\u043d\u043a\u0430.<\/p>\n<p>\u0420\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442:<\/p>\n<pre><code>........8.8...........8.8........  .....8.....................8.....  .............8.....8.............  ..8............8.8............8..  .8..............8..............8.  ................8................  8...............................8  .8.............................8.  ..8...........................8..  .....8.....................8.....  ........8...............8........  ..........8...........8..........  .............8.....8.............  ...............8.8...............  ................8................  ................8................ <\/code><\/pre>\n<p>\u0412\u043e\u0442 \u0442\u0430\u043a\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c \u043c\u043e\u0436\u043d\u043e \u043f\u043e\u0447\u0443\u0432\u0441\u0442\u0432\u043e\u0432\u0430\u0442\u044c \u0441\u0435\u0431\u044f \u0442\u0432\u043e\u0440\u0446\u043e\u043c, \u0431\u0443\u0434\u0443\u0447\u0438 \u043f\u0440\u043e\u0441\u0442\u044b\u043c \u0434\u0430\u0442\u0430-\u0430\u043d\u0430\u043b\u0438\u0442\u0438\u043a\u043e\u043c. \u0422\u0435\u043c \u043d\u0435 \u043c\u0435\u043d\u0435\u0435, \u0443\u0432\u0435\u0440\u0435\u043d\u0430, \u0447\u0442\u043e \u043c\u043e\u0438 \u0440\u0435\u0448\u0435\u043d\u0438\u044f \u0434\u0430\u043b\u0435\u043a\u0438 \u043e\u0442 \u043e\u043f\u0442\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u0438, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u0436\u0434\u0443 \u0432\u0430\u0448\u0438\u0445 \u043a\u043e\u043c\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u0435\u0432 \u0438 \u0437\u0430\u043c\u0435\u0447\u0430\u043d\u0438\u0439.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"v-portal\" style=\"display:none;\"><\/div>\n<\/div>\n<p> <!----> <!----><br \/> \u0441\u0441\u044b\u043b\u043a\u0430 \u043d\u0430 \u043e\u0440\u0438\u0433\u0438\u043d\u0430\u043b \u0441\u0442\u0430\u0442\u044c\u0438 <a href=\"https:\/\/habr.com\/ru\/post\/664834\/\"> https:\/\/habr.com\/ru\/post\/664834\/<\/a><br \/><\/br><\/br><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-332895","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts\/332895","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=332895"}],"version-history":[{"count":0,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts\/332895\/revisions"}],"wp:attachment":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=332895"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=332895"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=332895"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}