{"id":1319,"date":"2019-07-04T13:55:52","date_gmt":"2019-07-04T10:55:52","guid":{"rendered":"http:\/\/langtoday.com\/?p=1319"},"modified":"2019-07-05T11:12:01","modified_gmt":"2019-07-05T08:12:01","slug":"%d0%b8%d1%81%d0%bf%d0%be%d0%bb%d1%8c%d0%b7%d0%be%d0%b2%d0%b0%d0%bd%d0%b8%d0%b5-%d0%ba%d0%be%d0%bd%d1%81%d1%82%d0%b0%d0%bd%d1%82-%d0%b2-select-%d0%b7%d0%b0%d0%bf%d1%80%d0%be%d1%81%d0%b0%d1%85-sql","status":"publish","type":"post","link":"https:\/\/langtoday.com\/?p=1319","title":{"rendered":"\u0418\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u043a\u043e\u043d\u0441\u0442\u0430\u043d\u0442 \u0432 SELECT-\u0437\u0430\u043f\u0440\u043e\u0441\u0430\u0445 SQL"},"content":{"rendered":"\n<p>\u041b\u044e\u0431\u0438\u0442\u0435 \u043b\u0438 \u0432\u044b &#171;\u043c\u0430\u0433\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0447\u0438\u0441\u043b\u0430&#187; \u0432 \u043a\u043e\u0434\u0435? \u0412\u0441\u0435 \u044d\u0442\u0438 <em>if (a == 259)<\/em>&#8230; \u041d\u0438\u043a\u0442\u043e \u0438\u0445 \u043d\u0435 \u043b\u044e\u0431\u0438\u0442. \u0418 SQL-\u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u044d\u0442\u043e \u043a\u0430\u0441\u0430\u0435\u0442\u0441\u044f \u0432 \u0442\u043e\u0439 \u0436\u0435 \u0441\u0442\u0435\u043f\u0435\u043d\u0438, \u043a\u0430\u043a \u0438 \u044f\u0437\u044b\u043a\u043e\u0432 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f. &#171;\u041c\u0430\u0433\u0438\u0447\u0435\u0441\u043a\u0438\u0435&#187; \u0447\u0438\u0441\u043b\u0430 \u0434\u0435\u043b\u0430\u044e\u0442 \u043a\u043e\u0434 \u043d\u0435\u0447\u0438\u0442\u0430\u0435\u043c\u044b\u043c, \u043b\u044e\u0431\u044b\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0432 \u043d\u0451\u043c \u0431\u0443\u0434\u0443\u0442 \u0433\u043e\u043b\u043e\u0432\u043d\u043e\u0439 \u0431\u043e\u043b\u044c\u044e, \u0438 \u043d\u0443\u0436\u043d\u043e \u0432\u0441\u0435\u0433\u0434\u0430 \u0438\u0437\u0431\u0435\u0433\u0430\u0442\u044c \u0438\u0445, \u0435\u0441\u043b\u0438 \u0435\u0441\u0442\u044c \u0442\u0430\u043a\u0430\u044f \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c. \u0418\u0442\u0430\u043a, \u0443 \u0432\u0430\u0441 \u0435\u0441\u0442\u044c \u043f\u043e\u0442\u0440\u0435\u0431\u043d\u043e\u0441\u0442\u044c \u043d\u0430\u043f\u0438\u0441\u0430\u0442\u044c SELECT-\u0437\u0430\u043f\u0440\u043e\u0441. \u0418 \u0432 \u043d\u0451\u043c \u0435\u0441\u0442\u044c \u043a\u0430\u043a\u0438\u0435-\u0442\u043e \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u044f \u0441 \u043a\u043e\u043d\u0441\u0442\u0430\u043d\u0442\u0430\u043c\u0438 \u0438\u043b\u0438 \u0432\u044b\u0434\u0430\u0447\u0430 \u043d\u0435\u043a\u0438\u0445 \u0437\u0430\u0440\u0430\u043d\u0435\u0435 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u043d\u044b\u0445 \u043a\u043e\u043d\u0441\u0442\u0430\u043d\u0442 \u043f\u043e \u0443\u0441\u043b\u043e\u0432\u0438\u044e. \u0412 \u0442\u043e \u0436\u0435 \u0432\u0440\u0435\u043c\u044f, \u043f\u0440\u043e\u0441\u0442\u043e \u043e\u0431\u044a\u044f\u0432\u0438\u0442\u044c \u0438\u0445 \u0432 \u0442\u0435\u043a\u0441\u0442\u0435 \u0437\u0430\u043f\u0440\u043e\u0441\u0430 \u0443 \u0432\u0430\u0441 \u043d\u0435 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u0441\u044f, \u043d\u0435\u0442 \u0442\u0430\u043a\u043e\u0439 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438. \u041a \u0441\u0447\u0430\u0441\u0442\u044c\u044e, \u043a\u043e\u043b\u043b\u0435\u043a\u0442\u0438\u0432\u043d\u044b\u0439 \u0440\u0430\u0437\u0443\u043c \u043d\u0430\u0448\u0451\u043b \u0440\u0435\u0448\u0435\u043d\u0438\u0435.<\/p>\n\n\n\n<!--more-->\n\n\n\n<p>\u0412\u043e\u0437\u044c\u043c\u0451\u043c \u0441\u0430\u043c\u044b\u0439 \u043f\u0440\u043e\u0441\u0442\u043e\u0439 \u0441\u043b\u0443\u0447\u0430\u0439, \u043a\u043e\u0433\u0434\u0430 \u0432\u044b \u0445\u043e\u0442\u0438\u0442\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u043a\u0430\u043a\u0438\u0435-\u0442\u043e \u0447\u0438\u0441\u043b\u0430 \u0434\u043b\u044f \u0440\u0430\u0441\u0447\u0451\u0442\u043e\u0432 \u0438\u043b\u0438 \u0432\u044b\u0434\u0430\u0447\u0438. \u041f\u043e\u0434\u043e\u0439\u0434\u0451\u0442 \u0442\u0430\u043a\u043e\u0435 \u0440\u0435\u0448\u0435\u043d\u0438\u0435:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">WITH consts AS (SELECT \n                        <em>3.14<\/em> AS pi,\n                      2.68 AS e)\nSELECT some_table.col1, \n(CASE WHEN some_table.col1 &lt; consts.pi THEN true ELSE false) AS less_than_pi,\n(CASE WHEN some_table.col1 &lt; consts.e THEN true ELSE false) AS less_than_e \nFROM consts, some_table<\/pre>\n\n\n\n<p>\u0417\u0434\u0435\u0441\u044c \u043c\u044b \u0432\u044b\u0431\u0438\u0440\u0430\u0435\u043c \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 <em>col1 <\/em>\u0438\u0437 \u0442\u0430\u0431\u043b\u0438\u0446\u044b <em>some_table<\/em>, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0432 \u0441\u0442\u043e\u043b\u0431\u0446\u0435 <em>less_than_pi <\/em>\u0432\u044b\u0432\u043e\u0434\u0438\u043c true, \u0435\u0441\u043b\u0438 <em>col1 <\/em>\u043c\u0435\u043d\u044c\u0448\u0435 \u0447\u0438\u0441\u043b\u0430 \u043f\u0438, \u0438 false, \u0435\u0441\u043b\u0438 \u043d\u0435\u0442. \u0422\u043e \u0436\u0435 \u0441\u0430\u043c\u043e\u0435 \u0434\u043b\u044f \u0447\u0438\u0441\u043b\u0430 e. \u041e\u0431\u0440\u0430\u0442\u0438\u0442\u0435 \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435, \u043a\u0430\u043a \u0432 \u0442\u0430\u0431\u043b\u0438\u0446\u0435 <em>consts <\/em>\u043c\u044b \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u043b\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0435 \u0434\u0430\u043b\u044c\u0448\u0435 \u043a\u043e\u043d\u0441\u0442\u0430\u043d\u0442\u044b, \u043f\u0440\u0438\u0441\u043e\u0435\u0434\u0438\u043d\u0438\u043b\u0438 \u044d\u0442\u0443 \u0442\u0430\u0431\u043b\u0438\u0446\u0443 \u043a \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u043c\u0443 \u0437\u0430\u043f\u0440\u043e\u0441\u0443 \u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043b\u0438 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f, \u0445\u0440\u0430\u043d\u044f\u0449\u0438\u0435\u0441\u044f \u0432 \u043d\u0435\u0439, \u0432 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u043c \u0437\u0430\u043f\u0440\u043e\u0441\u0435.<\/p>\n\n\n\n<p>\u0422\u0435\u043f\u0435\u0440\u044c \u0434\u0430\u0432\u0430\u0439\u0442\u0435 \u0440\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u0441\u0438\u0442\u0443\u0430\u0446\u0438\u044e, \u043a\u043e\u0433\u0434\u0430 \u043d\u0430\u043c \u043d\u0430\u0434\u043e \u0432 \u043a\u043e\u043d\u0441\u0442\u0430\u043d\u0442\u0430\u0445 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f, \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u043d\u044b\u0435 \u0438\u0437 \u0434\u0440\u0443\u0433\u043e\u0433\u043e \u0437\u0430\u043f\u0440\u043e\u0441\u0430:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">WITH consts AS (SELECT <em>string_to_array<\/em>(value, ',') AS types\n                FROM some_settings\n                WHERE key = 'some_key')\nSELECT some_table.col1,\n<em>sum<\/em> ( CASE WHEN (some_other_table.col1)::TEXT = ANY (consts.types) THEN 0\n    ELSE some_table.qty END) AS cnt\nFROM consts,\n(some_table t1\n    JOIN some_other_table t2 ON t1.id = t2.some_id\n)      <\/pre>\n\n\n\n<p>\u0417\u0434\u0435\u0441\u044c \u043c\u044b \u043f\u0440\u0435\u0434\u0432\u0430\u0440\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u0437\u0430\u0431\u0438\u0440\u0430\u0435\u043c \u0441\u043f\u0438\u0441\u043e\u043a \u0442\u0438\u043f\u043e\u0432 (\u0441\u0442\u0440\u043e\u043a\u0430, \u0438\u0437 \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043c\u044b \u0434\u0435\u043b\u0430\u0435\u043c \u043c\u0430\u0441\u0441\u0438\u0432), \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u0432 \u0442\u0430\u0431\u043b\u0438\u0446\u0435 \u0441 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0430\u043c\u0438 <em>tbl_settings<\/em>, \u043f\u0440\u0438\u0441\u0432\u0430\u0438\u0432\u0430\u0435\u043c \u0435\u0433\u043e \u043a\u043e\u043d\u0441\u0442\u0430\u043d\u0442\u0435 <em>types<\/em>, \u0438 \u0434\u0430\u043b\u0435\u0435 \u0443\u0436\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c \u0435\u0451 \u0432 \u0440\u0430\u0441\u0447\u0451\u0442\u0430\u0445. <\/p>\n\n\n\n<p>\u041d\u0430\u043a\u043e\u043d\u0435\u0446, \u0432\u043e\u0442 \u043a\u0430\u043a \u043c\u043e\u0436\u043d\u043e \u043e\u0431\u0445\u043e\u0434\u0438\u0442\u044c\u0441\u044f \u0441 \u043f\u0430\u0440\u0430\u043c\u0438 \u043a\u043b\u044e\u0447-\u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043c\u044b \u0445\u043e\u0442\u0438\u043c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043a\u043e\u043d\u0441\u0442\u0430\u043d\u0442:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">WITH param_names AS (\n SELECT * FROM (VALUES ('norm_hour', '\u041d\u043e\u0440\u043c\u043e\u0447\u0430\u0441'), ('price', '\u0426\u0435\u043d\u0430')) AS t (param_key, param_name)\n)\nSELECT <em>coalesce <\/em>(param_names.param_name, '') AS param_to_show, some_table.param_value\nFROM some_table \nLEFT JOIN param_names \n    on some_table.param_key = param_names.param_key<\/pre>\n\n\n\n<p>\u0417\u0434\u0435\u0441\u044c \u043c\u044b \u0432 <em>param_names <\/em>\u0433\u043e\u0442\u043e\u0432\u0438\u043c \u043d\u0430\u0431\u043e\u0440\u044b \u043a\u043b\u044e\u0447-\u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0434\u043b\u044f \u0447\u0435\u043b\u043e\u0432\u0435\u043a\u043e\u043f\u043e\u043d\u044f\u0442\u043d\u044b\u0445 \u043d\u0430\u0437\u0432\u0430\u043d\u0438\u0439 \u043d\u0435\u043a\u0438\u0445 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u043e\u0432. <em>param_key <\/em>&#8212; \u044d\u0442\u043e \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b (\u0438\u0445 \u043a\u043b\u044e\u0447\u0438), \u0445\u0440\u0430\u043d\u0438\u043c\u044b\u0435 \u0432 <em>some_table<\/em>. \u0414\u0430\u043d\u043d\u044b\u0439 \u0437\u0430\u043f\u0440\u043e\u0441 \u0432\u044b\u0434\u0430\u0451\u0442 \u043f\u043e\u043d\u044f\u0442\u043d\u044b\u0435 \u0447\u0435\u043b\u043e\u0432\u0435\u043a\u0443 \u043d\u0430\u0437\u0432\u0430\u043d\u0438\u044f \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u043e\u0432 (\u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0435 \u0432 \u043a\u043e\u043d\u0441\u0442\u0430\u043d\u0442\u0435) \u0438 \u0438\u0445 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u0438\u0437 <em>some_table<\/em>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u041b\u044e\u0431\u0438\u0442\u0435 \u043b\u0438 \u0432\u044b &#171;\u043c\u0430\u0433\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0447\u0438\u0441\u043b\u0430&#187; \u0432 \u043a\u043e\u0434\u0435? \u0412\u0441\u0435 \u044d\u0442\u0438 if (a == 259)&#8230; \u041d\u0438\u043a\u0442\u043e \u0438\u0445 \u043d\u0435 \u043b\u044e\u0431\u0438\u0442. \u0418 SQL-\u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u044d\u0442\u043e \u043a\u0430\u0441\u0430\u0435\u0442\u0441\u044f \u0432 \u0442\u043e\u0439 \u0436\u0435 \u0441\u0442\u0435\u043f\u0435\u043d\u0438, \u043a\u0430\u043a \u0438 \u044f\u0437\u044b\u043a\u043e\u0432 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f. &#171;\u041c\u0430\u0433\u0438\u0447\u0435\u0441\u043a\u0438\u0435&#187; \u0447\u0438\u0441\u043b\u0430 \u0434\u0435\u043b\u0430\u044e\u0442 \u043a\u043e\u0434 \u043d\u0435\u0447\u0438\u0442\u0430\u0435\u043c\u044b\u043c, \u043b\u044e\u0431\u044b\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0432 \u043d\u0451\u043c \u0431\u0443\u0434\u0443\u0442 \u0433\u043e\u043b\u043e\u0432\u043d\u043e\u0439 \u0431\u043e\u043b\u044c\u044e, \u0438 \u043d\u0443\u0436\u043d\u043e \u0432\u0441\u0435\u0433\u0434\u0430 \u0438\u0437\u0431\u0435\u0433\u0430\u0442\u044c \u0438\u0445, \u0435\u0441\u043b\u0438 \u0435\u0441\u0442\u044c \u0442\u0430\u043a\u0430\u044f \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c. \u0418\u0442\u0430\u043a, \u0443 \u0432\u0430\u0441 \u0435\u0441\u0442\u044c \u043f\u043e\u0442\u0440\u0435\u0431\u043d\u043e\u0441\u0442\u044c&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[85],"tags":[87,88],"class_list":["post-1319","post","type-post","status-publish","format-standard","hentry","category-sql","tag-postgresql","tag-sql"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/langtoday.com\/index.php?rest_route=\/wp\/v2\/posts\/1319","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/langtoday.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/langtoday.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/langtoday.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/langtoday.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1319"}],"version-history":[{"count":5,"href":"https:\/\/langtoday.com\/index.php?rest_route=\/wp\/v2\/posts\/1319\/revisions"}],"predecessor-version":[{"id":1327,"href":"https:\/\/langtoday.com\/index.php?rest_route=\/wp\/v2\/posts\/1319\/revisions\/1327"}],"wp:attachment":[{"href":"https:\/\/langtoday.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1319"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/langtoday.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1319"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/langtoday.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1319"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}