{"id":52,"date":"2018-06-06T18:23:35","date_gmt":"2018-06-06T18:23:35","guid":{"rendered":"http:\/\/mein-it-wissen.net\/?p=52"},"modified":"2018-06-27T12:08:17","modified_gmt":"2018-06-27T12:08:17","slug":"co-related-subqueries-vermeiden","status":"publish","type":"post","link":"https:\/\/mein-it-wissen.net\/?p=52","title":{"rendered":"Co-related Subqueries vermeiden"},"content":{"rendered":"<p>Schlecht ist es mit einer sub-query mehrfach auf die gleiche Tabelle zuzugreifen, z.B.:<\/p>\n<p>select * from auftrag<\/p>\n<p>where auftrag_amt = (select max(auftrag_amt) from auftrag)<\/p>\n<p>Besser ist die Verwendung einer inline view:<\/p>\n<p>select * from auftrag a1, (select max(a2.auftrag_amt) auftrag_amt from auftrag a2<\/p>\n<p>where a1.auftrag_amt = a2.auftrag_amt<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Schlecht ist es mit einer sub-query mehrfach auf die gleiche Tabelle zuzugreifen, z.B.: select * from auftrag where auftrag_amt = (select max(auftrag_amt) from auftrag) Besser ist die Verwendung einer inline view: select * from auftrag &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,3],"tags":[],"class_list":["post-52","post","type-post","status-publish","format-standard","hentry","category-oracle","category-sql"],"_links":{"self":[{"href":"https:\/\/mein-it-wissen.net\/index.php?rest_route=\/wp\/v2\/posts\/52","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mein-it-wissen.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mein-it-wissen.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mein-it-wissen.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mein-it-wissen.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=52"}],"version-history":[{"count":2,"href":"https:\/\/mein-it-wissen.net\/index.php?rest_route=\/wp\/v2\/posts\/52\/revisions"}],"predecessor-version":[{"id":68,"href":"https:\/\/mein-it-wissen.net\/index.php?rest_route=\/wp\/v2\/posts\/52\/revisions\/68"}],"wp:attachment":[{"href":"https:\/\/mein-it-wissen.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=52"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mein-it-wissen.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=52"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mein-it-wissen.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=52"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}