{"id":51,"date":"2011-01-31T06:47:53","date_gmt":"2011-01-31T06:47:53","guid":{"rendered":"http:\/\/www.tinone71.com\/wordpress\/?p=19"},"modified":"2011-01-31T06:47:53","modified_gmt":"2011-01-31T06:47:53","slug":"sql-copiare-una-tabella","status":"publish","type":"post","link":"https:\/\/www.tinone71.com\/wp\/?p=51","title":{"rendered":"SQL copiare una tabella"},"content":{"rendered":"<div style=\"\" class=\"ssag-opads-main     \" ><\/div><p><font face=\"Cambria\" size=\"2\"><\/p>\n<p>Questa \u00e8 la sintassi SQL per mysql per eseguire una copia della sola struttura di una tabella,<\/p>\n<p>come riportata sul\u00a0<a title=\"Mysql Reference Manual\" href=\"http:\/\/dev.mysql.com\/doc\/refman\/5.0\/en\/create-table.html\">Mysql Reference Manual<\/a>.<\/p>\n<div>CREATE\u00a0[TEMPORARY]\u00a0TABLE\u00a0[IF\u00a0NOT\u00a0EXISTS]\u00a0tbl_name<br \/>\n{\u00a0LIKE\u00a0old_tbl_name\u00a0|\u00a0(LIKE\u00a0old_tbl_name)\u00a0}<\/div>\n<p>Quindi, non solo si pu\u00f2 creare una tabella strutturalmente identica ad un&#8217;altra, ma si pu\u00f2 anche impedire di sollevare un&#8217;eccezione se questa esiste gi\u00e0! Quindi questa \u00e8 l&#8217;istruzione-bacchetta magica!<\/p>\n<div>CREATE\u00a0TABLE\u00a0IF\u00a0NOT\u00a0EXISTS\u00a0temporanea\u00a0LIKE\u00a0originale<\/div>\n<p>Fare lo stesso in SQL Server non \u00e8 impossibile, \u00e8 solo un po&#8217; pi\u00f9 complicato:<\/p>\n<div>IF\u00a0NOT\u00a0EXISTS\u00a0(SELECT\u00a0*\u00a0FROM\u00a0dbo.sysobjects\u00a0WHERE\u00a0id\u00a0=\u00a0object_id(N'[dbo].[temporanea\u00a0]&#8217;)\u00a0AND\u00a0OBJECTPROPERTY(id,\u00a0N&#8217;IsUserTable&#8217;)\u00a0=\u00a01)<br \/>\nSELECT\u00a0TOP\u00a00\u00a0*\u00a0INTO\u00a0temporanea\u00a0FROM\u00a0originale<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Questa \u00e8 la sintassi SQL per mysql per eseguire una copia della sola struttura di una tabella, come<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[3],"tags":[],"_links":{"self":[{"href":"https:\/\/www.tinone71.com\/wp\/index.php?rest_route=\/wp\/v2\/posts\/51"}],"collection":[{"href":"https:\/\/www.tinone71.com\/wp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tinone71.com\/wp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tinone71.com\/wp\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tinone71.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=51"}],"version-history":[{"count":0,"href":"https:\/\/www.tinone71.com\/wp\/index.php?rest_route=\/wp\/v2\/posts\/51\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.tinone71.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=51"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tinone71.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=51"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tinone71.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=51"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}