{"id":1872,"date":"2011-09-04T00:37:48","date_gmt":"2011-09-04T00:37:48","guid":{"rendered":"http:\/\/enjoyasp.net\/?p=1872"},"modified":"2011-09-04T00:37:48","modified_gmt":"2011-09-04T00:37:48","slug":"%e5%ae%9a%e4%b9%89%e4%bf%a1%e6%81%af%e6%9f%a5%e8%af%a2%e5%a6%82%e5%ad%98%e5%82%a8%e8%bf%87%e7%a8%8b%e5%8f%82%e6%95%b0-information_schema","status":"publish","type":"post","link":"https:\/\/enjoyasp.net\/index.php\/2011\/09\/04\/%e5%ae%9a%e4%b9%89%e4%bf%a1%e6%81%af%e6%9f%a5%e8%af%a2%e5%a6%82%e5%ad%98%e5%82%a8%e8%bf%87%e7%a8%8b%e5%8f%82%e6%95%b0-information_schema\/","title":{"rendered":"\u5b9a\u4e49\u4fe1\u606f\u67e5\u8be2\u5982\u5b58\u50a8\u8fc7\u7a0b\u53c2\u6570-INFORMATION_SCHEMA"},"content":{"rendered":"<pre escaped=\"true\" lang=\"tsql\">\r\n1, INFORMATION_SCHEMA.COLUMNS :\u5b58\u50a8\u5217\u5b9a\u4e49\uff0c\u5305\u542b\u5217\u7c7b\u578b\uff0c\u957f\u5ea6\u7b49\u4fe1\u606f\u3002\r\n2\uff0cINFORMATION_SCHEMA.PARAMETERS\uff1a\u5b58\u50a8\u8fc7\u7a0b\u53c2\u6570\u4fe1\u606f\u3002\r\n\u5982\uff1a\u67e5\u8be2\u884c\u957f\u5ea6\uff1a\r\nselect\r\nc.table_name,\r\ncount(*) columns,\r\nsum(\r\ncase data_type\r\nwhen 'binary' then character_maximum_length\r\nwhen 'varbinary' then character_maximum_length\r\nwhen 'char' then character_maximum_length\r\nwhen 'varchar' then character_maximum_length\r\nwhen 'nchar' then character_maximum_length\r\nwhen 'nvarchar' then character_maximum_length\r\nwhen 'bigint' then 8\r\nwhen 'int' then 4\r\nwhen 'uniqueidentifier' then 16\r\nwhen 'datetime' then 8\r\nwhen 'bit' then 1\r\nwhen 'image' then 16\r\nwhen 'text' then 16\r\nwhen 'ntext' then 16\r\nend) as avgLen\r\n from INFORMATION_SCHEMA.COLUMNS c join INFORMATION_SCHEMA.Tables t\r\nON c.Table_Schema=t.Table_Schema AND c.Table_Name=t.Table_Name\r\nWHERE t.TABLE_TYPE='BASE TABLE' AND c.TABLE_NAME NOT IN('dtproperties','sysdiagrams')\r\n--AND table_name like '%log'\r\ngroup by c.table_name\r\norder by avgLen desc\r\ngo<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>1, INFORMATION_SCHEMA.COLUMNS :\u5b58\u50a8\u5217\u5b9a\u4e49\uff0c\u5305\u542b\u5217\u7c7b\u578b\uff0c\u957f\u5ea6\u7b49\u4fe1\u606f\u3002 2\uff0cINF [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36],"tags":[],"class_list":["post-1872","post","type-post","status-publish","format-standard","hentry","category-sql-server"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/posts\/1872","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/comments?post=1872"}],"version-history":[{"count":0,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/posts\/1872\/revisions"}],"wp:attachment":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/media?parent=1872"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/categories?post=1872"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/tags?post=1872"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}