更新SQL

SQL

+
+---系统工具
+--查询当前数据库中所有表名 xtype='U':表示所有用户表，xtype='S':表示所有系统表。
+SELECT * FROM sysobjects WHERE xtype = 'U';
+SELECT * FROM sysobjects WHERE xtype = 'S';
+
+--查询指定表中的所有字段名 id 等于 sysobjects的ID
+SELECT * FROM syscolumns WHERE Id = '107141';
+
+--查询数据库中所有的表名及行数 
+SELECT a.name, b.rows 
+FROM sysobjects AS a 
+INNER JOIN sysindexes AS b ON a.id = b.id 
+WHERE (a.type = 'u') AND (b.indid IN (0, 1)) 
+ORDER BY a.name,b.rows DESC 
+
+--查询所有的标明及空间占用量\行数 
+select 
+object_name(id) tablename, 
+8*reserved/1024 reserved, 
+rtrim(8*dpages)+'kb' used, 
+8*(reserved-dpages)/1024 unused, 
+8*dpages/1024-rows/1024*minlen/1024 free, 
+rows
+from sysindexes 
+where indid=1 
+ORDER BY used DESC
+--order by used,tablename,reserved desc