我有一个存储过程,该过程将table1A%yyyymm%通过复制旧表的结构来创建新表table1。但是在创建新表之前,我需要检查该表是否存在,如果存在,则需要先删除该表。这是我的存储过程。
table1A%yyyymm%
table1
DECLARE @yyyymm char(6) SET @yyyymm=CONVERT(nvarchar(6), GETDATE(), 112) DECLARE @tableName varchar(50) SET @tableName='table1A_' + @yyyymm DECLARE @SQL varchar(max) SET @SQL = 'DROP TABLE ' + @tableName IF EXISTS (SELECT * FROM sys.tables WHERE type='u' and name =@tableName) EXEC(@SQL) print (@sql) SET @SQL= 'SELECT TOP 0 * INTO ' + @tableName + ' FROM table1 with (nolock)' EXEC(@SQL)
但是,如果该表存在,我总是会收到类似以下的错误。哪里错了?
DROP TABLE table1A_201404 Msg 2714, Level 16, State 6, Line 1 There is already an object named 'table1A_201404' in the database.
让我感到难过…在这种情况下,“如果存在”似乎无法与exec配合使用。更新了以下脚本:
DECLARE @yyyymm char(6) SET @yyyymm=CONVERT(nvarchar(6), GETDATE(), 112) DECLARE @tableName varchar(50) SET @tableName='table1A_' + @yyyymm DECLARE @SQL varchar(max) SET @SQL = 'DROP TABLE ' + @tableName EXEC('IF EXISTS(SELECT * FROM sys.tables WHERE type=''u'' and name = N''' + @tablename + ''') DROP TABLE table1A_201404') SET @SQL= 'SELECT TOP 0 * INTO ' + @tableName + ' FROM sysobjects with (nolock)' EXEC(@SQL) print @SQL