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[数据库]sql server 判断及增加列的默认值约束


IF NOT EXISTS ( SELECT name FROM sysobjects WHERE id = ( SELECT syscolumns.cdefault FROM sysobjects   INNER JOIN syscolumns ON sysobjects.Id=syscolumns.Id   WHERE sysobjects.name=N'tableName' AND syscolumns.name=N'columnName' ) )BEGIN    ALTER TABLE tableName add constraint DF_columnName DEFAULT N'N' for columnName;   PRINT N'New add DF_columnName';ENDELSEBEGIN  PRINT N'DEFAULT FOR columnName HAD EXISTS';END