sql server 删除带默认值的字段

sql server 删除带默认值的字段

-- USE YOUR DB
-- alter table Library add cultureInfo2 varchar(20) default('zh-cn')

declare @tableName varchar(100)='Library'
declare @columnName varchar(100)='CultureInfo2'

declare @constraintName varchar(200)


select @constraintName=b.name from syscolumns a,sysobjects b where a.id=object_id(@tableName) 
and b.id=a.cdefault and a.name=@columnName and b.name like 'DF%'
--select @constraintName

exec('alter table '+@tableName+' drop constraint '+@constraintName)
exec ('alter table ' + @tableName + ' drop column ' + @columnName )