DROPING ALL THE CONSTRAINTS ON A TABLE

-- T-SQL SCRIPTLET TO DROP ALL CONSTRAINTS ON A TABLE
DECLARE @database nvarchar(50)
DECLARE @table nvarchar(50)

set @database = 'TEST_DB'
set @table = 'TEST_TABLE'

DECLARE @sql nvarchar(255)
WHILE EXISTS(select * from INFORMATION_SCHEMA.TABLE_CONSTRAINTS where constraint_catalog = @database and table_name = @table)
BEGIN
    select    @sql = 'ALTER TABLE ' + @table + ' DROP CONSTRAINT ' + CONSTRAINT_NAME
    from    INFORMATION_SCHEMA.TABLE_CONSTRAINTS
    where    constraint_catalog = @database and
            table_name = @table
    exec    sp_executesql @sql
END

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