How to drop all Foreign Key constraints in all tables?

Question

I want to write sql command to drop all constraints in all tables. I searched on the internet and found the following which works fine if the database is small and not compl

Answer 1

Most simple variant:

DECLARE @sql nvarchar(MAX) 
SET @sql = N'' 

SELECT @sql = @sql + N'ALTER TABLE ' + QUOTENAME(KCU1.TABLE_SCHEMA) 
    + N'.' + QUOTENAME(KCU1.TABLE_NAME) 
    + N' DROP CONSTRAINT ' -- + QUOTENAME(rc.CONSTRAINT_SCHEMA)  + N'.'  -- not in MS-SQL
    + QUOTENAME(rc.CONSTRAINT_NAME) + N'; ' + CHAR(13) + CHAR(10) 
FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS AS RC 

INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE AS KCU1 
    ON KCU1.CONSTRAINT_CATALOG = RC.CONSTRAINT_CATALOG  
    AND KCU1.CONSTRAINT_SCHEMA = RC.CONSTRAINT_SCHEMA 
    AND KCU1.CONSTRAINT_NAME = RC.CONSTRAINT_NAME 


-- PRINT @sql 
EXECUTE(@sql)