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For each table with the FK: This takes a bit of effort, but would result in your constraint being properly set for your case.

# EDIT 2 : In order to script out creation or dropping of all foreign keys in your schema run the following script (taken from here) DECLARE @schema_name sysname; DECLARE @table_name sysname; DECLARE @constraint_name sysname; DECLARE @constraint_object_id int; DECLARE @referenced_object_name sysname; DECLARE @is_disabled bit; DECLARE @is_not_for_replication bit; DECLARE @is_not_trusted bit; DECLARE @delete_referential_action tinyint; DECLARE @update_referential_action tinyint; DECLARE @tsql nvarchar(4000); DECLARE @tsql2 nvarchar(4000); DECLARE @fk Col sysname; DECLARE @pk Col sysname; DECLARE @col1 bit; DECLARE @action char(6); DECLARE @referenced_schema_name sysname; DECLARE FKcursor CURSOR FOR select OBJECT_SCHEMA_NAME(parent_object_id) , OBJECT_NAME(parent_object_id), name, OBJECT_NAME(referenced_object_id) , object_id , is_disabled, is_not_for_replication, is_not_trusted , delete_referential_action, update_referential_action, OBJECT_SCHEMA_NAME(referenced_object_id) from sys.foreign_keys order by 1,2; OPEN FKcursor; FETCH NEXT FROM FKcursor INTO @schema_name, @table_name, @constraint_name , @referenced_object_name, @constraint_object_id , @is_disabled, @is_not_for_replication, @is_not_trusted , @delete_referential_action, @update_referential_action, @referenced_schema_name; WHILE @@FETCH_STATUS = 0 BEGIN IF @action 'CREATE' SET @tsql = 'ALTER TABLE ' QUOTENAME(@schema_name) '.' QUOTENAME(@table_name) ' DROP CONSTRAINT ' QUOTENAME(@constraint_name) ';'; ELSE BEGIN SET @tsql = 'ALTER TABLE ' QUOTENAME(@schema_name) '.' QUOTENAME(@table_name) CASE @is_not_trusted WHEN 0 THEN ' WITH CHECK ' ELSE ' WITH NOCHECK ' END ' ADD CONSTRAINT ' QUOTENAME(@constraint_name) ' FOREIGN KEY ('; SET @tsql2 = ''; DECLARE Column Cursor CURSOR FOR select COL_NAME(fk.parent_object_id, fkc.parent_column_id) , COL_NAME(fk.referenced_object_id, fkc.referenced_column_id) from sys.foreign_keys fk inner join sys.foreign_key_columns fkc on fk.object_id = fkc.constraint_object_id where fkc.constraint_object_id = @constraint_object_id order by fkc.constraint_column_id; OPEN Column Cursor; SET @col1 = 1; FETCH NEXT FROM Column Cursor INTO @fk Col, @pk Col; WHILE @@FETCH_STATUS = 0 BEGIN IF (@col1 = 1) SET @col1 = 0; ELSE BEGIN SET @tsql = @tsql ','; SET @tsql2 = @tsql2 ','; END; SET @tsql = @tsql QUOTENAME(@fk Col); SET @tsql2 = @tsql2 QUOTENAME(@pk Col); FETCH NEXT FROM Column Cursor INTO @fk Col, @pk Col; END; CLOSE Column Cursor; DEALLOCATE Column Cursor; SET @tsql = @tsql ' ) REFERENCES ' QUOTENAME(@referenced_schema_name) '.' QUOTENAME(@referenced_object_name) ' (' @tsql2 ')'; SET @tsql = @tsql ' ON UPDATE ' CASE @update_referential_action WHEN 0 THEN 'NO ACTION ' WHEN 1 THEN 'CASCADE ' WHEN 2 THEN 'SET NULL ' ELSE 'SET DEFAULT ' END ' ON DELETE ' CASE @delete_referential_action WHEN 0 THEN 'NO ACTION ' WHEN 1 THEN 'CASCADE ' WHEN 2 THEN 'SET NULL ' ELSE 'SET DEFAULT ' END CASE @is_not_for_replication WHEN 1 THEN ' NOT FOR REPLICATION ' ELSE '' END ';'; END; PRINT @tsql; IF @action = 'CREATE' BEGIN SET @tsql = 'ALTER TABLE ' QUOTENAME(@schema_name) '.' QUOTENAME(@table_name) CASE @is_disabled WHEN 0 THEN ' CHECK ' ELSE ' NOCHECK ' END 'CONSTRAINT ' QUOTENAME(@constraint_name) ';'; PRINT @tsql; END; FETCH NEXT FROM FKcursor INTO @schema_name, @table_name, @constraint_name , @referenced_object_name, @constraint_object_id , @is_disabled, @is_not_for_replication, @is_not_trusted , @delete_referential_action, @update_referential_action, @referenced_schema_name; END; CLOSE FKcursor; DEALLOCATE FKcursor; constraint, but you want to have that set up, it is a bit of work.row *************************** Table: ibtest11c Create Table: CREATE TABLE `ibtest11c` ( `A` int(11) NOT NULL auto_increment, `D` int(11) NOT NULL default '0', `B` varchar(200) NOT NULL default '', `C` varchar(175) default NULL, PRIMARY KEY (`A`,`D`,`B`), KEY `B` (`B`,`C`), KEY `C` (`C`), CONSTRAINT `0_38775` FOREIGN KEY (`A`, `D`) REFERENCES `ibtest11a` (`A`, `D`) ON DELETE CASCADE ON UPDATE CASCADE, CONSTRAINT `0_38776` FOREIGN KEY (`B`, `C`) REFERENCES `ibtest11a` (`B`, `C`) ON DELETE CASCADE ON UPDATE CASCADE ) ENGINE=INNODB CHARSET=latin1 1 row in set (0.01 sec) mysql.When you drop a table, any constraints that were defined in the statement used to create that table are also dropped.This index also permits fast access to data when the primary key is used in queries.If a primary key constraint is defined on more than one column, values may be duplicated within one column, but each combination of values from all the columns in the primary key constraint definition must be unique.

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