更新一个表中的主键，这是另一表中的外键

Question

I have a table that it's primary key is foreign key in 5 tables.I need to change the value of this primary key field.what's the query?

             Table1 >> fields: tbl1ID(pk, bigint),  Desc(nvarchar(50))
             Table2 >> fields: tbl2ID(pk, bigint),tbl1ID(fk, bigint),  Desc(nvarchar(50))
             Table3 >>....
             .
             .
             .

I've set tbl1ID=1 and now i need to change it like this tbl1ID=100001, but i cant because this field is related to another table.

is it possible to change all of them?

Answer 1

You can do this simply by temporarily setting foreign_key_checks=0 in your session.

SET FOREIGN_KEY_CHECKS = 0;
UPDATE TABLE_A INNER JOIN TABLE_B ON TABLE_B.PKID = TABLE_A.PKID 
SET TABLE_B.PKID = 'NEW_VALUE', TABLE_A.PKID = 'NEW_VALUE'
WHERE TABLE_A.PKID = 'OLD_VALUE';

Another option is to configure the foreign key with the ON UPDATE CASCADE option so that if the primary key is updated on the parent table it will cascade to the child table