具有3个不同表的外键和主键的UPDATE设置表

Question

I have two different tables.

Department table

//Department
D#          DNAME
-------------------
1           SALES
2        ACCOUNTING
3          GAMES
5          SPORTS

Employee Table

//Employee
E#      D#
-----------
 1      3
 2      2
 3      5
 4      5

Now using Update statement , update the D#=5 to D#=3;

Currently using this statement

UPDATE EMPLOYEE SET D# = 3 WHERE D# = 5;

But then i trying to learn that if i don't want update using D#, but want to update using the DNAME which mean E# from SPORT will change to GAMES , what should i do to solve it.

Answer 1

You want the multi table update

Something along the lines of:

update employee e
  join department d using (d#)
   set e.d# = 3
 where d.dname = 'SPORTS'; 

sqlfiddle