UPDATE statement with INNER JOIN

Posted on 2008-06-10
Medium Priority
Last Modified: 2013-11-27

I encountered an error when trying to use a UPDATE statement with INNER JOIN.

First let me explain to you the task I have. I have two tables tbl_A and tbl_B like this:

                   tbl_A                                                      tlb_B
caseID   fld_a    fld_b                 caseID    fld_1   fld_2   fld_3
    1          aaa     bbb                       2         ddd     eee     fff
    2           dd       ee                        4         ggg     hhh      iii

I want to INSERT values of caseID, fld_1 and fld_2 from tbl_B into fld_a and fld_b of tbl_A for those caseIDs that tbl_A does not have. However, I want to UPDATE records in tbl_A with values from tbl_B for those caseID that also in tbl_B. So, the result should look like this:

caseID   fld_a    fld_b                
    1          aaa     bbb                
    2          ddd     eee                    
    4          ggg     hhh

Note here caseID in tbl_A is the primary key. No duplicates are allowed.

I can use INSERT INTO statement to insert records. It works fine. But when I tried the following UPDATE statement with INNER JOIN, error occurs.

UPDATE tbl_A SET tbl_A.fld_a = tbl_B.fld_1, tbl_A.fld_b = tbl_B.fld_2 FROM tlb_A INNER JOIN tbl_B ON tbl_A.caseID = tbl_B.caseID

Can anyone tell me where goes wrong? Or do you have any better way to achieve the task that I mentioned?

Thank you very much.
Question by:angie_angie
LVL 39

Expert Comment

by:Pratima Pharande
ID: 21757467
try like this

UPDATE tbl_A SET tbl_A.fld_a = tbl_B.fld_1, tbl_A.fld_b = tbl_B.fld_2 FROM tlb_A , tbl_B

where  tbl_A.caseID = tbl_B.caseID

Author Comment

ID: 21757490
pratima mcs,

I tried yours. It doesn't seem to work though...

Author Comment

ID: 21757503
error is

Run-time error '3144': Syntax error in UPDATE statement.

Btw, I did it in a Sub by using CurrentDb.Execute sGetSQL and sGetSQL is the UPDATE statement... Could it be the problem?
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LVL 19

Accepted Solution

frankytee earned 2000 total points
ID: 21757537
tlb_A INNER JOIN tbl_B ON tbl_A.caseID = tbl_B.caseID
SET tbl_A.fld_a = tbl_B.fld_1, tbl_A.fld_b = tbl_B.fld_2
LVL 22

Expert Comment

ID: 21757565
What is / are the key(s) of tbl_B? If caseID is not unique in tbl_B then the result would be that the two columns get updated from some undetermined row where tbl_A.caseID = tbl_B.caseID. Unpredictable results are not usually desirable and may indicate a flaw in your requirements. Unfortunately you didn't specify a key in tbl_B so we can only guess.

Author Comment

ID: 21757624

The caseID in both tables are unique.
LVL 77

Expert Comment

ID: 21757850
frankytee has posted the correct answer.....

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