Re: SQL: UPDATE question

[Pete Hall <pbhall@xxxxxxxxxx>]

At 15:20 06/07/2001, Mike Naughton wrote:
>I suspect this may be very simple, but I've been beating my head trying to
>figure it out.
>
>I have two tables:
>Table1 has key fields KeyOneA and KeyOneB, and two other fields fldOneC
>and fldOneD
>Table2 also has key fields KeyTwoA and KeyTwoB, and two other fields
>fldTwoE and fldTwoF
>
>For each record in Table1 where KeyOneA=KeyTwoA and KeyOneB=KeyTwoB, I
>want to set fldOneC=fldTwoE and fldOneD=fldTwoF.


You could use subqueries:

  UPDATE Table1 SET
    fldOneC = (SELECT fldTwoE FROM Table2
               WHERE KeyTwoA = KeyOneA
                 AND KeyTwoB = KeyOneB)
    fldOneD = (SELECT fldTwoF FROM Table2
               WHERE KeyTwoA = KeyOneA
                 AND KeyTwoB = KeyOneB)


Pete Hall
pbhall@execpc.com
http://www.execpc.com/~pbhall/

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