Update only a row with a changed value in it

From: "Robertson Lee - lerobe" <Lee.Robertson@xxxxxxxxxx>
To: <oracle-l@xxxxxxxxxxxxx>
Date: Fri, 9 Dec 2011 17:15:01 -0000

Guys,
 

Got something I think I need a bit of a hand on.....

 

I have two tables, say, TableA and TableB J

 

Table A

----------

ID  varchar2(10),

DT_CONTACT date,

BUILD number

 

Table B

----------

ID varchar2(10),

DT_CONTACT date

 

I need to update Table A as follows

 

Update table A

Set dt_contact = least(a.dt_contact,b.dt_contact)

      Build = (select variable from another table where stage = 'BUILD')
- this step not key dependant

Where the individual id on tableA = the individual_id on table B

 

This only needs to occur if the date on table A is going to change and
also avoid the godawful returning more than one row thing

 

Does that all make sense. Its doing my head in.......

 

Hope someone can point me in the right direction and have a great
weekend.

 

Cheers

 

Lee

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Update only a row with a changed value in it

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