Question

join question

Asked by: sabev


I have an complex join that performs an update -

Update t3
set t3.zone = t1.zone
from t3
join t2
on t3.id = t2.id
join t1
 on t2.serial = t1.serial

How would I write this as a simple select statement so that I can tell how many records are affected.  I would also like to include a condition where t3.zone is null in both the update and select statements.

Thanks

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Asked On
2009-08-26 at 07:41:55ID24683394
Topic

SQL Query Syntax

Participating Experts
4
Points
200
Comments
12

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Answers

 

by: DanielWilsonPosted on 2009-08-26 at 07:44:34ID: 25188203

select count(*)

from t3
join t2
on t3.id = t2.id
join t1
on t2.serial = t1.serial

 

by: DanielWilsonPosted on 2009-08-26 at 07:45:12ID: 25188210

With such a query, I will often comment out the UPDATE ... SET ... section and replace with a SELECT for debugging purposes.

 

by: YZlatPosted on 2009-08-26 at 07:47:17ID: 25188240

SELECT * FROM t3
INNER join t2
on t3.id = t2.id
INNER join t1
 on t2.serial = t1.serial

 

by: shru_0409Posted on 2009-08-26 at 07:53:26ID: 25188315

Update t3
set t3.zone = (select t1.zone from t1 inner join t2 on t2.serial = t1.serial
t3 inner join t2 on t3.id = t2.id)
where t3.zone is null

try this

 

by: sabevPosted on 2009-08-26 at 08:31:48ID: 25188793

They all look good.  I need to do some testing and then split up the points.  I'll be back, thanks.

 

by: awking00Posted on 2009-08-26 at 08:33:09ID: 25188808

Are you saying you only want to update t3.zone if it is null?

 

by: awking00Posted on 2009-08-26 at 08:40:30ID: 25188910

See attached.

  • query.txt
    • 678 bytes

    Update and count queries.

 

by: sabevPosted on 2009-08-26 at 08:53:01ID: 25189084

Yes, update if null.  I think shru_0409 covered that.

Thanks

 

by: awking00Posted on 2009-08-26 at 09:20:27ID: 25189449

Sorry, I got my tables mixed up. Try again.

 

by: sabevPosted on 2009-08-26 at 09:25:11ID: 25189500


To extend the question a little.  I would like to add the distinct keyword thus -

SELECT distinct t3.id FROM t3
INNER join t2
on t3.id = t2.id
INNER join t1
 on t2.serial = t1.serial

but I get the error - The multi-part identifier "t3.id" could not be bound.

It works fine with just a select *

 

by: sabevPosted on 2009-08-26 at 10:25:33ID: 25190061

OK I got the distinct.  I also had to have t3.id in the select statement.

 

by: sabevPosted on 2009-08-26 at 10:27:53ID: 31620715

Hope this is fair.  I feel you all helped, and answered pretty much at the same time.

Thanks again

20120131-EE-VQP-002

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