update and "if...else" clause?

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update and "if...else" clause?

Barkingdog

SSCoach

Points: 18670
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November 13, 2008 at 9:49 pm

#195798

I have 2 sql statements:
update t5
set updatefield = 0
from t5 inner join t6 on (t5.c1 = t6.d1)
and ( (t5.c2 =t6.c2) and (t5.c3 = t6.d3))
update t5
set updatefield = 1
from t5 inner join t6 on (t5.c1 = t6.d1)
and ( (t5.c2 <> t6.c2) or (t5.c3 <> t6.d3))
The inner join in the first update works on a certain set of values and the inner join in the second update works on the data missed by the first join.
Is there any way I can combine these two ststaments into one Join, one update?
TIA,
barkingdog

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Jeff Moden SSC Guru Points: 1004405 More actions · Answer 1

UPDATE t5

SET UpdateField = CASE

WHEN t5.c2 = t6.c2 AND t5.c3 = t6.d3

THEN 0

ELSE 1

END

FROM t5

INNER JOIN t6

ON t5.c1 = t6.d1

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)

Barkingdog SSCoach Points: 18670 More actions · Answer 2

Barkingdog

SSCoach

Points: 18670

November 14, 2008 at 12:35 am

#898430

Thank You Jeff.

Jeff Moden SSC Guru Points: 1004405 More actions · Answer 3

You bet... thank you for the feedback.

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)