Question

How to rewrite multiple subqueries as one statement

Asked by: SWRO

Hello, I have a query which involves multiple IN statements. I have tried rewriting this with Joins instead but to no avail. Any ideas?

FYI - recno is the equivalent of a table's id field (increment INT) and is the PK in the table while any other field with 'recno' in its title is a FK.

DELETE 
FROM content..z_fare_code_rates
WHERE sailingrecno IN 
	(
	select	recno 
	from 	content..sailings
	where 	shiprecno IN 
		(
		select	recno 
		from 	content..ships 
		where 	cruiselinerecno IN 
			(
			select	cruiselinerecno 
			from 	content..ships 
			where 	recno IN 
				(
				select	shiprecno 
				from 	working.dbo.z_pricing
				)
			)
		)
	)
AND farecode IN 
	(
	select	farecode
	from	working.dbo.z_pricing
	)

                                  
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Asked On
2008-03-14 at 15:30:20ID23243260
Tags

Microsoft

,

SQL Server

,

2000

,

T-SQL statement

Topics

MS SQL Server

,

Databases Miscellaneous

Participating Experts
2
Points
250
Comments
3

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Answers

 

by: angelIIIPosted on 2008-03-14 at 15:34:23ID: 21130182

do you want to just rewrite with JOIN, or is there a problem with the results of IN() ?

 

by: BriCrowePosted on 2008-03-14 at 16:04:44ID: 21130399

try this...

DELETE content..z_fare_code_rates
FROM content..z_fare_code_rates AS rates
INNER JOIN content..sailings AS sailings
   ON rates.sailingrecno = sailings.recno
INNER JOIN content..ships AS ships
   ON sailings.shiprecno = ships.recno
INNER JOIN working.dbo.z_pricing AS pricing
   ON ships.recno = pricing.shiprecno
   AND rates.farecode = pricing.farecode

I'm gonna go take some Advil now for the headache ;-)

 

by: SWROPosted on 2008-03-15 at 10:13:58ID: 21133440

angelIII: Nothing wrong with it, in fact it works fairly nicely. Just looking for something less involved for maintenance purposes.

BriCrowe: I will give that a shot and see what happens.

20120131-EE-VQP-002

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