Coalesce on inner queries

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Coalesce on inner queries

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Raghunath Garlapati

Posted Monday, January 25, 2010 12:00 AM

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Hi All,

I have a where condition like

where Fk_Event in
(COALESCE((select fk_event from workscope_event where Fk_user=@userId),Fk_Event)))

actually my requirement is ..if the user is having event it should get only those events other wise all the events.

here the problem is i may get more than one fk_event from inner query , please tell me how can i solve this...Please try to avoid if else statements coz already my query is depending on so many conditions.

/********************************************************
Technology is just a tool,in terms of getting the kids working together and motivating them,the teacher is the most important.
********************************************************/

Post #852853

GilaMonster

Posted Monday, January 25, 2010 12:07 AM

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Please post table definitions, sample data and desired output. Read this to see the best way to post this to get quick responses.
http://www.sqlservercentral.com/articles/Best+Practices/61537/

If may also be worth reading http://sqlinthewild.co.za/index.php/2009/03/19/catch-all-queries/ and http://sqlinthewild.co.za/index.php/2009/09/15/multiple-execution-paths/

Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass

Post #852855

Raghunath Garlapati

Posted Monday, January 25, 2010 12:31 AM

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Last Login: Thursday, February 28, 2013 10:51 PM
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Hi,

I have a table workscope_event where i will be having event id and user id mappings,

say for user id --> 1 mapped to events 1,2,3 where i have total 10 events

now i need a query such that if user with Id 1 login to the system it should show only 1,2,3 events but if user with other id logs into the system it shud give all the 10 events.

so as i told from workscope_events i will get mappings of user and event where i need to filter from event table with those events of workwscope_events depending on user login.

/********************************************************
Technology is just a tool,in terms of getting the kids working together and motivating them,the teacher is the most important.
********************************************************/

Post #852864

GilaMonster

Posted Monday, January 25, 2010 12:38 AM

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I'm assuming you didn't read that article. Table definitions, sample data and desired output please.

Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass

Post #852865

Raghunath Garlapati

Posted Monday, January 25, 2010 12:57 AM

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k my tables are

package_event (Id int,name nvarchar(50),fk_event int)
workscope_event (fk_user int,fk_event int)

data : Package_Event

Fk_Package, Fk_Event
1 1
2 2
3 3
4 4
5 5
6 6
6 1

data : workscope_event

Fk_User, Fk_Event
1 1
1 2
1 3

now if the user 1 logs in then the out put should be

Fk_Event , Fk_Package
1 1
2 2
3 3

for other users all the events and their packages should come.

/********************************************************
Technology is just a tool,in terms of getting the kids working together and motivating them,the teacher is the most important.
********************************************************/

Post #852868

GilaMonster

Posted Monday, January 25, 2010 1:06 AM

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I'm assuming you didn't read that article.

Ok, so based on that sample data, what do you want the query to return. (actual values please, not a description)

Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass

Post #852869

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