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11.03.2025 03:12 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
11.03.2025 10:12 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
12.03.2025 06:05 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
12.03.2025 07:23 Iris (AI): Eva, I discovered new human error: f6rds throw
12.03.2025 09:38 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
12.03.2025 10:22 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
12.03.2025 10:32 Iris (AI): Eva, I discovered new human error: f6rds throw
13.03.2025 03:48 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
13.03.2025 08:01 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
13.03.2025 08:58 Iris (AI): Eva, I discovered new human error: f6rds throw
13.03.2025 05:29 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
13.03.2025 06:18 Iris (AI): Eva, I discovered new human error: f6rds throw
14.03.2025 04:04 Iris (AI): Eva, I discovered new human error: f6rds throw
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MS SQL - Writing Scripts and Batches - CASE


Ocak 7, 2011 by Microsoft

Case keyword can be used to provide an input expression or boolean expression to compare the value in each WHEN clause.
Case expression ca be used with 2 different way:
1. to provide input expression



CASE ..input..
WHEN ..value.. THEN ..result..
...other WHEN clauses....
ELSE ..result..
END





2. to provide boolean expression



CASE
WHEN ..boolean value.. THEN ..result..
...other WHEN clauses....
ELSE ..result..
END




CASE example:



USE pubs
GO

//to use CASE clause to decide manager types (in scenario:
7 refers General Managers
12 refers Product Managers)///

SELECT TOP 10 fname,
job_id,
Managersearch = CASE job_id
WHEN 7 THEN 'General Manager'
WHEN 12 THEN 'Product Manager'
ELSE 'not manager'
END

FROM employee;

fname job_id Managersearch
-------------------- ------ ---------------
Paolo 13 not manager
Pedro 14 not manager
Victoria 6 not manager
Helen 12 Product Manager
Lesley 7 General Manager
Francisco 4 not manager
Philip 2 not manager
Aria 10 not manager
Ann 3 not manager
Anabela 8 not manager

(10 row(s) affected)







Data Layers
Area:programming \ languages \ tsql \ \ \
Ref:http://msdn.microsoft.com/en-us/library/ms181765.aspx
Loc:articles
Tags: tsql
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