how do handle more than 1 rows , in case statement

Question

1.00/5 (1 vote)

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SQL

Select E.KeyBatchClass,
(Case When E.InternalTest='False' Then (Select BC.ClassName from BachClasses BC where B.Key_Batch=BC.Key_Batch)
When E.InternalTest='True' Then (Select BC.ClassName from BachClasses BC where B.Key_Batch=7) --My this line returns more than 1 rows and i need the same, result. i.e want multiple rows When E.InteralTest=True
End) as Batch_Class
from Exam E,Batch B
where E.keyBatch=B.key_Batch
and E.KeyExam=3
and E.keyBatch=7

Error Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.

Posted 10-Nov-14 2:40am

Abdullah Kundi

Updated 10-Nov-14 2:49am

v2

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Shweta N Mishra · Answer 1 · 2014-11-10T02:53:00

Solution 1

Check this

SQL

Select 
		E.KeyBatchClass,
        BC.ClassName as Batch_Class
from Exam E
Join Batch B On E.keyBatch=B.key_Batch
JOIN BachClasses On B.Key_Batch=
        (Case When E.InternalTest='False' Then BC.Key_Batch else 7 end)
where 
	E.KeyExam=3 and E.keyBatch=7

Posted 10-Nov-14 2:53am

Shweta N Mishra