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Tip of the Day
Language:
Expertise: Beginner
Dec 15, 2001

WEBINAR:

On-Demand

Building the Right Environment to Support AI, Machine Learning and Deep Learning


Conditional Sorting in T-SQL


There may be certain situations where you have to sort character-based columns in a particular order.

For example, Let us consider a table:
 
--///////////////////////////////////

SID	Subject		Marks
---	------		-----
1	Physics		80
1	Chemistry	75
1	Maths		90
1	Biology		70
2	Physics		65
2	Chemistry	70
2	Maths		80
2	Biology		60
--///////////////////////////////////

Now you are asked to query a table in such a manner that Maths should come first, Physics second, Chemistry third, and Biology last for each StudentID.

To accomplish this, use T-SQL "Case" statement:
 
--///////////////////////////////////
select tblMarks.*
from tblMarks  order by SID,
	(case Subject
		when 'Maths' then 1
		when 'Physics' then 2
		when 'Chemistry' then 3
		when 'Biology' then 4
		end ) asc


SID	Subject		Marks
---	------		-----
1	Maths		90
1	Physics		80
1	Chemistry	75
1	Biology		70
2	Maths		80
2	Physics		65
2	Chemistry	70
2	Biology		60

--///////////////////////////////////
Harinatha Reddy
 
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