Switch CASE
is the special scalar expression or conditional statement in the SQL language
which returns a single value based on the evaluation of a statement.
Here I am
taking an example to find the today date
select case DATEPART(dw,GETDATE())
when
1 then 'Sunday'
when 2 then 'Monday'
when 3 then 'Tuesday'
when 4 then 'Wednesday'
when 5 then 'Thursday'
when 6 then 'Friday'
when 7 then 'Saturday'
else 'AN'
END
as Today
|
Suppose here we have seven cases. If it
is long then it will be the tedious task. We have alternative for that to
create the derive table.
select x.[Today]
from
( values (1,'Sunday'),
(2,'Monday'),
(3,'Tuesday'),
(4,'Wednesday'),
(5,'Thursday'),
(6,'Friday'),
(7,'Saturday')
)x(ID,Today)
where x.ID=
(DATEPART(dw,GETDATE()))
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