I am facing a problem in executing queries with CASE statement. Based on my condition,(for eg. length), I want to execute different SQL statement.
Problematic sample query is as follows:
select case
when char_length('19480821') = 8
then select count(1) from Patient
when char_length('19480821')=10
then select count(1) from Doctor
end
Exception:
[Error] Script lines: 1-5 --------------------------
Incorrect syntax near the keyword 'select'.
Msg: 156, Level: 15, State: 2
Server: sunsrv4z7, Line: 2
I am not able to correct the syntax. I am getting the string for char_length as input from the user. How can I fire queries based on certain condition? Is CASE the right choice ? Or do I have to use any other thing.
Just put opening and closing bracket around select statement resolve you problem
select
case when
char_length('19480821')=8 then
(select count(1) from Patient )
when
char_length('19480821')=10 then
(select count(1) from Doctor )
end