Question

Let’s say.. I have two statements

select min(Log_In_Time) from tbl where (event_ID=4)
select max(Log_Off_Time) from tbl where (event_ID=5)

How can I combine that 2 statement into one select statement which is resulted in 2 column like..

select min(Log_In_Time), max(Log_Off_Time) from tbl where ???????????????????

Answer 1

You can do this with a CASE statement:

Select 
MIN (case when event_ID = 4 then Log_In_Time else null end) as MinTime,
MAX (case when event_ID = 5 then Log_Off_Time else null end) as MaxTime
from tbl