How do I calculate two columns which has a allias name

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i have table with 3 columns.1st start_time, 2nd end_time,3rd units
when I write a query i use alias for a column but I am unable to use it afterward.
select start_time,end_time,units,datediff(minute,starttime,endtime) as minutes,(minutes/units) as rate from tblpunch

What I have tried:

i have tried the above query but it is not working

Posted 4-Jan-22 23:08pm

Member 15084650

Updated 4-Jan-22 23:49pm

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CHill60 5-Jan-22 5:38am

What are the three column names on your table - you are listing lots of names here and it is not clear which are aliases and which are columns

Member 15084650 5-Jan-22 5:42am

i have 3 coloums 1 start_time ,2 end_time ,3 units.

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CHill60 · Accepted Answer · 2022-01-04T23:49:00

Solution 2

You can't refer to aliases within the same select. Either use a Common Table Expression, a Sub-Query, Temporary table or Table Variable, or simply repeat the calculation.

SQL

select start_time,end_time,units,datediff(minute,start_time,end_time) as minutes,(datediff(minute,start_time,end_time)/units) as rate from tblpunch

Posted 4-Jan-22 23:49pm

CHill60

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Member 15084650 5-Jan-22 6:01am

THANK YOU