Is including the user defined columns in groupby clause is incorrect ?

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SQL-Server-2012

Hi All
Please help me in clarifying about the Group By Clause a little bit more.I tried to use an additional (User defined col) in my Group By clause, which is not present as original column in the Group by, However its ending up with error again:(!!

What I have tried:

The Query:

select CustName,Count(CustName),PurchaseDate,DATENAME(dw,PurchaseDate) as Day from [CustmrSrc] where Day = 'Monday' and Day ='Tuesday' and  Day='Wednesday' and Day='Thursday'and Day='Friday' Group By CustName, PurchaseDate ,Day

Error:-

Msg 207, Level 16, State 1, Line 1
Invalid column name 'Day'.
Msg 207, Level 16, State 1, Line 1
Invalid column name 'Day'.
Msg 207, Level 16, State 1, Line 1
Invalid column name 'Day'.
Msg 207, Level 16, State 1, Line 1
Invalid column name 'Day'.
Msg 207, Level 16, State 1, Line 1
Invalid column name 'Day'.
Msg 207, Level 16, State 1, Line 1
Invalid column name 'Day'.

Regards

Posted 21-Aug-16 21:50pm

mousau

Updated 21-Aug-16 22:30pm

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2 solutions

Solution 2

You pass the expression you want to group by rather than the alias
Like below

SQL

select CustName,Count(CustName),PurchaseDate,DATENAME(dw,PurchaseDate) as Day from [CustmrSrc] A

where DATENAME(dw,PurchaseDate) = 'Monday' or DATENAME(dw,PurchaseDate) ='Tuesday' or  DATENAME(dw,PurchaseDate)='Wednesday' or DATENAME(dw,PurchaseDate)='Thursday'or DATENAME(dw,PurchaseDate)='Friday'

Group By CustName, PurchaseDate ,DATENAME(dw,PurchaseDate)

Posted 21-Aug-16 22:30pm

Anisuzzaman Sumon

Comments

mousau 22-Aug-16 4:47am

Hi Sumon
Thanks a lot for the response.
Regards

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phil.o · Accepted Answer · 2016-08-21T22:15:00

You can include a user-defined column in your WHERE and GROUP BY clauses, but you have to use the full declaration instead of the name.
Applied to your example, this would give:

SQL

SELECT
  CustName
 ,Count(CustName)
 ,PurchaseDate
 ,DATENAME(dw,PurchaseDate) as Day
FROM
 [CustmrSrc]
WHERE
    DATENAME(dw,PurchaseDate) = 'Monday'
 OR DATENAME(dw,PurchaseDate) = 'Tuesday'
 OR DATENAME(dw,PurchaseDate) = 'Wednesday'
 OR DATENAME(dw,PurchaseDate) = 'Thursday'
 OR DATENAME(dw,PurchaseDate) = 'Friday'
GROUP BY
  CustName
 ,PurchaseDate

A few notes:
- Here you need OR conditions, not AND. A given date cannot be a monday and a tuesday at the same time.
- Since you already included the PurchaseDate column in the GROUP BY clause, you do not need to also include the day name (the PurchaseDate already defines the week-day).

Kindly.