How to compute I column that data is from other table?

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SQL-Server-2014

I have a 2 tables the tblPayment that have a column of 'Payment'; and the tblMonthlyReports having a column of 'Gross'.
I am trying to sum all the payments in column Payment in tblPayment the result will be display in Gross column in tblMonthlyReports. But I got an error saying

Msg 147, Level 15, State 1, Line 12
An aggregate may not appear in the WHERE clause unless it is in a subquery contained in a HAVING clause or a select list, and the column being aggregated is an outer reference.

What I have tried:

SQL

USE [NEWCMO]
GO

SELECT [Months]
      ,[Patient/Month]
      ,[Gross]
      ,[Abatement]
      ,[Net]
  FROM [dbo].[tblMonthlyReports]
GO

SELECT Payment FROM tblPayment WHERE Payment=(SELECT SUM(Payment) AS Gross FROM tblMonthlyReports);

Posted 12-Feb-17 17:00pm

Member 12905345

Updated 13-Feb-17 7:02am

Tomas Takac

v2

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NightWizzard · Accepted Answer · 2017-02-13T07:02:00

If you're using aggregate functions you always have to add a GROUP BY clause to tell the SQL engine by which column value it should aggregate (group) the data. The HAVING clause may be used to filter the resulting rows but this is not required, if not needed. Your query should look something like:

SQL

SELECT Months
     , SUM(Payment) AS Gross
  FROM tblMonthlyReports
GROUP BY Months
WHERE Months IS NOT NULL
  AND Payment IS NOT NULL

THis will result in several records each showing the sum of payments for the belonging month (one record for each month that occurs in tblMonthlyReports).

...and don't forget the WHERE clause, otherwise the aggreation may stop at the first NULL value which will lead into incorrect results!