MySQL GROUP BY doesn't work when migrated to SQL Server 2012

Question

I\'m moving my Delphi application from MySQL to SQL server 2012. In MySQL I had this query:

SELECT *,(XS+S+M+L+XL+XXL+[1Size]+Custom) as Total FROM StockData  
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Answer 1

All columns in an aggregate query must either be used by an aggregate function or a group by. Try only selecting the columns you require rather than * I.e. select stylenr, customer, color, ([...] ) as Total from.

This is a SQL standard way of dealing with aggregates, you'd get a similar error in Oracle.