Learn how to easily fix the your query does not include the specified expression as part of an aggregate function SQL error.

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If you have an aggregation function (sum, avg, count) in your select clause or if you have a group by clause, all of your columns must be aggregated or grouped.<BR><BR>In the version of SQL that I ...

It is very important to process efficiently expensive queries including joins and/or aggregate functions in a data warehousing environment since there resides an enormous volume of data and the ...