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SELECT - GROUP BY clause (Transact-SQL)

Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics SQL analytics endpoint in Microsoft Fabric Warehouse in Microsoft Fabric SQL database in Microsoft Fabric A ...
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COUNT_BIG (Transact-SQL)

An expression of any type. COUNT_BIG doesn't support aggregate functions or subqueries in an expression. COUNT_BIG(*) returns the number of items in a group. This count includes NULL values and ...