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Overview of the SQL Count Distinct Function
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KB442655: Default value changed for "Separate Count Distinct" VLDB setting for Impala 2.x database and leads to different SQL
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SQL query for distinct count - Microsoft Q&A
COUNT, DISTINCT, and NULLs in SQL Server - YouTube
SQL query for distinct count - Microsoft Q&A
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Need SQL Query to Get distinct of Column with max of that with Other Columns - Microsoft Q&A
