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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 SERVER - Puzzle - DISTINCT Values in NVARCHAR - SQL Authority with Pinal Dave
7 Examples that Explain SQL SELECT DISTINCT (MySQL and SQL Server)
SQL SELECT DISTINCT Examples
Distinct vs Group By in SQL Server” | by Smita Gudale | Medium
