NULL in Oracle NULL = NULL ? 1SELECT CASE 2 WHEN NULL = NULL THEN 'NULL Equals to NULL' 3 ELSE 'NULL is NOT Equals to NULL' 4 END NULL_ 5 FROM DUAL; NULL_ NULL is NOT Equals to NULL COUNT with NULLs 1WITH tab 2 AS (SELECT 10 a FROM DUAL 3 UNION ALL 4 SELECT NULL a FROM DUAL 5 UNION ALL 6 …

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