Mysql Not Null
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Mysql Not Null
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Mysql NOT IS NULL Behavior Stack Overflow
IS NOT NULL Tests whether a value is not NULL mysql SELECT 1 IS NOT NULL 0 IS NOT NULL NULL IS NOT NULL 1 1 0 ISNULL expr If expr is NULL ISNULL returns 1 otherwise it returns 0 mysql SELECT ISNULL 1 1 0 mysql SELECT ISNULL 1 0 1 The NULL value can be surprising until you get used to it Conceptually NULL means a missing unknown value and it is treated somewhat differently from other values To test for NULL use the IS NULL and IS NOT NULL operators as shown here mysql SELECT 1 IS NULL 1 IS NOT NULL 1 IS NULL 1 IS NOT NULL
MySQL IS NOT NULL
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