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11 Lessons to learn when using NULLs in PostgreSQL®

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11 Lessons to Learn When Using NULLs — NULL represents a missing, unknown or ‘non’-value in...
11 Lessons to Learn When Using NULLs — NULL represents a missing, unknown or ‘non’-value in SQL and it has some interesting properties and behaviors to be aware of.

coding isnull null postgres software
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