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whether a field is NULL or not?

April 26, 2017field null

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whether a field is NULL or not?

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635 636 You test the column with IS NULL and IS NOT NULL, like this: 637 SELECT * 638 FROM tab 639 WHERE col IS NULL; 640 641 To sort by the NULL status, use the IS NULL and IS NOT NULL modifiers 642 in your ORDER BY clause.