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並前往https://stackoverflow.com/questions/8470813/how-do-i-check-if-a-column-is-empty-or-null-in-mysql

How do I check if a column is empty or null in MySQL? - Stack ...

20 Answers · Use of Trim to check-. SELECT FirstName FROM UserDetails WHERE TRIM(LastName) IS NULL · Use of LTRIM & RTRIM to check-. SELECT ...

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