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並前往https://serverfault.com/questions/1069084/why-does-mariadb-char-length-return-null-instead-of-0-when-a-field-is-null

Why does MariaDB CHAR_LENGTH return NULL instead of 0 ...

Surround each with COALESCE(..., 0) . mysql> SELECT CHAR_LENGTH(null), CHAR_LENGTH(''), CHAR_LENGTH('abc'); ...

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