MySQL中如何获取指定字符串的长度？

MySQL 中的 CHAR_LENGTH() 或 CHARACTER_LENGTH() 字符串函数用于检索指定字符串的长度。该函数只会计算字符数，而忽略字符是单字节还是多字节。

mysql> Select CHAR_LENGTH('New Delhi'); +--------------------------+ | CHAR_LENGTH('New Delhi') | +--------------------------+ | 9 | +--------------------------+ 1 row in set (0.00 sec) mysql> Select CHAR_LENGTH('NewDelhi'); +-------------------------+ | CHAR_LENGTH('NewDelhi') | +-------------------------+ | 8 | +-------------------------+ 1 row in set (0.00 sec) mysql> Select CHARACTER_LENGTH('NewDelhi'); +------------------------------+ | CHARACTER_LENGTH('NewDelhi') | +------------------------------+ | 8 | +------------------------------+ 1 row in set (0.00 sec) mysql> Select CHARACTER_LENGTH('New Delhi'); +-------------------------------+ | CHARACTER_LENGTH('New Delhi') | +-------------------------------+ | 9 | +-------------------------------+ 1 row in set (0.00 sec)

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