如何在 MySQL WHERE 子句中使用 CHAR_LENGTH() 函数?
当将 CHAR_LENGTH() 或 CHARACTER_LENGTH() 字符串函数与 WHERE 子句一起使用时,其输出将根据 WHERE 子句中给出的条件而返回。例如,假设我们有一个名为“Student”的表,并且我们只想获取少于 6 个字符的姓名,那么我们可以编写以下查询:
mysql> Select * from Student; +------+---------+---------+-----------+ | Id | Name | Address | Subject | +------+---------+---------+-----------+ | 1 | Gaurav | Delhi | Computers | | 2 | Aarav | Mumbai | History | | 15 | Harshit | Delhi | Commerce | | 20 | Gaurav | Jaipur | Computers | +------+---------+---------+-----------+ 4 rows in set (0.10 sec) mysql> Select Name, CHAR_LENGTH(Name) from student WHERE CHAR_LENGTH(Name)<6; +-------+-------------------+ | Name | CHAR_LENGTH(Name) | +-------+-------------------+ | Aarav | 5 | +-------+-------------------+ 1 row in set (0.00 sec)
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