MySQL LTRIM() 和 RTRIM() 函数可用于消除表中列值的前导和尾随空格。即使我们在 WHERE 子句中应用条件，这些函数也能正常工作。
示例
mysql> Select LTRIM(Name) from Student; +-------------+ | LTRIM(Name) | +-------------+ | Gaurav | | Aarav | | Harshit | | Gaurav | | Yashraj | +-------------+ 5 rows in set (0.13 sec)
上面的查询从“Name”列的值中删除前导空格字符。
mysql> Select RTRIM(Name) from Student; +-------------+ | RTRIM(Name) | +-------------+ | Gaurav | | Aarav | | Harshit | | Gaurav | | Yashraj | +-------------+ 5 rows in set (0.00 sec)
上面的查询从“Name”列的值中删除尾随空格字符。
mysql> Select LTRIM(Name) from Student Where Name = 'Harshit'; +-------------+ | LTRIM(Name) | +-------------+ | Harshit | +-------------+ 1 row in set (0.05 sec)
上面的查询从值中删除前导空格字符，即在“Name”列的 WHERE 子句“Harshit”中给出的值。
mysql> Select RTRIM(Name) from Student Where Name = 'Gaurav'; +-------------+ | RTRIM(Name) | +-------------+ | Gaurav | | Gaurav | +-------------+ 2 rows in set (0.00 sec)
上面的查询从值中删除尾随空格字符，即在“Name”列的 WHERE 子句“Gaurav”中给出的值。
