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How are the MySQL LTRIM() and RTRIM() functions used with the WHERE clause?

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2023-09-12 09:17:06710browse

MySQL LTRIM() 和 RTRIM() 函数如何与 WHERE 子句一起使用?

The MySQL LTRIM() and RTRIM() functions can be used to eliminate leading and trailing spaces from column values ​​in a table. These functions work fine even if we apply conditions in WHERE clause.

Example

mysql> Select LTRIM(Name) from Student;
+-------------+
| LTRIM(Name) |
+-------------+
| Gaurav      |
| Aarav       |
| Harshit     |
| Gaurav      |
| Yashraj     |
+-------------+
5 rows in set (0.13 sec)

The above query removes leading space characters from the value of the "Name" column.

mysql> Select RTRIM(Name) from Student;
+-------------+
| RTRIM(Name) |
+-------------+
| Gaurav      |
| Aarav       |
| Harshit     |
| Gaurav      |
| Yashraj     |
+-------------+
5 rows in set (0.00 sec)

The above query removes trailing space characters from the value of the "Name" column.

mysql> Select LTRIM(Name) from Student Where Name = 'Harshit';
+-------------+
| LTRIM(Name) |
+-------------+
| Harshit     |
+-------------+
1 row in set (0.05 sec)

The above query removes leading space characters from the value i.e. the value given in the WHERE clause "Harshit" of the "Name" column.

mysql> Select RTRIM(Name) from Student Where Name = 'Gaurav';
+-------------+
| RTRIM(Name) |
+-------------+
| Gaurav      |
| Gaurav      |
+-------------+
2 rows in set (0.00 sec)

The above query removes trailing space characters from the value i.e. the value given in the WHERE clause "Gaurav" of the "Name" column.

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