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Update all rows in MySQL and remove all the unnecessary whitespaces in and around the string?
To remove unnecessary whitespaces, use TRIM() in MySQL. Let us first create a −
mysql> create table DemoTable1405 -> ( -> FirstName varchar(20), -> LastName varchar(20) -> ); Query OK, 0 rows affected (0.55 sec)
Insert some records in the table using insert −
mysql> insert into DemoTable1405 values(' Chris',' Brown ');
Query OK, 1 row affected (0.20 sec)
mysql> insert into DemoTable1405 values('David ',' Miller ');
Query OK, 1 row affected (0.24 sec)
mysql> insert into DemoTable1405 values(' Carol ',' Taylor ');
Query OK, 1 row affected (0.19 sec)Display all records from the table using select −
mysql> select * from DemoTable1405;
This will produce the following output −
+------------------+----------------+ | FirstName | LastName | +------------------+----------------+ | Chris | Brown | | David | Miller | | Carol | Taylor | +------------------+----------------+ 3 rows in set (0.00 sec)
Following is the query to remove all the unnecessary whitespaces and update all rows −
mysql> update DemoTable1405 set FirstName=trim(FirstName),LastName=trim(LastName); Query OK, 3 rows affected (0.18 sec) Rows matched: 3 Changed: 3 Warnings: 0
Let us check the table records once again −
mysql> select * from DemoTable1405;
This will produce the following output −
+-----------+----------+ | FirstName | LastName | +-----------+----------+ | Chris | Brown | | David | Miller | | Carol | Taylor | +-----------+----------+ 3 rows in set (0.00 sec)
Updated on: 11-Nov-2019
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