To remove all characters after the last comma in the string, you can use SUBSTRING_INDEX().
If you do not know the location of the last comma, then you need to find the last comma dynamically using LENGTH().
The syntax is as follows −
UPDATE yourTableName set yourColumnName = SUBSTRING_INDEX(yourColumnName, ',', LENGTH(yourColumnName) - LENGTH(REPLACE(yourColumnName, ',', '')));
To understand the above syntax, let us create a table. The query to create a table is as follows −
mysql> create table RemoveAllCharacters -> ( -> Id int NOT NULL AUTO_INCREMENT, -> FullInfo varchar(200), -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (1.83 sec)
Insert some records in the table using insert command. The query is as follows −
mysql> insert into RemoveAllCharacters(FullInfo) values('John,Smith,23,98,4565886');
Query OK, 1 row affected (0.23 sec)
mysql> insert into RemoveAllCharacters(FullInfo) values('Carol,Taylor,26,91');
Query OK, 1 row affected (0.28 sec)
mysql> insert into RemoveAllCharacters(FullInfo) values('David,Miller,21');
Query OK, 1 row affected (0.11 sec)
mysql> insert into RemoveAllCharacters(FullInfo) values('Robert,Jones,22,97');
Query OK, 1 row affected (0.09 sec)
mysql> insert into RemoveAllCharacters(FullInfo)
values('Sam,Williams,27,88,456788,97877');
Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement. The query is as follows −
mysql> select *from RemoveAllCharacters;
The following is the output −
+----+---------------------------------+ | Id | FullInfo | +----+---------------------------------+ | 1 | John,Smith,23,98,4565886 | | 2 | Carol,Taylor,26,91 | | 3 | David,Miller,21 | | 4 | Robert,Jones,22,97 | | 5 | Sam,Williams,27,88,456788,97877 | +----+---------------------------------+ 5 rows in set (0.00 sec)
The following is the query to remove all characters after last comma in string −
mysql> update RemoveAllCharacters -> set FullInfo = SUBSTRING_INDEX(FullInfo, ',', LENGTH(FullInfo) - LENGTH(REPLACE(FullInfo, ',', ''))); Query OK, 5 rows affected (0.28 sec) Rows matched: 5 Changed: 5 Warnings: 0
Now check all the records of table once again. The query is as follows −
mysql> select *from RemoveAllCharacters;
The following is the output displaying the records without the characters after the last comma:
+----+---------------------------+ | Id | FullInfo | +----+---------------------------+ | 1 | John,Smith,23,98 | | 2 | Carol,Taylor,26 | | 3 | David,Miller | | 4 | Robert,Jones,22 | | 5 | Sam,Williams,27,88,456788 | +----+---------------------------+ 5 rows in set (0.00 sec)