How to update a value with substring of current value by removing the separator and numbers after a separator in MySQL?

Here, let’s say you have a string with form “StringSeparatorNumber” form like John/56989. Now if you want to remove the number after separator /, then use the SUBSTRING_INDEX(). Let us first create a table −

mysql> create table DemoTable (    StudentName varchar(100) ); Query OK, 0 rows affected (1.05 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values('John/56989'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('Carol'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values('David/74674'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('Bob/45565'); Query OK, 1 row affected (0.09 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+-------------+ | StudentName | +-------------+ | John/56989 | | Carol       | | David/74674 | | Bob/45565 | +-------------+ 4 rows in set (0.00 sec)

Following is the query to update a value with substring of current value −

mysql> update DemoTable set StudentName=substring_index(StudentName,'/',1); Query OK, 3 rows affected (0.13 sec) Rows matched :4 Changed :3 Warnings :0

Let us check the table records once again −

mysql> select *from DemoTable;

This will produce the following output −

+-------------+ | StudentName | +-------------+ | John       | | Carol       | | David       | | Bob       | +-------------+ 4 rows in set (0.00 sec)