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Delete last 4 letters in MySQL?
You can use SUBSTRING() along with UPDATE command to delete last 4 letters. Let us first create a table −
mysql> create table DemoTable ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentSubject varchar(100) ); Query OK, 0 rows affected (0.57 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(StudentSubject) values('Introduction to Java');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(StudentSubject) values('Introduction to C');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable(StudentSubject) values('Introduction to C++');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable(StudentSubject) values('Spring And Hibernate');
Query OK, 1 row affected (0.13 sec)Following is the query to display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+-----------+----------------------+ | StudentId | StudentSubject | +-----------+----------------------+ | 1 | Introduction to Java | | 2 | Introduction to C | | 3 | Introduction to C++ | | 4 | Spring And Hibernate | +-----------+----------------------+ 4 rows in set (0.00 sec)
Following is the query to delete last 4 letters −
mysql> update DemoTable set StudentSubject=SUBSTRING(StudentSubject, 1, LENGTH(StudentSubject)-4) ; Query OK, 4 rows affected (0.16 sec) Rows matched: 4 Changed: 4 Warnings: 0
Let us display all records from the table to check the last 4 letters have been deleted or not −
mysql> select *from DemoTable;
This will produce the following output −
+-----------+------------------+ | StudentId | StudentSubject | +-----------+------------------+ | 1 | Introduction to | | 2 | Introduction | | 3 | Introduction to | | 4 | Spring And Hiber | +-----------+------------------+ 4 rows in set (0.00 sec)
Yes, the last 4 letters have been deleted successfully.
Updated on: 30-Jul-2019
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