MySQL query to keep only first 2 characters in column value and delete rest of the characters?
To keep only first two characters and delete rest of the characters, use SUBSTRING().
Let us first create a table −
mysql> create table DemoTable743 (SubjectName varchar(100));
Query OK, 0 rows affected (0.54 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable743 values('MySQL');
Query OK, 1 row affected (0.20 sec)
mysql> insert into DemoTable743 values('Java');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable743 values('MongoDB');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable743 values('Python');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable743 values('Data Structure');
Query OK, 1 row affected (0.68 sec)
mysql> insert into DemoTable743 values('Algorithm');
Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −
mysql> select *from DemoTable743;
This will produce the following output -
+----------------+
| SubjectName |
+----------------+
| MySQL |
| Java |
| MongoDB |
| Python |
| Data Structure |
| Algorithm |
+----------------+
6 rows in set (0.00 sec)
Following is the query to keep first 2 characters in column value and delete rest of the characters−
mysql> update DemoTable743 set SubjectName=SUBSTRING(SubjectName,1,2);
Query OK, 6 rows affected (0.12 sec)
Rows matched: 6 Changed: 6 Warnings: 0
Let us check the table records once again −
mysql> select *from DemoTable743;
This will produce the following output -
+-------------+
| SubjectName |
+-------------+
| My |
| Ja |
| Mo |
| Py |
| Da |
| Al |
+-------------+
6 rows in set (0.00 sec)
Published on 22-Aug-2019 08:07:48
