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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)
Updated on: 22-Aug-2019
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