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Discard last 3 characters of a field in MySQL
Let us first create a table −
mysql> create table DemoTable -> ( -> StudentId varchar(100) -> ); Query OK, 0 rows affected (0.58 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values('STU-090');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable values('STU-123');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values('STU-678');
Query OK, 1 row affected (0.29 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
Output
This will produce the following output −
+-----------+ | StudentId | +-----------+ | STU-090 | | STU-123 | | STU-678 | +-----------+ 3 rows in set (0.00 sec)
Following is the query to discard last 3 characters of a field −
mysql> SELECT REVERSE(SUBSTR(REVERSE(StudentId), 4)) from DemoTable
Output
This will produce the following output −
+----------------------------------------+ | REVERSE(SUBSTR(REVERSE(StudentId), 4)) | +----------------------------------------+ | STU- | | STU- | | STU- | +----------------------------------------+ 3 rows in set (0.00 sec)
Updated on: 30-Jun-2020
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