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MySQL query to get a substring from a string except the last three characters?
For this, you can use SUBSTR along with length().
Let us first create a table −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(20) ); Query OK, 0 rows affected (1.31 sec)
Following is the query to insert some records in the table using insert command −
mysql> insert into DemoTable(FirstName) values('John');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(FirstName) values('Carol');
Query OK, 1 row affected (0.22 sec)
mysql> insert into DemoTable(FirstName) values('Robert');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(FirstName) values('Chris');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable(FirstName) values('David');
Query OK, 1 row affected (0.17 sec)Following is the query to display records from the table using select command −
mysql> select *from DemoTable;
This will produce the following output −
+----+-----------+ | Id | FirstName | +----+-----------+ | 1 | John | | 2 | Carol | | 3 | Robert | | 4 | Chris | | 5 | David | +----+-----------+ 5 rows in set (0.00 sec)
Following is the query to get a substring removing the last 3 characters −
mysql> select substr(FirstName,1,length(FirstName)-3) from DemoTable;
This will produce the following output −
+-----------------------------------------+ | substr(FirstName,1,length(FirstName)-3) | +-----------------------------------------+ | J | | Ca | | Rob | | Ch | | Da | +-----------------------------------------+ 5 rows in set (0.00 sec)
To get same output, you can use following alternate query −
mysql> select left(FirstName,length(FirstName)-3) from DemoTable;
This will produce the following output −
+-------------------------------------+ | left(FirstName,length(FirstName)-3) | +-------------------------------------+ | J | | Ca | | Rob | | Ch | | Da | +-------------------------------------+ 5 rows in set (0.00 sec)
To get last three characters, you can use the following query −
mysql> select substr(FirstName,-3) from DemoTable;
This will produce the following output −
+----------------------+ | substr(FirstName,-3) | +----------------------+ | ohn | | rol | | ert | | ris | | vid | +----------------------+ 5 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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