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How to select all distinct filename extensions from a table of filenames in MySQL?
You can use DISTINCT along with SUBSTRING_INDEX() to extract the filename extensions. Let us first create a table−
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FileName text ); Query OK, 0 rows affected (0.75 sec)
Insert records in the table using insert command −
mysql> insert into DemoTable(FileName) values('AddTwoValue.java');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable(FileName) values('Image1.png');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable(FileName) values('MultiplicationOfTwoNumbers.java');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable(FileName) values('Palindrome.c');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable(FileName) values('FoodCart.png');
Query OK, 1 row affected (0.25 sec)
mysql> insert into DemoTable(FileName) values('Permutation.py');
Query OK, 1 row affected (0.18 sec)Display all records from the table using select statement −
mysql> select * from DemoTable;
This will produce the following output−
+----+---------------------------------+ | Id | FileName | +----+---------------------------------+ | 1 | AddTwoValue.java | | 2 | Image1.png | | 3 | MultiplicationOfTwoNumbers.java | | 4 | Palindrome.c | | 5 | FoodCart.png | | 6 | Permutation.py | +----+---------------------------------+ 6 rows in set (0.00 sec)
Following is the query to select all distinct filename extensions from a table of filenames−
mysql> SELECT DISTINCT SUBSTRING_INDEX(FileName,'.',-1) FROM DemoTable;
This will produce the following output−
+----------------------------------+ | SUBSTRING_INDEX(FileName,'.',-1) | +----------------------------------+ | java | | png | | c | | py | +----------------------------------+ 4 rows in set (0.03 sec)
Updated on: 30-Jul-2019
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