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Select first element of a commaseparated list in MySQL?
To select first element of a comma-separated list, you can use SUBSTRING_INDEX(). Let us first create a table:
mysql> create table DemoTable ( CSV_Value varchar(200) ); Query OK, 0 rows affected (0.81 sec)
Following is the query to insert some records in the table using insert command. We have inserted records in the form of comma-separated integer list:
mysql> insert into DemoTable values('10,20,50,80');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable values('100,21,51,43');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values('1,56,103,1090');
Query OK, 1 row affected (0.26 sec)Following is the query to display records from the table using select command:
mysql> select *from DemoTable;
This will produce the following output:
+---------------+ | CSV_Value | +---------------+ | 10,20,50,80 | | 100,21,51,43 | | 1,56,103,1090 | +---------------+ 3 rows in set (0.00 sec)
Following is the query to select first element of a comma-separated list:
mysql> select SUBSTRING_INDEX(CSV_Value,',',1) AS FIRST_ELEMENT from DemoTable;
This will produce the following output. First element of every list is displayed here:
+---------------+ | FIRST_ELEMENT | +---------------+ | 10 | | 100 | | 1 | +---------------+ 3 rows in set (0.03 sec)
Updated on: 30-Jul-2019
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