MySQL query to get string from one column and find its position in another column with comma separated values?

For this, use FIND_IN_SET(). Let us first create a table −

mysql> create table DemoTable1866
     (
     Value1 int,
     ListOfValues varchar(100)
     );
Query OK, 0 rows affected (0.00 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1866 values(56,'78,56,98,95');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1866 values(103,'103,90,102,104');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1866 values(77,'34,45,77,78');
Query OK, 1 row affected (0.00 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable1866;

This will produce the following output −

+--------+----------------+
| Value1 | ListOfValues   |
+--------+----------------+
|     56 | 78,56,98,95    |
|    103 | 103,90,102,104 |
|     77 | 34,45,77,78    |
+--------+----------------+
3 rows in set (0.00 sec)

Here is the query to get string position in another column −

mysql> select Value1,ListOfValues,find_in_set(Value1,ListOfValues) as Output from DemoTable1866;

This will produce the following output −

+--------+----------------+--------+
| Value1 | ListOfValues   | Output |
+--------+----------------+--------+
|     56 | 78,56,98,95    |      2 |
|    103 | 103,90,102,104 |      1 |
|     77 | 34,45,77,78    |      3 |
+--------+----------------+--------+
3 rows in set (0.00 sec)