Match column values on the basis of the other two column values in MySQL



Let us first create a table −

mysql> create table DemoTable774 (
   Id int,
   FirstName varchar(100),
   MatchId int
);
Query OK, 0 rows affected (0.62 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable774 values(101,'Chris',104);
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable774 values(102,'Adam',103);
Query OK, 1 row affected (0.23 sec)
mysql> insert into DemoTable774 values(103,'Carol',102);
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable774 values(104,'Bob',101);
Query OK, 1 row affected (0.16 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable774;

This will produce the following output -

+------+-----------+---------+
| Id   | FirstName | MatchId |
+------+-----------+---------+
|  101 | Chris     |     104 |
|  102 | Adam      |     103 |
|  103 | Carol     |     102 |
|  104 | Bob       |     101 |
+------+-----------+---------+
4 rows in set (0.00 sec)

Following is the query to display FirstName on the basis of ID and MatchID −

mysql> select tbl1.FirstName, tbl2.FirstName from DemoTable774 AS tbl1
   left join DemoTable774 AS tbl2 ON( tbl1.MatchId = tbl2.Id );

This will produce the following output -

+-----------+-----------+
| FirstName | FirstName |
+-----------+-----------+
| Bob       | Chris     |
| Carol     | Adam      |
| Adam      | Carol     |
| Chris     | Bob       |
+-----------+-----------+
4 rows in set (0.03 sec)
raja
Published on 03-Sep-2019 08:59:52
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