How to select and display a list of values in one column that are available in two different MySQL columns?

For this, use UNION ALL. Let us first create a table −

mysql> create table DemoTable1813      (      Name1 varchar(20),      Name2 varchar(20)      ); Query OK, 0 rows affected (0.00 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1813 values('John','Chris'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1813 values('Adam','Robert'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1813 values('Mike','Sam'); Query OK, 1 row affected (0.00 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable1813;

This will produce the following output −

+-------+--------+ | Name1 | Name2  | +-------+--------+ | John  |  Chris | | Adam  |  Robert| | Mike  |    Sam | +-------+--------+ 3 rows in set (0.00 sec)

Here is the query to select a list of values in one column that are available in two different columns

mysql> select Name1 as Name from DemoTable1813      union all      select Name2 as Name from DemoTable1813;

This will produce the following output −

+--------+ | Name   | +--------+ | John   | | Adam   | | Mike   | | Chris  | | Robert | | Sam    | +--------+ 6 rows in set (0.00 sec)