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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)
Updated on: 24-Dec-2019
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