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)
Published on 24-Dec-2019 10:45:52
