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Concatenate two tables in MySQL with a condition?
To concatenate two tables, UNION ALL in MySQL. Let us create a table −
mysql> create table DemoTable1 ( Id int, FirstName varchar(20) ); Query OK, 0 rows affected (1.52 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1 values(10,'John'); Query OK, 1 row affected (0.28 sec) mysql> insert into DemoTable1 values(20,'Carol'); Query OK, 1 row affected (0.28 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable1;
Output
+------+-----------+ | Id | FirstName | +------+-----------+ | 10 | John | | 20 | Carol | +------+-----------+ 2 rows in set (0.00 sec)
Create second table.
mysql> create table DemoTable2 ( Id int, FirstName varchar(20) ); Query OK, 0 rows affected (1.22 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable2 values(20,'David'); Query OK, 1 row affected (1.28 sec) mysql> insert into DemoTable2 values(40,'Chris'); Query OK, 1 row affected (0.38 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable2;
Output
+------+-----------+ | Id | FirstName | +------+-----------+ | 20 | David | | 40 | Chris | +------+-----------+ 2 rows in set (0.00 sec)
Following is the query to concatenate two tables −
mysql> select *from DemoTable1 where Id=20 union all select *from DemoTable2 where Id=20;
Output
+------+-----------+ | Id | FirstName | +------+-----------+ | 20 | Carol | | 20 | David | +------+-----------+ 2 rows in set (0.43 sec)
Updated on: 30-Jul-2019
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