How to count rows from two tables in a single MySQL query?

Let us first create a table −

mysql> create table DemoTable1 (    Name varchar(40) ); Query OK, 0 rows affected (0.81 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1 values('Chris'); Query OK, 1 row affected (0.48 sec) mysql> insert into DemoTable1 values('Robert'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable1 values('Mike'); Query OK, 1 row affected (0.10 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable1;

This will produce the following output −

+--------+ | Name   | +--------+ | Chris  | | Robert | | Mike   | +--------+ 3 rows in set (0.00 sec)

Following is the query to create the second table −

mysql> create table DemoTable2 (    Score int ); Query OK, 0 rows affected (1.16 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable2 values(86); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable2 values(98); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable2 values(75); Query OK, 1 row affected (0.14 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable2;

This will produce the following output −

+-------+ | Score | +-------+ | 86    | | 98    | | 75    | +-------+ 3 rows in set (0.00 sec)

Following is the query to count rows from two tables in one query −

mysql> select    (select count(*) from DemoTable1) AS FirstTableCount,    (select count(*) from DemoTable2) AS SecondTableCount    from dual;

This will produce the following output −

+-----------------+------------------+ | FirstTableCount | SecondTableCount | +-----------------+------------------+ | 3               | 3                | +-----------------+------------------+ 1 row in set (0.00 sec)