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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)
Updated on: 06-Jul-2020
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