Count(*) rows from multiple tables in MySQL?

To count rows from multiple tables in MySQL, the syntax is as follows −

Select     (select count(*) from yourTableName1) as anyAliasName1,     (select count(*) from yourTableName2) as anyAliasName2     from dual;

Let us first create a table −

mysql> create table DemoTable1    -> (    -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY    -> ); Query OK, 0 rows affected (0.56 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1 values(),(),(),(),(),(); Query OK, 6 rows affected (0.24 sec) Records: 6  Duplicates: 0  Warnings: 0

Display all records from the table using select statement −

mysql> select * from DemoTable1;

This will produce the following output −

+----+ | Id | +----+ |  1 | |  2 | |  3 | |  4 | |  5 | |  6 | +----+ 6 rows in set (0.00 sec)

Following is the query to create second table −

mysql> create table DemoTable2     -> (     -> Name varchar(20)     -> ); Query OK, 0 rows affected (0.64 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable2 values('Chris'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable2 values('David'); Query OK, 1 row affected (0.31 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable2;

This will produce the following output −

+-------+ | Name  | +-------+ | Chris | | David | +-------+ 2 rows in set (0.00 sec)

Following is the query to count rows from multiple tables −

mysql> select    -> (select count(*) from DemoTable1) as FirstTable1Count,    -> (select count(*) from DemoTable2) as SecondTable2Count    -> from dual;

This will produce the following output −

+---------------------+----------------------+ | FirstTable1Count    |    SecondTable2Count | +---------------------+----------------------+ |                   6 |                    2 | +---------------------+----------------------+ 1 row in set (0.00 sec)