To fetch total number of table rows across databases, use aggregate function SUM() along with INFORMATION SCHEMA. Let us first create a table, which is in “web” database −
mysql> create table DemoTable1568 -> ( -> Name varchar(20) -> ); Query OK, 0 rows affected (0.61 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1568 values('Chris');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable1568 values('Bob');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable1568 values('David');
Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −
mysql> select * from DemoTable1568;
This will produce the following output −
+-------+ | Name | +-------+ | Chris | | Bob | | David | +-------+ 3 rows in set (0.00 sec)
Following is the query to create a table in the database “sample” −
mysql> use sample; Database changed mysql> create table DemoTable1568 -> ( -> Id int -> ); Query OK, 0 rows affected (0.99 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1568 values(101); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1568 values(102); Query OK, 1 row affected (0.34 sec) mysql> insert into DemoTable1568 values(103); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable1568 values(104); Query OK, 1 row affected (0.14 sec)
Display all records from the table using select statement −
mysql> select * from DemoTable1568;
This will produce the following output −
+------+ | Id | +------+ | 101 | | 102 | | 103 | | 104 | +------+ 4 rows in set (0.00 sec)
Here is the query to find total number of rows of tables across multiple databases −
mysql> select sum(table_rows) as TotalNumberOfRows from information_schema.tables -> where table_name='DemoTable1568';
This will produce the following output −
+-------------------+ | TotalNumberOfRows | +-------------------+ | 7 | +-------------------+ 1 row in set (0.19 sec)