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How to get row count of two tables in different databases in a single query?
For this, you can use aggregate function COUNT(*). Let us first create a table in let’s say database “web” −
mysql> create table DemoTable1 -> ( -> Value int -> ); Query OK, 0 rows affected (0.60 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1 values(10); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable1 values(20); Query OK, 1 row affected (0.15 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable1;
Output
This will produce the following output −
+-------+ | Value | +-------+ | 10 | | 20 | +-------+ 2 rows in set (0.00 sec)
Following is the query to create second table in another database with the name “test” −
mysql> create table DemoTable2 -> ( -> Value int -> ); Query OK, 0 rows affected (0.68 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable2 values(100); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable2 values(200); Query OK, 1 row affected (0.15 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable2;
Output
This will produce the following output −
+-------+ | Value | +-------+ |100 | |200 | +-------+ 2 rows in set (0.00 sec)
Following is the query to get row count of 2 tables in different databases in a single query −
mysql> select -> ( -> select count(*) from web.DemoTable1) AS Table1Count, -> (select count(*) from test.DemoTable2) AS Table2Count;
Output
This will produce the following output −
+---------------+---------------+ | Table1Count | Table2Count | +---------------+---------------+ | 2 | 2 | +---------------+---------------+ 1 row in set (0.06 sec)
Updated on: 30-Jun-2020
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