Cool MySQL Database Queries

1. Select a count of all rows in your database:

SELECT SUM(table_rows) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = 'database_name';

2. Select count of all rows of each table in your database:

SELECT table_name, table_rows FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = 'database_name';

3. Gets stats on a per hour basis, written out to CSV:

SELECT  DATE_FORMAT(date, '%m/%d/%Y %H:00:00') AS date, DATE_FORMAT(date, '%Y%m%d%H') AS hour, count(id) AS requests, max(time), avg(time),  count(distinct userName)  INTO OUTFILE '/tmp/usage.csv' FIELDS TERMINATED BY ',' FROM statslog GROUP BY hour ORDER BY hour ASC;