How can I tell how many tables are in a MySQL database?
To check the count of tables. mysql> SELECT count(*) AS TOTALNUMBEROFTABLES -> FROM INFORMATION_SCHEMA. TABLES -> WHERE TABLE_SCHEMA = ‘business’; The following output gives the count of all the tables.
How do I view two tables in MySQL?
You can use a JOIN SELECT query to combine information from more than one MySQL table. With JOIN, the tables are combined side by side, and the information is retrieved from both tables. Tables are combined by matching data in a column — the column that they have in common.
How to check if table exists in database?
If you want to check if a certain table exists into a MySQL database, you can use this SQL query: SHOW TABLES IN `databasename` WHERE `Tables_in_databasename` = ‘table_name’ – For example, to check if the “users” table exists in the “tests” database, we can use this code in PHP:
Is there a way to show all table in MySQL?
For the database that has many tables, showing all tables at a time may not be intuitive. Fortunately, the SHOW TABLES command provides you with an option that allows you to filter the returned tables using the LIKE operator or an expression in the WHERE clause as follows: SHOW TABLES LIKE pattern; SHOW TABLES WHERE expression;
What happens if there is no record in MySQL?
If there’s a record, it exists. If there’s no record, it doesn’t exist. This modified solution from above does not require explicit knowledge of the current database. It is then more flexible. Just to add an extra way to do it, and depending on what you need it for you could use a handler for er_no_such_table error:1146 like this:
How many tries does it take to select a table in MySQL?
A performance comparison: MySQL 5.0.77, on a db that has about 11,000 tables. Selecting a non-recently-used table so it’s not cached. Averaged over 10 tries each. (Note: done with different tables to avoid caching).