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Total number of fields in all tables in database?
To get total number of fields in all tables in database, you can use information_schema.columns along with aggregate function count(*).
We are using ‘sample’ database which consists of a lot of tables with fields. Following is the query to get total number of fields in all tables in database:
mysql> SELECT COUNT(*) AS TOTAL_NUMBER_OF_FIELDS -> FROM INFORMATION_SCHEMA.COLUMNS -> WHERE TABLE_SCHEMA = 'sample';
This will produce the following output
+------------------------+ | TOTAL_NUMBER_OF_FIELDS | +------------------------+ | 796 | +------------------------+ 1 row in set (0.04 sec)
Now, let us check another database ‘test’. Following is the query to get total number of fields in all tables in database:
mysql> SELECT COUNT(*) AS TOTAL_NUMBER_OF_FIELDS -> FROM INFORMATION_SCHEMA.COLUMNS -> WHERE TABLE_SCHEMA= 'test';
This will produce the following output
+------------------------+ | TOTAL_NUMBER_OF_FIELDS | +------------------------+ | 1108 | +------------------------+ 1 row in set (0.03 sec)
Updated on: 30-Jul-2019
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