How does Oracle calculate the data volume of multiple tables?

1 year ago
Emily Johnson
1 minute

In order to count the number of records from multiple tables, you can use Oracle’s system view user_tables to retrieve the row count of each table and then aggregate the results using SQL statements.

Here is an example query to calculate the total data volume for tables table1, table2, and table3.

SELECT SUM(num_rows) AS total_rows
FROM user_tables
WHERE table_name IN ('table1', 'table2', 'table3');

By listing the table names that need to be counted in the IN clause and using the SUM function to calculate the sum of num_rows, you can obtain the total amount of data for all tables. Make sure to replace the actual table names in the query.

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