Learn how to master the SELECT statement ... rows in any result set. SELECT COUNT(*) FROM Sales WHERE net_amount > 100; If you want to see how many rows contain non-null values for a particular ...

Read this SQL tutorial to ... a simple SELECT statement will meet your needs. JOIN works in the same way as the SELECT statement above: It returns a result set with columns from different tables.

Older hierarchical databases only allow a record to belong to one set ... SQL. For comparison, the equivalent SQL query to return all of the students in CS 101 would be something like SELECT ...