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This SQL tutorial explains how to use the SQL EXISTS condition with syntax and examples. Click the Try It button next to an example to test it for yourself in our SQL Editor. The SQL EXISTS condition is used in combination with a subquery and is considered to be met, if the subquery returns at least one row.
When you run a query such as the ones above, it should be noted that the subquery runs first. The subquery in the EXISTS and NOT EXISTS statements is the query that returns order records. This query runs first. Then, the main or âouterâ query runs. In the above examples, the outer query is the select statement based on the customers table. In this statement, a list of orders is returned based on the order date.