When working with subqueries, which query will execute first?1 pointLeftmostRightmostOutermostInnermost

The correct answer is Innermost.

Explanation:

In a SQL query containing subqueries, the execution order starts from the innermost query. This is because the innermost subquery needs to execute first to provide the necessary results or data that the outer query relies on. Once the innermost subquery completes and returns its result set, the execution moves outward, processing each subsequent outer subquery in order until it reaches the outermost query, which finally returns the final result set to the user.

For example, in a SQL statement like:

SELECT column1
FROM table1
WHERE column2 = (SELECT column2 FROM table2 WHERE condition);

Here, the subquery (SELECT column2 FROM table2 WHERE condition) is executed first. Its result is then used by the outer query. This hierarchical flow of execution ensures that each level of the query has the required data from the inner levels before processing the outer levels.