Aligned Automation Production Engineer Interview Questions and Answers

SQL joins are used to combine rows from two or more tables based on a related column between them.

• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• INNER JOIN returns rows when there is at least one match in both tables.

• LEFT JOIN returns all rows from the left table and the matched rows from the right table.

• RIGHT JOIN returns all rows from the right table and the matched rows from the left table.

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Correlated subqueries in SQL are subqueries that reference columns from the outer query.

• Correlated subqueries are executed for each row processed by the outer query.

• They can be used to filter results based on values from the outer query.

• Example: SELECT * FROM table1 WHERE column1 = (SELECT MAX(column2) FROM table2 WHERE table2.id = table1.id)