Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Videos > Database Management System (DBMS) > Subquery in SQL | Correlated Subquery + Complete SQL Subqueries Tutorial
Subquery in SQL | Correlated Subquery + Complete SQL Subqueries Tutorial Video Lecture | Database Management System (DBMS) - Computer Science Engineering (CSE)
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FAQs on Subquery in SQL - Correlated Subquery + Complete SQL Subqueries Tutorial Video Lecture - Database Management System (DBMS) - Computer Science Engineering (CSE)
| 1. What is a subquery in SQL? |  |
Ans. A subquery in SQL is a query nested within another query. It is used to return data that will be used in the main query for filtering or comparison purposes.
| 2. What is a correlated subquery in SQL? | |
Ans. A correlated subquery in SQL is a subquery that depends on the outer query for its values. It is executed once for each row processed by the outer query.
| 3. How can subqueries be helpful in SQL? | |
Ans. Subqueries can be helpful in SQL for performing complex queries, filtering data, retrieving data from multiple tables, and performing aggregate functions.
| 4. Can subqueries be used in different parts of a SQL query? | |
Ans. Yes, subqueries can be used in different parts of a SQL query such as the SELECT statement, WHERE clause, FROM clause, and even the HAVING clause.
| 5. What are some common mistakes to avoid when using subqueries in SQL? | |
Ans. Some common mistakes to avoid when using subqueries in SQL include not assigning an alias to the subquery result, not using the appropriate comparison operators, and not considering performance implications when using subqueries.
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Dec 22, 2024 Last updated |
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