To fetch the last record using the MAX() function, use a subquery to get the max WORKER_ID and then filter the main query to return the row matching that WORKER_ID. Query #42 Run Show Solution 43. Write SQL Query to Fetch the First Row of a Table. To fetch the first row from ...
The use of comparison operators like <,> or = can be done in a subquery. These kinds ofSQL Interview Questionsare a bit difficult to understand and answer accordingly. There are a lot ofSQL Interview Questionsapart from this, which the candidates must practice qualifying for the interview. Fo...
18. What is a Subquery? What are its types? 19. What is a Primary Key? 20. What are Constraints in SQL? 21. What are Tables and Fields? 22. What is the difference between SQL and MySQL? 23. What is SQL? 24. What is RDBMS? How is it different from DBMS? 25. What is DBMS?
SQL Practice Exercises: Work on diverse queries like filtering, joining, and aggregating data to build your expertise. Test your knowledge with interactive quizzes that cover basic to advanced SQL concepts. Common SQL Interview Questions and Answers Prepare for SQL interviews with commonly asked ques...
Subquery can be placed either in FROM clause, WHERE clause or HAVING clause of the main query. Oracle allows a maximum nesting of 255 subquery levels in a WHERE clause. There is no limit for nesting subqueries expressed in a FROM clause.In practice, the limit of 255 levels is not really...
Frequently Asked Questions (FAQ) - SQL Correlated Subqueries 1.What are SQL Correlated Subqueries? SQL Correlated Subqueries are used to select data from a table referenced in the outer query. The subquery in a correlated subquery is related to the outer query, hence the term "correlated". Each...
What is a subquery? A subquery in SQL is like a query within a query. It helps you ask specific questions within a larger question. This nested query is used to filter or calculate data in a structured way. What is an SQL server?
TheINclause reads the entire subquery result set into memory before comparing. On the other hand, theEXISTSclause stops processing the subquery as soon as it finds a match. Here we have an example of how to use this clause: SELECT*FROMorders oWHEREEXISTS(SELECT1FROMcustomers cWHEREc.customer...
The types of subquery available and how to use them Convert rows-to-columns with PIVOT The basics of using window functions to calculate running totals Register athttps://devgym.oracle.com/pls/apex/dg/class/databases-for-developers-next-level.html ...
Tip: it’s handy to know that having a correlated subquery isn’t always a good idea. You can always consider getting rid of them by, for example, rewriting them with an INNER JOIN: SELECT driverslicensenr, name FROM drivers INNER JOIN fines ON fines.driverslicensenr = drivers.driverslicen...