For an SQL developer hoping to bag their dream job, mastering complex SQL queries is a must for cracking that SQL interview. In this competitive space, the importance of knowing the kind of complex SQL interview questions you can expect can’t be overstated. This article offers sample complex SQL interview questions to help you assess and direct your SQL interview preparation.
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In this article, we’ll learn:
Here are some sample complex SQL interview questions and answers to help you with your complex SQL preparation:
Q1. Write a query to get the last record from a table?
select * from Student where RowID = select max(RowID) from Student;
Q2. Write a query to get the first record from a table?
The first record can be fetched in two ways, one similar to the last record case, but with min:
select * from Student where RowID = select min(RowID) from Student;
The other method is by printing just one (first) row of the table:
select * from Student where Rownum = 1;
Q3. Write a query to display the first ten records from a table.
select * from Student where Rownum <= 10;
Q4. Create a table with the same structure with data as in the Student table.
Create table Student2 as Select * from Student;
Q5. Show only common records between two tables.
Select * from Student;
Intersect
Select * from StudentA;
Want to know what SQL interview questions are asked at Facebook? Read this article.
Now, check out these frequently asked complex SQL interview questions to gauge your interview preparation:
These complex PL SQL server questions regularly feature at tech interviews for SQL developers:
Check out this article for more basic and advanced PL SQL interview questions.
Interview questions related to complex SQL queries are quite common at interviews for developers. These involve questions like “what SQL query would you use to”:
To practice more SQL interview questions, read this article.
Q1. What is a complex SQL query?
Complex SQL queries are parameter queries that go beyond the standard SQL usage of SELECT and WHERE and use two or more parameters. They also often heavily use AND and OR clauses. Complex queries are helpful because we can make more precise and accurate database searches with them.
Q2. How complex is SQL?
SQL is generally an easy language you can learn in a few weeks if you already understand programming. It can take you longer to learn if you’re new to programming.
Q3. What is advanced SQL?
Advanced SQL involves experience with administrative roles. An SQL programmer should know hardware layout, user management, replication, and backups.
Q4. What is the difference between simple and complex views in SQL?
Simple views in SQL can contain only one base table. On the other hand, complex views in SQL have more than one base table. Complex views can also have a group by clause, join conditions, and order by clause.
Q5. What SQL skills are considered intermediate?
In intermediate SQL skills, you must know and understand: the working and implementation of indexes, how to write a query across multiple tables, create and modify databases, perform recursive joins and pattern-matching, and subqueries table relations.
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