Hello friends, in this SQL hands-on tutorial, you’ll find 50 tricky SQL queries for practice with their answers. Practicing tricky SQL queries is like sharpening your tools for working with data. SQL skills matter because they help you handle and understand information in databases, something t...
Following are some very important Complex SQL Queries Examples with answers. I have tried to explain each and every query in detail so that everyone will get idea of how it is executed step-by-step. In SQL and PL SQL interviews we require to know the key and important complex sql queries...
Here, we share the basic and advanced SQL queries asked in interview questions. Our tutorials explain the SQL syntax and commands in a super easy way.
The reason for this problem is related to the FruitName!= NULL comparison result is always NULL, therefore the entire WHERE clause output will be always FALSE. As a best SQL practice consider the nullable column values when we decide to use the NOT IN operator in the queries. What...
Practical SQL Query Interview Questions (SQL Server Queries examples with answers) In this part, we will see SQL practice questions which contain both complex SQL queries interview questions and basic SQL Interview Questions. Let’s see important SQL queries for interview ...
The UNION and UNION ALL operators both are used for combine the output of two or more SELECT queries, but they differ in handling duplicate rows: UNION: UNION operators combine the results of multiple SELECT queries and remove duplicate rows. It returns only distinct values across all queries....
Who should buy SQL Practice Problems? Data analysts who need to come up to speed on SQL Software developers who need to learn how to writeaccurate,efficient SQL People interviewing for jobs where they will be asked to write Select queries ...
These functions are useful for formatting and presenting text data in a consistent and readable manner in SQL queries and reports. What is a UNIQUE Key? SQL’s Unique Key ensures that a table’s column has only different values and no repeats. It’s a bit like a Primary Key but allows ...
or combination of tables. Users can write and execute queries to retrieve, delete or update information in a database. Usually, a query response returns data from different tables within the database, but this does not apply every time (for example, a delete query will not return anything)....
19. What is a SELECT statement used for?Hide Answer SELECT is a DML command used for fetching one or more tables. It queries for information which usually returns a set of results. 20. Name the clauses used in the SELECT statement.Hide Answer WHERE - filters the rows according to their...