These questions include SQL interview questions for freshers and experienced, as well as SQL query interview questions. 1. What is the difference between a primary key and a unique key? 2. What is a constraint, and why use constraints? 3. What is the COALESCE function? 4. What are UNION...
Example: SQL Server. 3. What is SQL? SQL stands for Structured Query Language , and it is used to communicate with the Database. This is a standard language used to perform tasks such as retrieval, updation, insertion and deletion of data from a database. 7. What is a unique key? A...
Evidently, the demand for T SQL professionals is quite high and so is the competition. We assure you that once you go through this blog, you will get an idea of how to go about the interview. For making the entire process a whole lot easier, we have divided the questions into three c...
The questions and answers are covered using every detail possible and they also contain queries as and where necessary. This ensures that you learn every bit of it and be well-prepared for the interview. To begin with, we will cover the basic concepts about SQL. Further, we will move towar...
Write a SQL query using UNION ALL (not UNION) that uses the WHERE clause to eliminate duplicates. Why might you want to do this? View answer You can avoid duplicates using UNION ALL and still run much faster than UNION DISTINCT (which is actually same as UNION) by running a query like...
Check out the 50 most-asked SQL query interview questions. 50 QuestionsSQL Queries for Practice Q:-1. What is SQL Query Optimization? Ans.Query Optimization is the process of writing the query in a way that it could execute quickly. It is a significant step for any standard application. ...
These questions include SQL interview questions for freshers and experienced, as well as SQL query interview questions. 1. What is the difference between a primary key and a unique key? 2. What is a constraint, and why use constraints? 3. What is the COALESCE function? 4. What are UNION...
Are you preparing for your SQL developer interview? In this blog post, we will take a look at some of the most common sql query interview questions and give you some tips on how to answer them. So, whether you’re just starting out in your career or you’re preparing for an interview...
Intermediate SQL interview questions with detailed answers: 11. Find Customer Order Counts Question: Write a query to list customers who have placed more than 5 orders. Use the customers and orders tables. Answer: SELECT c.customer_id, c.customer_name, COUNT(o.order_id) AS order_count ...
Structured Query Language (SQL) is the standard programming language used by database administrators and data analysts to query databases. It is widely used in the programming languages of websites, apps, and other platforms. It is used to access and manipulate data in a database, including cre...