In conclusion, we covered the top 100+ SQL interview questions and answers in this article that help you prepare and crack SQL jobs. We focused on covering essential concepts of SQL, like the basics of SQL quer
With a little bit of advance preparation, you’ll feel prepared and confident on interview day.Looking for interview questions specific to MySQL? Checkout our page on MySQL interview questions as well.New: Sign up for a free SQL mini-course Make sure you're prepared for the interview that ...
Partitioned tables in SQL are like breaking a big table into smaller pieces based on specific values in a chosen column, known as the partition key. This helps manage large datasets and speeds up queries. Each piece is called a partition and works like its own mini-table, making it easy ...
So, based on these two tables, let’s look into some of the questions related to SQL JOINS and queries. 94. Get customer name and product name order by first name from SELECT a.first_name,b.Product_name FROM [customer] A INNER JOIN [product] B ON A.customer_id = B.customer_id OR...
BEGIN: The executable section where SQL queries and procedural statements are written. EXCEPTION(Optional): Handles runtime errors and exceptions to ensure graceful error recovery. END;: Marks the end of the block. 3. What are the essential PL/SQL data types?
The INTERSECT returns the rows that are returned by both of the queries. 30. What does the COALESCE function do? The COALESCE function takes several parameters, evaluates them in sequence, and returns the first non-null argument. For example, given the following query: ...
a. Write down pseudo-code or implementation steps before writing queries b. Write the query first and explain all the logic after at the end. Of course, let the interviewer know it in advance, so they know what to expect. 5.Use the SQL language you are good at!
Focus areas: understanding SQL, basic SQL syntax, and simple queries (SELECT, INSERT, UPDATE, DELETE). Resources: Introductory courses, beginner tutorials, and hands-on practice with small datasets. Outcome: Ability to perform basic data retrieval and manipulation tasks. Intermediate level (1-3 mon...
Write the code for the following SQL queries: a) Build the query that will show unique Customer IDs of customers who received 'PromA', but didn't receive 'PromB'. b) Build the query that will show the number of customers who received each ...
Whether your project’s infrastructure is already established or you’re strategically planning the inclusion of a new DBMS, an engineer with extensive SQL skills can help an app achieve optimal performance. They can also mentor developers to write better queries in line with best practices. ...