Scenario-Based SQL Interview Questions The Bottom Line Top SQL Interview Questions List for 2025 SQL is a common language for Structured Query Language, which is based on general English, whereas MySQL is a database management system. Structured Query Language is the main part of the relational d...
Write a query to fetch values in table test_a that are and not in test_b without using the NOT keyword. Note, Oracle does not support the above INSERT syntax, so you would need this instead: insert into test_a(id) values (10); insert into test_a(id) values (20); insert into te...
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 Unique key constraint uniquely identified e...
SQL Job Interview Questions and Answers 1 :: What is SQL (Structured Query Language)? SQL is an English like language consisting of commands to store, retrieve, maintain & regulate access to your database.Read More 2 :: What is the SQL*Plus? SQL*Plus is an application that recognizes &...
Solution of SQL Interview Question #2 The solution SQL query is: SELECT COUNT(*) FROM(SELECT user_id, COUNT(event_date_time) AS image_countFROM event_logGROUP BY user_id) AS image_per_userWHERE image_count < 2000 AND image_count > 1000; ...
Self join is just like any other join, except that two instances of the same table will be joined in the query. Here is an example: Employees table which contains rows for normal employees as well as managers. So, to find out the managers of all the employees, you need a self join....
Is visible to the current query only Global Temp Table: “CREATE TABLE ##TempTable” This differs from a #temp table in that it is visible to all processes. When the creating process ends, the table is removed (but will wait until any current activity from other processes is done). ...
A view is a virtual table based on aSELECTquery that can join and simplify complex queries, encapsulate logic, and provide a layer of abstraction. Views enhance security by restricting access to underlying tables, simplify data access, and present a consistent, unchanging schema even if the under...
5. What is index in SQL? (90 % asked in every Interview Questions For SQL) Answer: “Index is optional structure associated with the table which may or may not improve the performance of Query” Indexes in SQL “In simple words suppose we want to search the topic in to book we go to...
Here are some e-commerce SQL interview questions: 1.Product Catalog Query: Write an SQL query to retrieve the names and prices of all products in the product catalog. 2.Order Summary Query: Create an SQL query to calculate the total revenue generated from orders placed in the last month. ...