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. ...
Explanation:This query joins the customers and orders tables on customer_id. It groups by customer_id and customer_name, then counts the number of orders for each customer. The HAVING clause filters the results to show customers with more than 5 orders. 2. Aggregate Functions with GROUP BY ...
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 &...
7. What is a Query? A query, in SQL, is a command used to request data or update information from a database table 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...
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...
One of my favorite interview questions that tips even seasoned SQL guys (maybe because it's too simple) is around querying data that involves a self join. Question: Given an Employee table which has 3 fields - Id (Primary key), Salary and Manager Id, where manager id is ...
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PL/SQL: It is referred as Procedure Language / Structure Query Language:• In PL/SQL you can execute a block of code not a single line of code.• Deep control statements• It can run in UNIX also.• PL/SQL language includes object oriented programming techniques such as encapsulation...
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; ...