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...
SQL Interview Question 面试的时候发现会问一些SQL的基本问题,在此总结一下。 ProgramInterview/SQL这个网站上的问题还比较全。 1. Join type INNER JOIN: Returns all rows when there is at least one match in BOTH tables LEFT JOIN: Return all rows from the left table, and the matched rows from the...
SQL (Structured Query Language) Interview Questions And AnswersSharpen your SQL interview expertise with our handpicked 172 questions. Each question is crafted to challenge your understanding and proficiency in SQL. Suitable for all skill levels, these questions are essential for effective preparation. ...
Structured Query Language is the main part of the relational database, which can be utilized for gaining access to the database and also plays a major role in the management of the database. On the other hand, MySQL is a Relational Database Management System like SQL Server, Informix, and...
SQL commands There are five main categories for the SQL commands: DDL –Data Definition Language– defines and alters the database schema; DQL –Data Query Language– performs the query operations on the data within schema objects; DML –Data Manipulation Language– manipulate the data present in...
Eventually, in an outer query, apply a WHERE filter and a COUNT() function on the result of the subquery. Solution of SQL Interview Question #3 Solution: SELECT department_name, AVG(salaries.salary) AS avg_salaries FROM employees JOIN salaries ON employees.employee_id = salaries.employee_id ...
SQL Server books online has enough information on this topic and there is a good white paper available on Microsoft site. 12. Explain the architecture of SQL Server This is a very important question and you better be able to answer it if consider yourself a DBA. SQL Server books online is...
Best Interview Question Database PostgreSQL Interview Questionsand Answers PostgreSQL Interview Questions 1. What is PostgreSQL and why it is used for? 2. What are the features of PostgreSQL? 3. How to install PostgreSQL on windows? 4. How to install PostgreSQL on Ubuntu? 5. List data type ...
In my previous articles I have explained theSQL interview questions ,BI Interview questionswhich will give the best idea about the question that may ask in interview. In this article i will try to explain most important PL/SQL Interview Questions that may ask in interview.PL/SQL is the Proced...
4. How to find the query running on a given SPID? 5. What is XACT_ABORT ON? 6. Can we use two CTE’s in a single select query? 7. What are the different join operators in SQL Server? 8. Can we use a table variable inside a nested stored procedure if the table variable created...