This function is used in Oracle, not in SQL and MySQL. Instead of NVL() function, MySQL have IFNULL() and SQL Server have ISNULL() function.55) Which function is used to return remainder in a division operator in SQL?The MOD function returns the remainder in a division operation.56) ...
PostgreSQL Interview Questions and Answers SQL Server Interview Questions and Answers MySQL Interview Questions DB2 Interview Questions and Answers PL/SQL Interview Questions and Answers Oracle DBA Interview Questions and Answers SQL Interview Questions and Answers Top 35 Database Testing Interview Questions ...
interact with any database like ORACLE, SQL ,MYSQL etc. SQL is easy to learn. The statements are all made up of descriptive English words, and there aren't that many of them. SQL is actually a very powerful language and by using its language elements you can perform very complex and so...
In this article, you will learn many simple and complex SQL queries asked in IT interviews. Let's take two tables which help in solving various queries. The name of the first table isStudent,and the name of the second table isSubject. The Student table consists ofStudent_ID, Stu_Name, ...
Practical SQL Interview Questions and Answers 如果在国内打不开这些网站,或者阅读英文吃力的话,还是建议看《SQL21日自学通》。 SQL 中的子句【必考】 子句和JOIN是必考的,但是说由于表的联合相关的学习资料实在是太多了,都快说吐了,在此就不赘述了。一般面试中,SELECT之后应该是FROM,在每次输入SELECT语句时FROM也...
Unlike MySQL, PostgreSQL is an object-relational database that supports advanced data types like objects, arrays, and XML. This makes it more intuitive and versatile for developers. Below is the tabular form to make it more clear. Discuss the difference between NoSQL and SQL. ...
Prepare yourself for the industry by going through these Top MySQL Interview Questions and Answers!15. What is MERGE JOIN? MERGE JOIN is the most important join in SQL Server. In MERGE JOIN, your query plan is an effective query plan and you don’t need to make many changes to improve ...
It is also a core element of the open-source technology stack, LAMP (Linux, Apache, MySQL, and PHP). MySQL offers a multi-user access to databases. Checkout: MySQL Interview Questions & Answers In-Demand Software Development Skills JavaScript Courses Core Java Courses Data Structures Courses ...
A few popular examples are MySQL, PostgreSQL, Microsoft Access, SQL Server, FileMaker, and Oracle. 3. What is Object-Relational Mapping? Object-Relational Mapping (ORM)is a tool that lets you query and manipulates data from a database using an object-oriented programming language such as Java...
If you need more clarification on how to approach this data analyst interview question, my team and I prepared a walkthrough video that might help. Question #2: Trips and Users (MySQL) “Thecancellation rateis computed by dividing the number of canceled (by client or driver) requests with ...