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 (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. ...
Ans: Structured Query Language(SQL) is a language designed specifically for communicating with databases. SQL is an ANSI (American National Standards Institute) standard . What are the different type of SQL or different commands in SQL? Ans: Frequently asked SQL Interview Questions 1.DDL – Data ...
and the outer query is known as the main query in the Database. The implementation of subqueries is always done first, and the outcome of the following is always passed on to the main query.
DQL –Data Query Language– performs the query operations on the data within schema objects; DML –Data Manipulation Language– manipulate the data present in the database; DCL –Data Control Language– manages the database system’s rights, permissions, and other controls. ...
SQL,全称为Structured Query Language,也叫结构化查询语言,是用来操作数据库里数据的工具,具体来说SQL可以做数据查询、数据更新、数据写入等任务。 关于SQL和数据库的关系可以举一个非常形象的比喻,如果把数据库比作盘子,那数据就是盘子里的菜,SQL就是我们手里的筷子。 随着互联网线上业务的蓬勃开展,越来越多的经营...
Can you write a query that will help the owner of Cocoa Confections find the COUNT of all orders placed in 2016, by customer e-mail address, sorted descending? I've got an answer I need a hint Ace your SQL interview — Free mini-course Make sure you're prepared for the interview th...
big query here ) SELECT * FROM YourTable1 WHERE ID IN (SELECT ID FROM YourBigCTE) UNION SELECT * FROM YourTable2 WHERE ID IN (SELECT ID FROM YourBigCTE) Scope is next immediate select command. Can be used multiple times within the same CTE command, even recursively, and will last for...
article i will try to explain most important PL/SQL Interview Questions that may ask in interview.PL/SQL is the Procedural Language Structured Query Language which will use to add the business logic. In this article I will try to give the brief description about different PL/SQL interview ...
For example, the query below creates a packageemployee_pkgthat defines a procedure to raise an employee's salary and a function to retrieve the total number of employees, with their implementations to be provided in the package body. -- Create a package named 'employee_pkg'CREATEPACKAGE employe...