Landing a job that requires SQL skills often means preparing for a challenging interview. SQL is a foundational technology for database management, so employers test candidates on various concepts ranging from basic to advanced-level queries. This blog covers common SQL interview questions and their ...
A trigger is a SQL procedure that initiates an action when an event (INSERT, DELETE or UPDATE) occurs. Triggers are stored in and managed by the DBMS.Triggers are used to maintain the referential integrity of data by changing the data in a systematic fashion. A trigger cannot be called o...
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...
1. Make a note of all node names (and/or IP addresses), SQL Server virtual names along with preferred nodes. If there are more than three nodes you may need to also take note of possible owners for each SQL resource group. For my example assume that I have a cluster with node1 and...
name given to a table or column which do not exist once the SQL statement is executed. Q. What is a view ? A view is a virtual table based on one or more tables. Why Use views ? To restrict data access • To make complex queries easy ...
Following are some important Interview Questions for SQL : 1.What is SQL?Where SQL is used? Answer: SQL is Structured Query Language, which is a computer language for storing, manipulating and retrieving data stored in relational database.SQL can be used in different languages or database manag...
This guide lists out a few of the most asked SQL interview questions and gives their answers such as JOINS, KEYWORDS, TRIGGERS and much more.Lokesh Gupta September 12, 2022 Interview Questions Interview Questions, SQL SQL is the standard language for retrieving, updating, inserting and deleting...
Q1. What are the most important SQL Join topics to prepare for SQL interview? Questions asked in SQL interviews are based on SQL Join topics – Joining Tables & Queries, Inner Join, Left Outer Join, Right Outer Join, Full Outer Join, Cross Join, Union, and Union All. There is a ...
10.What is mean by Unique Indexes?(90% asked PL SQL Interview Questions) Answer: 1.To create unique index you must have CREATE ANY INDEX privilege.Here the concept is bit different.User needs to check the values of the table to create unique index.If table contains uniquely identified value...
8. How are INSERT, UPDATE, and DELETE used in SQL databases? SELECT queries are useful, but they only allow you to query data — in other words, they only let you ask questions about data that already exists. But what if you want to manipulate your database — by creating new data,...