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.
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 &...
SQL Interview Questions http://career.guru99.com/top-50-sql-question-answers/ 1. What is DBMS? A Database Management System (DBMS) is a program that controls creation, maintenance and use of a database. DBMS can be termed as File Manager that manages data in a database rather than savi...
The Microsoft SQL Server max degree of parallelism (MAXDOP) configuration option controls the number of processors that are used for the execution of a query in a parallel plan. This option determines the computing and threads resources that are used for the query plan operators that perform the ...
Sonawane Lalit · Posted a month ago in Questions & Answers arrow_drop_up5more_vert 15+ interview SQL questions, including both technical and non-technical questions, along with their answers. What is SQL? - Answer: SQL (Structured Query Language) is a standard programming language specifical...
You can avoid duplicates using UNION ALL and still run much faster than UNION DISTINCT (which is actually same as UNION) by running a query like this: SELECT * FROM mytable WHERE a=X UNION ALL SELECT * FROM mytable WHERE b=Y AND a!=X The key is the AND a!=X part. This gives ...
Linked Servers is a concept in SQL Server by which we can add other SQL Server to a Group and query both the SQL Server dbs using T-SQL Statements. With a linked server, you can create very clean, easy to follow, SQL statements that allow remote data to be retrieved, joined and combi...
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. When we talk about ORMs, we usually refer to alibrarythat implements the Object-Relational Mapping technique, hence the phrase “an ORM...
Prepare with basic and advanced PL/SQL interview questions and answers, covering topics like functions, triggers, dynamic SQL, and error handling.
Softwaretesting-QuestionsandAnswers-SQLInterviewQuestions Q.WhatdoesSQLstandfor? A.StructuredQueryLanguage Q.Whatisaprimarykey? A.Primarykey:EachrowofthedatainatableuniquelyidentifiedbyaPrimaryKey Thecolumn(columns)thathascompletelyuniquedatathroughoutthetableis ...