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Downlaod PL/SQL Interview Questions and Answers PDF free | Download Free PDF Files
SQL knowledge is usually basic knowledge required for almost all database related technical jobs. Therefore it is good to know some SQL Interview questions and blogger.com post will mainly contain "generic" SQL questions and will focus on questions that allow testing the candidate's knowledge about sql itself but also logical thinking.1/5(1). SQL for SQL Server, Oracle, DB2, MySQL, Teradata, PostgreSQL, Sybase, Interview Questions and Answers PDF Download by Industry Experts, Practical Scenarios. This article is to provide complete SQL Interview Questions & Answers Pdf which will be helpful for the students who attend the interview.
Sql interview questions pdf free download
You got the interview! Answering these questions is very easy if you follow the link. It contains sample answers for both freshers and experienced.
What is a Database? A database is a collection of information in an organized form for faster and better access, storage and manipulation. It can also be defined as a collection of tables, schema, views, and other database objects.
What is Data warehouse? Data warehouse refers to a central repository of data from multiple sources of information. Those data are consolidated, transformed and made available for the mining as well as online processing.
What is a Table in a Database? A table is a database object used to store records in a field in the form of columns and rows that holds data. What is a Field in a Database?
Sql interview questions pdf free download is a Record in a Database? A record also called a row of data is an ordered set of related data in a table. What is a column in a Table? A column is a vertical entity in a table that contains all information associated with a specific field in a table. What is DBMS? Database Management System is a collection sql interview questions pdf free download programs that enables a user to store, retrieve, update and delete information from a database.
What are the types of DBMS? There are two types of DBMS 1. Non-Relational Database Management System, sql interview questions pdf free download. What is SQL? What are the different types of SQL commands?
SQL commands are segregated into the following types:, sql interview questions pdf free download. DDL commands are used to define or alter the sql interview questions pdf free download of the database. DML commands are used for managing data present in the database. DCL commands are used to create roles, grant permission and control access to the database objects, sql interview questions pdf free download.
What is an Index? An index is used to speed up the performance of queries. It makes faster retrieval of data from the table. The index can be created on one column or a group of columns. What are all the different types of indexes? There are three types of indexes 1. Unique Index: Unique Indexes helps maintain data integrity by ensuring that no two rows of data in a table have identical key values. A unique index can be applied automatically when a primary key is defined. It ensures that the values in the index key columns are unique.
Clustered Index: Clustered Index reorders the physical order of the table and search based on the key values. There will be only one clustered index per table. Each table can have many non-clustered indexes. What is the difference between Cluster and Non-Cluster Index? The difference between the clustered and non-clustered index in SQL is as follows: Clustered Index: It is used for easy retrieval of data from the database and it is faster. One table can only have one clustered index It alters the way records are stored in a database as it sorts out rows by the column which is set to be sql interview questions pdf free download index.
Non-Clustered Index: It is slower compared to the Clustered index. What is a View? A view is like a subset of a table which is stored logically in a database. A view is a virtual table. It contains rows and columns similar to a real table. The fields in the view are fields from one or more real tables. Views do not contain data of their own. They are used to restrict access to the database or to hide data complexity. What is a relationship and what are they?
Database Relationship is defined as the connection between the tables in a database. There are various database relationships namely 1.
One to One Relationship 2. One to Many Relationship 3. Many to One Relationship 4. Self-Referencing Relationship. What is a query? A database query is a request for data or information from a database table or combination of tables. A database query can be either a select query or an action query. What is a Subquery? A Subquery is a SQL query within another query. It is a subset of a Select statement whose return values are used in filtering the conditions of the main query.
What are the types of subquery? There are two types of subquery: 1. Correlated: In a SQL database query, a correlated subquery is a subquery that uses values from the outer query in order to complete. Because a correlated subquery requires the outer query to be executed first, the correlated subquery must run once for every row in the outer query. It is also known as a synchronized subquery. Non-Correlated: A Non-correlated subquery is a subquery in which both outer query and inner query are independent to each other.
What is the difference between Local Variables and Global Variables? Local Variables: Local variables can be used or exist only inside the function. These variables are not used or referred by any other functions. These are not known to other functions. Variables can be created whenever that function is called. Global Variables: Global variables can be used or exist throughout the program.
Same variable declared in global cannot be used in functions. Global variables cannot be created whenever that function is called.
What is data Integrity? Data integrity defines the accuracy and consistency of the data stored in a database. It also defines integrity constraints to enforce business rules on the data when it is entered into an application or a database.
Sql interview questions pdf free download increment keyword allows the user to create a unique number to get generated when a new record is inserted into a table. Auto increment keyword can be used whenever Primary Key is used.
What is a temp table? A temp table is a temporary storage structure to store the data temporarily. It eliminates all the duplicated values. View Detailed Post. Join is a query, which retrieves related columns or rows from multiple tables. What is the difference between an inner and outer join? An outer join returns rows from both tables that include the records that are unmatched from one or both the tables.
What are SQL constraints? SQL constraints are the set of rules that enforced some restriction while inserting, deleting or updating of data in the databases. What are the constraints available in SQL? What is a Unique constraint? What is a Primary Key? What is a NULL value? A field with a NULL value is a field with no value.
A NULL value is different from a zero value or a field that contains spaces. A field with a NULL value is one that has been left blank during record creation, sql interview questions pdf free download. Assume, there is a field in a table is optional and it is possible to insert a record without adding a value to the optional field then the field will be saved with a NULL value.
TOP 23 SQL INTERVIEW QUESTIONS & ANSWERS! (SQL Interview Tips + How to PASS an SQL interview!)
, time: 18:31Sql interview questions pdf free download
Are you preparing for your sql developer interview? Then you have come to the right place. This guide will help you to brush up your SQL skills, regain your confidence and be job ready! In this guide you will find a collection of real world SQL interview questions asked in companies like Google, Oracle, Amazon and Microsoft etc. Aug 24, · After clicking the below "Download Oracle PL-SQL Interview Questions" button you must have to stay for a couple of seconds to process and complete your request. Content of these documents are copy right protected. On social networking if you are sharing stuff of this site or documents then you have to credit back to us with sharing our link. SQL for SQL Server, Oracle, DB2, MySQL, Teradata, PostgreSQL, Sybase, Interview Questions and Answers PDF Download by Industry Experts, Practical Scenarios.
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