Top 60 Advanced SQL Interview Questions And Answers Pdf, You can crack the interview to achieve your raudone.info Provide Tutorial Videos Scenario based. SQL Interview Questions with Answers A stored procedure is a named group of SQL statements that have been previously created and stored in the server. SQL Questions and Answers | SQL Interview Questions and Answers PDF | SQL Interview Questions | SQL Technical Interview Question & Answers | SQL.
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Frequently asked SQL Interview Questions with detailed answers and examples. answers are given just below to them and for sql server question and answers visit "SQL server Interview Questions". .. How to store pdf file in SQL Server?. SQL Interview Questions for developers. We cover basic & advanced SQL Server Interview Questions and Answers. Read to crack SQL. If you're looking for SQL Interview Questions for Experienced or Freshers, you are at right place. There are lot of opportunities from many reputed companies in.
Top 60 Advanced SQL Interview Questions And Answers Pdf
When would you use it? How would you view the execution plan?
Execution plans are very useful for helping a developer understand and analyze the performance characteristics of a query or stored procedure, since the plan is used to execute the query or stored procedure. If this option is turned on, it will display query execution plans in a separate window when a query is run.
List and explain each of the ACID properties that collectively guarantee that database transactions are processed reliably.
They are defined as follows: Atomicity.
An atomic system must guarantee atomicity in each and every situation, including power failures, errors, and crashes. The consistency property ensures that any transaction will bring the database from one valid state to another. Any data written to the database must be valid according to all defined rules, including constraints, cascades, triggers, and any combination thereof. The isolation property ensures that the concurrent execution of transactions results in a system state that would be obtained if transactions were executed serially, i.
Providing isolation is the main goal of concurrency control.
Depending on concurrency control method i. Durability means that once a transaction has been committed, it will remain so, even in the event of power loss, crashes, or errors. In a relational database, for instance, once a group of SQL statements execute, the results need to be stored permanently even if the database crashes immediately thereafter.
To defend against power loss, transactions or their effects must be recorded in a non-volatile memory.
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Given a table dbo. All the odd number records? How do they differ? RAID stands for Redundant array of independent disks which was earlier called as Redundant array of inexpensive disks. It is a storage technology that has one logical unit consisting of multiple disk drive components.
It increases the performance by replicating and dividing the data through many levels between multiple physical drives. There are 12 Raid Levels which are as follows: - Level 0: it is a 'striped' disk array provides data stripping without fault tolerance.
Multiple mirrors are created and then stripes over it. Due to this values in the unique key columns may or may not be NULL. What is bit data type and what's the information that can be stored inside a bit column?
It is used to store the boolean information of the form 1 true or 0 false. Define candidate key, alternate key, and composite key. It identifies each row of a table as unique. It can become the primary key of the table as well.
Every tabular relationship will have atleast one candidate key. Unique keys also termed as alternate keys which prevent incorrect data from entering the table. This gives assurance of uniqueness of data when the columns are joined together.
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ACID is used in database and it includes the following properties such as atomicity, consistency, isolation and durability. These properties allow easy, reliable and secure database transaction. Example: Transfer of money from one bank account to another. It is used to manage the concurrency in the database table. What is the difference between Locking and multi-versioning?
Locking is a means of not allowing any other transaction to take place when one is already in progress. In this the data is locked and there wont be any modification taking place till the transaction either gets successful or it fails. The lock has to be put up before the processing of the data whereas Multi-versioning is an alternate to locking to control the concurrency.
SQL Interview Questions
It provides easy way to view and modify the data. It allows two users to view and read the data till the transaction is in progress. Explain different forms of normalization?September 20, at What is an Index? Yes we can configure the mirroring between two different SQL server versions. Q27 What do you know about the stored procedure? There are many ways to find second highest salary of Employees in SQ. You also have to be aware of different time zones and server time zone. Database Relationship is defined as the connection between the tables in a database.
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