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What are the interview questions in SQL Server?

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What are the interview questions in SQL Server?

SQL Server Interview Questions

  1. How to create a database in SQL Server? A database is an organized file of data.
  2. What is SQL?
  3. What is PL/SQL?
  4. What is the difference between SQL and PL/SQL?
  5. What is RDBMS?
  6. What is a database table?
  7. How do you create a table in SQL?
  8. How to delete a table in SQL Server?

What is Transact SQL used for?

T-SQL or Transact SQL is the query language specific to the Microsoft SQL Server product. It can help perform operations like retrieving the data from a single row, inserting new rows, and retrieving multiple rows. It is a procedural language that is used by the SQL Server.

What is T-SQL example?

T-SQL (Transact-SQL) is a set of programming extensions from Sybase and Microsoft that add several features to the Structured Query Language (SQL), including transaction control, exception and error handling, row processing and declared variables.

What is CTE in SQL Server interview questions?

A Common Table Expression (CTE) is an expression that can be thought of as a temporary result set which is defined within the execution of a single SQL statement. A CTE is similar to a derived table in that it is not stored as an object and lasts only for the duration of the query.

How do I prepare for SQL interview?

Next steps: Preparing for your SQL interview

  1. Retrieve Data using Single-Table SQL Queries.
  2. Retrieve Data with Multiple-Table SQL Queries.
  3. Querying Databases Using SQL SELECT statement.
  4. Aggregate Data in SQL using MySQL Workbench.
  5. Mastering SQL Joins.
  6. SQL CASE Statements.

What is difference between T-SQL and SQL?

The obvious difference is in what they are designed for: SQL is a​ query language used for manipulating data stored in a database. T-SQL is also a query language, but it’s an extension of SQL that is primarily used in Microsoft SQL Server databases and software.

What are the features of T-SQL?

Below are some major features.

  • Procedural programming.
  • Various computational, scalar and mathematical support functions.
  • Data manipulation commands with FROM clause that can be used along with Join operations.
  • BULK INSERT functionality to import large data file.

What is T-SQL in stored procedure?

Introduction. Stored procedures are a collection of Transact-SQL statements stored within the database. They are used to encapsulate oft-used queries, such as conditional statements, loops, and other powerful programming features.

How do I find missing indexes in SQL Server?

To determine which missing index groups a particular missing index is part of, you can query the sys. dm_db_missing_index_groups dynamic management view by equijoining it with sys. dm_db_missing_index_details based on the index_handle column. The result set for this DMV is limited to 600 rows.

Can we use CTE in stored procedure?

According to the CTE documentation, Common Table Expression is a temporary result set or a table in which we can do CREATE, UPDATE, DELETE but only within that scope. That is, if we create the CTE in a Stored Procedure, we can’t use it in another Stored Procedure.

What are the types of SQL?

Types of SQL Statements

  • Data Definition Language (DDL) Statements.
  • Data Manipulation Language (DML) Statements.
  • Transaction Control Statements.
  • Session Control Statements.
  • System Control Statement.
  • Embedded SQL Statements.

Why is it called T-SQL?

T-SQL, which stands for Transact-SQL and is sometimes referred to as TSQL, is an extension of the SQL language used primarily within Microsoft SQL Server. This means that it provides all the functionality of SQL but with some added extras.

Is T-SQL procedural language?

SQL (Structured Query Language) is a standard language used in managing data in almost all relational database management systems (RDBMS) such as PostgreSQL, MySQL, SQL Server, Oracle, DB2, Informix, etc. TSQL is a proprietary procedural language used by Microsoft SQL Server.

How do I merge two stored procedures?

  1. Declare one table variable for Stored Procedure 1.
  2. Declare another table variable for Stored Procedure 2.
  3. Declare third table variable which consists of all columns, table1 and table2 and use UNION to populate it as:

What are cursors in SQL?

A cursor in SQL is a temporary work area created in system memory when a SQL statement is executed. A SQL cursor is a set of rows together with a pointer that identifies a current row. It is a database object to retrieve data from a result set one row at a time.

How do you drop an index?

The DROP INDEX command is used to delete an index in a table.

  1. MS Access: DROP INDEX index_name ON table_name;
  2. SQL Server: DROP INDEX table_name.index_name;
  3. DB2/Oracle: DROP INDEX index_name;
  4. MySQL: ALTER TABLE table_name. DROP INDEX index_name;

What are duplicate indexes in SQL Server?

Duplicate indexes take up double the room in SQL Server– and even if indexes are COMPLETELY identical, SQL Server may choose to use both of them. Duplicate indexes essentially cost you extra IO, CPU, and Memory, just the things you were trying to SAVE by adding nonclustered indexes!

Why should you choose SQL Server 2008 for your career?

When you’re interviewing for a new position, you should come prepared to answer the interview questions to win in first attempt. SQL Server 2008 features a number of enhancements, such as multiple installations and distributed partitions, which will make your admin chores easier Having expertise in SQL Server will place you a good career.

What are the features of SQL Server 2008?

SQL Server 2008 features a number of enhancements, such as multiple installations and distributed partitions, which will make your admin chores easier Having expertise in SQL Server will place you a good career. SQL Server 2008 is developed by Microsoft. It aims at managing the relational databases with functionalities like storing and retrieving.

How would you handle error in SQL Server 2008?

How Would You Handle Error In Sql Server 2008? SQL Server now supports the use of TRY…CATCH constructs for providing rich error handling. TRY…CATCH lets us build error handling at the level we need, in the way we need to, by setting a region where if any error occurs, it will break out of the region and head to an error handler.

What is a table scan SQL Server?

In a table scan SQL Server examines every row in the table to satisfy the query results. Table scans are sometimes unavoidable, but on large tables, scans have a terrific impact on performance. Question 19. What Is A Linked Server?