What are the basic SQL questions asked in interview?

What are the basic SQL questions asked in interview?

SQL Interview Questions

  • What is Database?
  • What is DBMS?
  • What is RDBMS?
  • What is SQL?
  • What is the difference between SQL and MySQL?
  • What are Tables and Fields?
  • What are Constraints in SQL?
  • What is a Primary Key?

What are the basic questions asked in interview of SQL Server Developer?

SQL Server database developer interview questions and answers

  • What are DMVs?
  • What are temp tables?
  • How are transactions used?
  • What is the difference between a clustered and a nonclustered index?
  • What are DBCC commands?
  • What is the difference between truncate and delete?
  • What does the NOLOCK query hint do?
  • What is a CTE?

How do I prepare for SQL Server DBA interview?

SQL Server DBA Interview questions and answers

  1. Tell me something about yourself and your experience in SQL Server?
  2. Brief me about your database environment like the number of instances, databases, biggest database size, etc.?
  3. Explain your backup and database maintenance strategy for your biggest critical OLTP database?

What is unique key in SQL interview questions?

In SQL Unique Key is a value that is unique for every record of the column in a table. The main job of the Unique Key is to allows you to place additional unique conditions on your columns.

Where can I practice SQL interview question?

SQLPad gives you everything you need to succeed in a SQL & Python/Pandas interview. Watch, learn and practice data interview coding questions all in your browser. Every question is thoughtfully designed in a business context. One-stop-shop to improve your data skills to a whole new level.

How many types of data files exist in SQL Server?

three types
SQL Server databases have three types of files, as shown in the following table. Contains startup information for the database and points to the other files in the database. Every database has one primary data file.

What is DBCC in SQL?

Microsoft SQL Server Database Console Commands (DBCC) are used for checking database integrity; performing maintenance operations on databases, tables, indexes, and filegroups; and collecting and displaying information during troubleshooting issues.

What are SQL data types?

Data types in SQL Server are organized into the following categories:

  • Exact numerics. Unicode character strings.
  • Approximate numerics. Binary strings.
  • Date and time. Other data types.
  • Character strings.
  • bigint. numeric.
  • bit. smallint.
  • decimal. smallmoney.
  • int. tinyint.

What is the full form of SQL?

Structured Query LanguageSQL / Full name
Structured Query Language (SQL) is a standardized programming language that is used to manage relational databases and perform various operations on the data in them.

What is schema in SQL?

What is Schema in SQL? In a SQL database, a schema is a list of logical structures of data. A database user owns the schema, which has the same name as the database manager. As of SQL Server 2005, a schema is an individual entity (container of objects) distinct from the user who constructs the object.

What is MDF and LDF file?

MDF stands for Main Database File and contains all the information in a database. LDF records all the transactions and changes to the database. The ldf is critical for disaster recovery.

Where are tables stored in SQL Server?

Physically, SQL Server tables are stored in ta database as a set of 8 KB pages. Table pages are stored by default in a single partition that resides in the PRIMARY default filegroup.

What is check DB?

Database Console Command CHECKDB (DBCC CHECKDB)is used to check the integrity (physical & logical) of objects in a SQL Server database. The command is supported in databases that contain memory-optimized tables but the validation is only supported in disk-based tables.

How many data types are there in SQL Server?

It has four kinds of data types. Below are the character string SQL server data types with examples. It is a character string with a fixed width.

What is DDL in SQL?

Data Definition Language (DDL) Statements Create, alter, and drop schema objects. Grant and revoke privileges and roles. Analyze information on a table, index, or cluster. Establish auditing options. Add comments to the data dictionary.

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.