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What is SQL explain with example?

What is SQL explain with example?

An SQL SELECT statement retrieves records from a database table according to clauses (for example, FROM and WHERE ) that specify criteria. The syntax is: SELECT column1, column2 FROM table1, table2 WHERE column2=’value’;

What is SQL note?

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 are the examples of SQL commands?

Some of The Most Important SQL Commands

  • SELECT – extracts data from a database.
  • UPDATE – updates data in a database.
  • DELETE – deletes data from a database.
  • INSERT INTO – inserts new data into a database.
  • CREATE DATABASE – creates a new database.
  • ALTER DATABASE – modifies a database.
  • CREATE TABLE – creates a new table.

What are the 5 types of SQL commands?

There are five types of SQL commands: DDL, DML, DCL, TCL, and DQL….Types of SQL Commands

  • Data Definition Language (DDL)
  • Data Manipulation Language.
  • Data Control Language.
  • Transaction Control Language.
  • Data Query Language.

What is SQL and different types of SQL?

SQL stands for Structured Query Language, as it is the special purpose domain-specific language for querying data in Relational Database Management System (RDBMS). Microsoft SQL Server, MySQL, Oracle, etc. use SQL for querying with slight syntax differences.

What are the functions in SQL?

Aggregate SQL Functions

Function Description
SUM() Used to return the sum of a group of values.
COUNT() Returns the number of rows either based on a condition, or without a condition.
AVG() Used to calculate the average value of a numeric column.
MIN() This function returns the minimum value of a column.

What are features of SQL?

Features of SQL

  • Data Definition Language(DDL): SQL provides many commands, one of which is Data Definition Language(DDL).
  • Data Manipulation Language(DML)
  • Relational Foundation.
  • High-performance.
  • Scalability.
  • Security and authentication.
  • Vendor Independence.
  • Portability across different computer systems.

What is DDL in SQL?

Data definition language (DDL) statements let you to perform these tasks: Create, alter, and drop schema objects. Grant and revoke privileges and roles. Analyze information on a table, index, or cluster.

What are the two types of SQL?

The lists in the following sections provide a functional summary of SQL statements and are divided into these categories: Data Definition Language (DDL) Statements. Data Manipulation Language (DML) Statements.

What are SQL functions and types?

There are three types of user-defined functions in SQL Server:

  • Scalar Functions (Returns A Single Value)
  • Inline Table Valued Functions (Contains a single TSQL statement and returns a Table Set)
  • Multi-Statement Table Valued Functions (Contains multiple TSQL statements and returns Table Set)
  • October 20, 2022

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