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SQL SubQuery SQL CASE Commit and Rollback in SQL Pattern Matching in SQL DDL Commands in SQL DML Commands in SQL Types of SQL Commands SQL COUNT SQL Primary Key SQL FOREIGN KEY SET Operators in SQL Check Constraint in SQL SQL EXCEPT SQL VIEW SQL WHERE Statement SQL CRUD Operation Where Condition in SQL TCL Commands in SQL Types of SQL JOINS SQL Nth Highest Salary SQL NOT OPERATOR SQL UNION ALL SQL INTERSECT SQL Data Definition Language SQL Data Manipulation Language SQL Data Control Language SQL CONSTRAINTS SQL Aggregate Operators SQL KEYS Codd’s Rules in SQL What is SQL Injection? Trigger In SQL SQL WHERE Multiple Conditions Truncate function in SQL SQL Formatter WEB SQL SQL Auto Increment Save Point in SQL space() function in SQL SQL Aggregate Functions SQL Topological Sorting SQL Injection SQL Cloning Tables SQL Aliases SQL Handling Duplicate Update Query in SQL Grant Command in SQL SQL SET Keyword SQL Order BY LIMIT SQL Order BY RANDOM

How To

How to use the BETWEEN operator in SQL How To Use INNER JOIN In SQL How to use LIKE in SQL How to use HAVING Clause in SQL How to use GROUP BY Clause in SQL How To Remove Duplicates In SQL How To Delete A Row In SQL How to add column in table in SQL ? How to drop a column in SQL? How to create a database in SQL? How to use COUNT in SQL? How to Create Temporary Table in SQL? How to Add Foreign Key in SQL? How to Add Comments in SQL? How To Use Group By Clause In SQL How To Use Having Clause In SQL How To Delete Column In Table How To Compare Date In SQL How index works in SQL How to calculate age from Date of Birth in SQL How to Rename Column name in SQL
SQL Data Control Language
2018-10-28 10:36:53

SQL Data Control Language

Data Control Language decides to whom should (which user) permit access privileges.

GRANT and REVOKE are the commands of DCL.

GRANT: It gives privileges to user.

REVOKE: It takes back privileges from granted user.

Data Query Language

Data Query Language does not make any changes in database. Neither schema level nor data level.
SELECT is a command of DQL.

SELECT: Retrieves data /records from table.

Syntax:

SELECT Column_1, Column 2, …..
FROM  Table_name
[WHERE condition];

Example:

  1. Select Student_id , Student_name
From Student Where Student_id=’10’;
  1. Select Student_id , Student_name From Student;

Syntax:

SELECT * FROM  Table_name [WHERE condition];

Example:

Select  * From  Student where Student_id=’10’;

  • This query retrieves single record with all its attributes/columns.
  • ‘* ‘Indicates all the fields/attributes/columns in the table.
  • Where condition is specified for a particular record.

Syntax:

SELECT * FROM  Table_name;

Example:

SELECT * FROM STUDENT;

It will retrieve all records and all the columns from the table.

Where condition is not specified to fetch a particular record.