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SQL Tutorial

SQL (Structured Query Language) is a standard computer language that is used to access and manipulate databases.

In our SQL tutorial you will learn the basics of SQL and its use in database management systems like Oracle, Sybase, SQL Server, DB2, Access, and others.


 
 
     SQL TOPICS
SQL Introduction
SQL (Structured Query Language) is a widely used database language, providing means of data manipulation (store, r...more »
SQL Introduction
   
SQL Select
The SELECT statement is used to retrieve data from a table. The general form is as under. Synt...more »
SQL Select
   
SQL Where Clause
In Select Query we use WHERE clause to select only data that matches a specified criteria. ...more »
SQL Where Clause
   
SQL Distinct
The SQL DISTINCT command is used along with the SELECT statement. It retrieves only unique data entries depending on the column list you have specified after it. Here is ...more »
SQL Distinct
   
SQL AND Operator
The AND operator displays a record if all the conditions are true. It links together two or more conditional statements for increased filtering when running SQL commands. ...more »
SQL AND Operator
   
SQL OR Operator
The OR operator displays a record if one of the conditions is true. an Or condition just asks SQL to look for 2 separate conditions within the same query and return any records ma...more »
SQL OR Operator
   
SQL Order By
The Order By keyword is used to sort the result-set of select statement by a specified column name. It will sort the records in ascending or descending order. By default it sorts ...more »
SQL Order By
   
SQL Insert
The INSERT statement allows you to insert a single record or multiple records into a table. The general syntax is as under. Syntax 1: ...more »
SQL Insert
   
SQL Update
The Update command is used to make changes to records in tables. The general syntax is as under. Syntax: UPDATE table_name...more »
SQL Update
   
SQL Delete
The Delete statement is used to remove records from a table. Table Name ‘Users’ ...more »
SQL Delete
   
SQL Join
Tables in a database are often related to each other with keys. A primary key is a column which has a unique value for each record. It must be unique within the table. The purpose...more »
SQL Join
   
SQL Inner Join
SQL Inner Join keyword will return the records if there is at least one match in both tables. Table Name ‘Users’ ...more »
SQL Inner Join
   
SQL Left Join
SQL LEFT Join keyword will returns all records from the left table, even if there are no matches in the right table. Table Name ‘Users&rsqu...more »
SQL Left Join
   
SQL Right Join
SQL RIGHT Join keyword will returns all records from the right table, even if there are no matches in the left table. Table Name ‘Users&rsq...more »
SQL Right Join
   
SQL Full Join
The Full Join keyword will return records if there is a match in one of the tables. Table Name ‘Users’ ...more »
SQL Full Join
   
SQL Create Database
The CREATE DATABASE statement is used to create a new database. Syntax: CREATE DATABASE database_name ...more »
SQL Create Database
   
SQL Create Table
The CREATE TABLE statement is used to create a table in a database. Syntax: CREATE TABLE table_name (...more »
SQL Create Table
   
SQL Constraints
Constraints are specified when a table is created. They used to limit the type of data that can go into a table. Here are some constraints which are comm...more »
SQL Constraints
   
SQL Alter Table
The ALTER TABLE statement is used to add, delete, or modify columns in an existing table.  Syntax (To add a column in a table):...more »
SQL Alter Table
   
SQL Truncate Table
The Truncate Table statement is used to delete the data inside the table. It will delete all rows from the table. Syntax: ...more »
SQL Truncate Table
   
SQL Drop
SQL Drop Table The DROP TABLE statement is used to delete a table. Syntax: ...more »
SQL Drop
   
 
SQL Tutorial
 
  SQL Introduction
SQL Introduction
  SQL Select
SQL Select
  SQL Where Clause
SQL Where Clause
  SQL Distinct
SQL Distinct
  SQL AND Operator
SQL AND Operator
  SQL OR Operator
SQL OR Operator
  SQL Order By
SQL Order By
  SQL Insert
SQL Insert
  SQL Update
SQL Update
  SQL Delete
SQL Delete
  SQL Join
SQL Join
  SQL Inner Join
SQL Inner Join
  SQL Left Join
SQL Left Join
  SQL Right Join
SQL Right Join
  SQL Full Join
SQL Full Join
  SQL Create Database
SQL Create Database
  SQL Create Table
SQL Create Table
  SQL Constraints
SQL Constraints
  SQL Alter Table
SQL Alter Table
  SQL Truncate Table
SQL Truncate Table
  SQL Drop
SQL Drop
 
 
 
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