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SQL - SELECT

In this article of SQL  we will learn about Selection so Let's start.

 

 

If we want to retrieve all database record then we use :

Select * from table_name.

 

If we want to retrieve particular record then:

Select * from table_name where Customerid = 1


 

The following SQL statement selects only "Employee Id" and "Name" columns from the "Employee" table:

 Select  EmployeeId and Name from Employee.


SELECT - DISTINCT

It is use to return distinct(different) values

 

The following SQL statement selects only the DISTINCT values from the "EmployeeName" column in the "Employee" table:

 Select distinct EmployeeName from Employee;

 

Let's say we want to count distinct Employee Name then:

Select Count(Distinct EmployeeName) from Employee;




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