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To limit the number of rows use the WHERE clause.
The WHERE clause filters for rows that meet certain criteria.
WHERE is followed by a condition that returns either true or false.
WHERE is used with SELECT, UPDATE, and DELETE.

The SQL WHERE syntax

A WHERE clause with a SELECT statement:
SELECT column-names
  FROM table-name
 WHERE condition

A WHERE clause with an UPDATE statement:
UPDATE table-name
   SET column-name = value
 WHERE condition

A WHERE clause with a DELETE statement:
DELETE table-name
 WHERE condition

SQL WHERE Clause Examples

Problem: List the customers in Sweden
SELECT Id, FirstName, LastName, City, Country, Phone
  FROM Customer
 WHERE Country = 'Sweden'

Problem: Update the city to Sydney for supplier Pavlova, Ltd.
UPDATE Supplier
   SET City = 'Sydney'
 WHERE Name = 'Pavlova, Ltd.'

Problem: Delete all products with unit price higher than 50.
 WHERE UnitPrice > 50

Note: Referential integrity may prevent this deletion.
A better approach may be to discontinue the product, that is, set IsDiscontinued to true.

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Atul kumar shukla

I'm Atul Kumar Shukla, working as a web developer.
Welcome to my Blog. This is my personal blog where i post my own questions and answers , articles about ASP.Net., SQL Server, HTML, CSS, Jquery and many more..

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