Replacing cursors using joins in sql server - Part 64

In Part 63, we have discussed about cursors. 

Update tblProductSales
set UnitPrice = 
Case 
When Name = 'Product - 55' Then 155
When Name = 'Product - 65' Then 165
When Name like 'Product - 100%' Then 10001
End
from tblProductSales
join tblProducts
on tblProducts.Id = tblProductSales.ProductId
Where Name = 'Product - 55' or Name = 'Product - 65' or 
Name like 'Product - 100%'

When I executed this query, on my machine it took less than a second. Where as the same thing using a cursor took 45 seconds. Just imagine the amount of impact cursors have on performance. Cursors should be used as your last option. Most of the time cursors can be very easily replaced using joins.

To check the result of the UPDATE statement, use the following query.
Select  Name, UnitPrice from 
tblProducts join
tblProductSales on tblProducts.Id = tblProductSales.ProductId
where (Name='Product - 55' or Name='Product - 65' or 
Name like 'Product - 100%')