Question

i am new in sql and i want that , i have a table Customer
in which i added a new field Region now i want to do some
alteration in SQL . I want to get all records Customerand check on each

 // This check will perfome for every customer let suppose we have our first customer
if currentcustomer.Country = 'US' 
 {
  UPDATE currentcustomer SET currentcustomer.Region=currentcustomer.id
 }
 else
 {
    UPDATE  currentcustomer SET currentcustomer.Region=currentcustomer.ZIP
  }

this is what i want to do but i dont know that how to do this over all customers and how to do this in sql . Please Help me Thanks!!!

Answer 1

UPDATE Customer SET Region='AA'
WHERE Country = 'US'

UPDATE Customer SET Region='ZZ'
WHERE Country <> 'US'

Avoid looping within SQL – it is not designed for looping.

Try to formulate your requirements in set based terminology (I need to update all customers who’s country is US to have region AA and all others to region ZZ).

Update:

Seeing your edit, and assuming it is sensible (compatible data types and meaningful data):

UPDATE Customer SET Region= id
WHERE Country = 'US'

UPDATE Customer SET Region= Zip
WHERE Country <> 'US'