Question

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Database query to search using address

I am developing a search functionality to search for dealers by their address (i.e by postcode(zip) or by name or by city) for my project. User will be provided with only one html input field to enter the search term (users can enter only one search term at a time i.e either zip code or name or city (combinations are not allowed)).

The conditions to develop a query are as below

• when user search by zip code, matched results should be displayed in descending order
• when user search by name matched results should be display alphabetically same as city name

Some times there is a possibility that name can also contains zip code in that case results should be shorted by zip code.

I tried like this

select city, postcode, name 
from dealers 
where name ='xyz' 
 OR postcode ='xyz' 
 OR city='XYZ' 
ORDER BY postcode desc

But Ii want ORDER BY for every condition. for example ‘xyz’ matches to the firstname I want to sort the result in ascending order.

How can i do that? Any suggestions will be greatly appriciated

Answer 1

Try this:

SELECT 
  city, postcode, name 
FROM 
  dealers
WHERE 
...
ORDER BY
  CASE WHEN @postcodeParam IS NOT NULL THEN postcode END DESC,
  CASE WHEN @nameParam     IS NOT NULL THEN name     END, 
  CASE WHEN @citynameParam IS NOT NULL THEN cityname END