MySQL SELECT条件CONCAT

Question

I have a database which basically holds addresses

The table (tblAddress) looks like this...

housename    | housenumber | address1    | address2        | address3 | town      | postcode
Banana House |          29 | Acacia Road | Yellow Skin Way |          | Nuttytown | W1 1MP

When I search the database based on a postcode I want to be able to return and result like this...

Banana House,29 Acacia Road,Yellow Skin Way,Nuttytown,W1 1MP

So I need the housenumber concatenated with address1 IF address1 is populated. If not then concat with address2 or address3. Then the rest of the address to follow as per the example.

I tried using IF and CASE statements but can't seem to get anywhere near the output I'm after.

Hope that makes sense.

Answer 1

You can do it by adding few concat operations.

Check below code it should work.

SELECT CONCAT(housename, CONCAT(" ",CONCAT(housenumber, CONCAT(" ",CONCAT_WS(' ,', 
                  NULLIF(address1, ''), 
                  NULLIF(address2, ''), 
                  NULLIF(address3, ''),
                  NULLIF(town, ''),
                  NULLIF(postcode, '')))))) AS concatedAddress FROM tblAddress;

Answer 2

Use concat_ws() (concatenation with separator) along with nullif()

SELECT CONCAT_WS(',', NULLIF(housename, ''), 
                      NULLIF(housenumber, ''),  
                      NULLIF(address1, ''), 
                      NULLIF(address2, ''), 
                      NULLIF(address3, ''),
                      NULLIF(town, ''),
                      NULLIF(postcode, '')
       ) AS address FROM tblAddress

Answer 3

Try like below,

 SELECT CONCAT_WS ( ", ",
    housename,
    CONCAT(housenumber, CONCAT_WS (", ", NULLIF(address1, ''), NULLIF(address2, ''), NULLIF(address3, ''))),
    town,
    postcode) AS address
FROM tblAddress

Answer 4

How about this:

SELECT 
       housename
      ,CONCAT( housenumber, CONCAT(' ', COALESCE(address1, '')), CONCAT(' ', COALESCE(address2, '')), CONCAT(' ', COALESCE(address3, '')) ) AS address
      ,town
      ,postcode 
FROM tblAddress;