If you do this query in SQL Server it will give you 15 different columns- one for each postcode.
SELECT
'CB89RX', 'CB259BL', 'CB19BF', 'CB245HS', 'CB30AP', 'CB12LJ',
'CB21RB', 'CB28PX', 'CB28PE', 'CB250HX', 'CB231HN', 'CB58TD',
'CB246AY', 'CB42QT', 'CB249JA' AS A
What I want is 1 column that contains all 15 values. How can I do this?