I tried to upgrade AX 2012 R3 Retail channel database from CU9 to CU11 for client.
after generated new CreateDatabase.dll with upgraded Retail SDK, ran the Channel Configuration Utility, but got error.
So I tried the sql queries from CreateDatabase project's DatabaseScript.txt in SSMS.
store database's sql engine is sql server 2008, which does not support sql function 'CONCAT'. (It's supported from SQL 2012)
So I changed the DatabaseScript.txt, re-genreated a CreateDatabse.dll.
Then successfully upgraded the store database.