When we run:
ALTER DATABASE abc COLLATE Latin1_General_CP1_CI_AS ; GO
Msg 448, Level 16, State 3, Line 1
Invalid collation 'Latin1_General_CP1_CI_AS'.
How can we add the
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There never has been a "Latin1_General_CP1_CI_AS": it is "Latin1_General_CI_AS" or "Latin1_General_100_CI_AS"
You may be confusing it with "SQL_Latin1_General_CP1_CI_AS" which is legacy, basically.
Saying that, the collation offered at setup varies based on your regional settings. See SQL Server 2005 collation issue during installation for more (I've no idea why US English locale offers a "legacy" SQL collation)
SELECT * FROM ::fn_helpcollations() FH WHERE name LIKE '%Latin%_CI_AS'
The collation is not missing it is invalid. Try