I have this query
select * from archivo1 a
inner join padron.dbo.padron_ruc_bdu b
on a.num_doc = substring (b.ruc,3,8) collate modern_spanish_ci_as
where substring(b.ruc,1,2)<>'20'

i do not understand the use of  collate modern_spanish_ci_as
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It makes SQL Server do the comparison based on the specific collation.
You need to use collate x if the db collation is different from the sql server default collation and you are using functions.

See these references for collation
collate make the query case sensitive and retrieve only one record from the query
Adding COLLATE modern_spanish_ci_as makes the search case sensitive.

Default Collation of the SQL Server installation SQL_Latin1_General_CP1_CI_AS is not case sensitive.
Hi abaraj,

FYI If you look closely, _ci_as means case-insensitive, ascent sensitive..... so I don't know what you're on

Try this

select case when 'a' = 'A' COLLATE modern_spanish_ci_as then 1 else 0 end

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Hi cyberkiwi,
Thanks for your input
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Microsoft SQL Server 2008

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