Understand Unicode and code pages in SQL Server collations -

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Why all SQL Server 2008 R2 collations are linked to a code page are all collocations unicode?

When a database is used by multiple languages ​​using different code pages, then how to choose a match?

Thank you.

CRAC vs NCHH (i.e. non-Unicode versus Unicode) defines character storage encoding. Collations define ... collation (ie order order and comparison rule). They are different concepts, though they are often confused.

Illusion arises from the fact that the client tools use coding of non-Unicode data to select the sign code page. See . This means that clients like ADO.Net SqlClient can be retrieved from the single-byte CHAR data server multi-byte string net object The columns used in the metadata will be coated and therefore the client will know how to interpret single-byte data according to the specific code page.

For the Unicode (NCHAR) column, the client does not need to interpret it according to the code page, the data is already multi-byte and the customer is using it UCS-2 encoding (SQL Server) The actual taste of the Unicode done).

While not confusing what exactly is the relation: comparison rules for the characters. As described in:

An English speaker expects the character string 'Chiapas' to come before 'Colima' in ascending order. However, in Mexico, a Spanish speaker can expect words beginning with 'f' at the end of the list of words starting with 'C'. Coalition organizes these sorting sorting and comparison rules. Under the Latino_1 normal matching order, the ASC will align the 'Chiapas' before the 'Coelima' section, whereas the traditional association colonization will align the 'Chiapas' after 'Coelima'.

This sorting rule applies any data type (CRAR non-Unicode or NCHR Unicode).

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