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TERTIARY_WEIGHTS

SQL Server 2005

Returns a binary string of weights for each character in a non-Unicode string expression defined with an SQL tertiary collation.

Syntax


TERTIARY_WEIGHTS( non_Unicode_character_string_expression )

Arguments

non_Unicode_character_string_expression: Is a string expression of type char, varchar, or varchar(max) defined on a tertiary SQL collation. For a list of these collations, see Remarks.

Return Types

TERTIARY_WEIGHTS returns varbinary when non_Unicode_character_string_expression is char or varchar, and returns varbinary(max) when non_Unicode_character_string_expression is varchar(max).

Remarks

TERTIARY_WEIGHTS returns NULL when non_Unicode_character_string_expression is not defined with an SQL tertiary collation. The following table shows the SQL tertiary collations.

Sort order ID	SQL collation
33	SQL_Latin1_General_Pref_CP437_CI_AS
34	SQL_Latin1_General_CP437_CI_AI
43	SQL_Latin1_General_Pref_CP850_CI_AS
44	SQL_Latin1_General_CP850_CI_AI
49	SQL_1xCompat_CP850_CI_AS
53	SQL_Latin1_General_Pref_CP1_CI_AS
54	SQL_Latin1_General_CP1_CI_AI
56	SQL_AltDiction_Pref_CP850_CI_AS
57	SQL_AltDiction_CP850_CI_AI
58	SQL_Scandinavian_Pref_CP850_CI_AS
82	SQL_Latin1_General_CP1250_CI_AS
84	SQL_Czech_CP1250_CI_AS
86	SQL_Hungarian_CP1250_CI_AS
88	SQL_Polish_CP1250_CI_AS
90	SQL_Romanian_CP1250_CI_AS
92	SQL_Croatian_CP1250_CI_AS
94	SQL_Slovak_CP1250_CI_AS
96	SQL_Slovenian_CP1250_CI_AS
106	SQL_Latin1_General_CP1251_CI_AS
108	SQL_Ukrainian_CP1251_CI_AS
113	SQL_Latin1_General_CP1253_CS_AS
114	SQL_Latin1_General_CP1253_CI_AS
130	SQL_Latin1_General_CP1254_CI_AS
146	SQL_Latin1_General_CP1256_CI_AS
154	SQL_Latin1_General_CP1257_CI_AS
156	SQL_Estonian_CP1257_CI_AS
158	SQL_Latvian_CP1257_CI_AS
160	SQL_Lithuanian_CP1257_CI_AS
183	SQL_Danish_Pref_CP1_CI_AS
184	SQL_SwedishPhone_Pref_CP1_CI_AS
185	SQL_SwedishStd_Pref_CP1_CI_AS
186	SQL_Icelandic_Pref_CP1_CI_AS

TERTIARY_WEIGHTS is intended for use in the definition of a computed column that is defined on the values of a char, varchar, or varchar(max) column. Defining an index on both the computed column and the char, varchar, or varchar(max) column can improve performance when the char, varchar, or varchar(max) column is specified in the ORDER BY clause of a query.

Examples

The following example creates a computed column in a table that applies the TERTIARY_WEIGHTS function to the values of a char column.

CREATE TABLE TertColTable
(Col1 char(15) COLLATE SQL_Latin1_General_Pref_CP437_CI_AS,
Col2 AS TERTIARY_WEIGHTS(Col1));
GO

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