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TERTIARY_WEIGHTS (Transact-SQL)

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

Topic link icon Transact-SQL Syntax Conventions

TERTIARY_WEIGHTS( non_Unicode_character_string_expression )
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.

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).

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.

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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