/*
Background : SQL2000 supports collation at different levels.
Collation can be based on the Windows Collation or SQL Collation.
Collation can be specified at the server, database & column level.
For more details, see the BOL topics on COLLATION. So this small
article should give a fairly detailed view of the various options
available & gotchas! COLLATION is very powerful but requires good
understanding to use them efficiently.
*/
-- To determine all the available collations use the system function
-- fn_helpcollations. The example below gets all the SQL Latin collations.
SELECT * FROM ::fn_helpcollations()
WHERE [name] LIKE 'SQL_Latin%';
/*
name description
------------------------------- ---------------------------------------------------------------
SQL_Latin1_General_CP437_BIN Latin1-General, binary sort for Unicode Data,
SQL Server Sort Order 30 on Code Page 437 for non-Unicode Data
SQL_Latin1_General_CP437_CI_AI Latin1-General, case-insensitive, accent-insensitive,
kanatype-insensitive, width-insensitive for Unicode Data,
SQL Server Sort Order 34 on Code Page 437 for non-Unicode Data
SQL_Latin1_General_CP437_CI_AS Latin1-General, case-insensitive, accent-sensitive,
kanatype-insensitive, width-insensitive for Unicode Data,
SQL Server Sort Order 32 on Code Page 437 for non-Unicode Data
SQL_Latin1_General_CP437_CS_AS Latin1-General, case-sensitive, accent-sensitive,
kanatype-insensitive, width-insensitive for Unicode Data,
SQL Server Sort Order 31 on Code Page 437 for non-Unicode Data
SQL_Latin1_General_CP850_BIN Latin1-General, binary sort for Unicode Data,
SQL Server Sort Order 40 on Code Page 850 for non-Unicode Data
SQL_Latin1_General_CP850_CI_AI Latin1-General, case-insensitive, accent-insensitive,
kanatype-insensitive, width-insensitive for Unicode Data,
SQL Server Sort Order 44 on Code Page 850 for non-Unicode Data
SQL_Latin1_General_CP850_CI_AS Latin1-General, case-insensitive, accent-sensitive,
kanatype-insensitive, width-insensitive for Unicode Data,
SQL Server Sort Order 42 on Code Page 850 for non-Unicode Data
*/
GO
-- To determine the server-wide collation established during SETUP do:
SELECT SERVERPROPERTY( 'Collation' ) AS Server_Default_Collation;
/*
Server_Default_Collation
------------------------------
SQL_Latin1_General_CP437_CI_AS
*/
GO
-- Now let's create a database with a different collation
-- than the server's i.e., the SQL Latin with binary sort order
CREATE DATABASE CollateTestDB COLLATE SQL_Latin1_General_CP850_BIN;
GO
USE CollateTestDB;
GO
-- To check the database collation do:
SELECT DATABASEPROPERTYEX( 'CollateTestDB' , 'Collation' ) AS Database_Default_Collation
/*
Database_Default_Collation
----------------------------
SQL_Latin1_General_CP850_BIN
*/
GO
-- Default table creation behavior
CREATE TABLE Tbl1 (
Col1 char( 10 ) NOT NULL ,
Col2 varchar( 10 ) NULL
);
INSERT INTO Tbl1 VALUES( 'a' , 'b' );
INSERT INTO Tbl1 VALUES( 'A' , 'B' );
GO
/* Column properties from "EXEC sp_help 'Tbl1';" output is shown below:
Column_name Type Length Collation
----------- ------- ------ ----------------------------
Col1 char 10 SQL_Latin1_General_CP850_BIN
Col2 varchar 10 SQL_Latin1_General_CP850_BIN
*/
GO
-- To verify binary sort order / collation
SELECT * FROM Tbl1 WHERE Col1 = 'a' And Col2 = 'b';
-- Expected output:
/*
Col1 Col2
---------- ----------
a b
*/
GO
-- To force a case-sensitive check
SELECT * FROM Tbl1
WHERE Col1 COLLATE SQL_Latin1_General_CP850_CI_AI = 'a' And
Col2 COLLATE SQL_Latin1_General_CP850_CI_AI = 'b';
-- Expected output:
/*
Col1 Col2
---------- ----------
a b
A B
*/
-- Create a table with columns having case-sensitive collation
CREATE TABLE Tbl2 (
Col1 char( 10 ) COLLATE SQL_Latin1_General_CP850_CS_AS NOT NULL ,
Col2 varchar( 10 ) COLLATE SQL_Latin1_General_CP850_CI_AI NULL
);
INSERT INTO Tbl2 VALUES( 'a' , 'b' );
INSERT INTO Tbl2 VALUES( 'A' , 'B' );
GO
/* Column properties from "EXEC sp_help 'Tbl2';" output is shown below:
Column_name Type Length Collation
----------- ------- ------ ----------------------------
Col1 char 10 SQL_Latin1_General_CP850_CS_AS
Col2 varchar 10 SQL_Latin1_General_CP850_CI_AI
*/
GO
-- Some sample SELECT statements:
SELECT * FROM Tbl2 WHERE Col1 = 'a';
/*
Col1 Col2
---------- ----------
a b
*/
SELECT * FROM Tbl2 WHERE Col2 = 'b';
/*
Col1 Col2
---------- ----------
a b
A B
*/
-- Now let's take this problem a step further & create a temporary table
-- using Tbl1 by performing a SELECT INTO. Notice that the columns are
-- created with the collation of the columns of Tbl1.
SELECT * INTO #Tbl1 FROM Tbl1;
EXEC( 'Use Tempdb EXEC sp_help ''#Tbl1''');
DROP TABLE #Tbl1;
/* Column properties from output is shown below:
Column_name Type Length Collation
----------- ------- ------ ----------------------------
Col1 char 10 SQL_Latin1_General_CP850_BIN
Col2 varchar 10 SQL_Latin1_General_CP850_BIN
*/
Go
-- Similarly , to create a table using SELECT INTO with a different
-- collation for the columns, do:
SELECT Col1 COLLATE SQL_Latin1_General_CP437_CI_AS AS Col1,
Col2 COLLATE SQL_Latin1_General_CP437_CI_AS AS Col2
INTO #Tbl1 FROM Tbl1;
EXEC( 'Use Tempdb EXEC sp_help ''#Tbl1''');
DROP TABLE #Tbl1;
/* Column properties from sp_help output is shown below:
Column_name Type Length Collation
----------- ------- ------ ----------------------------
Col1 char 10 SQL_Latin1_General_CP437_CI_AS
Col2 varchar 10 SQL_Latin1_General_CP437_CI_AS
*/
Go
-- Now do the same by creating a temporary table using CREATE TABLE statement.
-- The created table will use the default of tempdb & not the current user db.
CREATE TABLE #Tbl1 (
Col1 char( 10 ) NOT NULL ,
Col2 varchar( 10 ) NULL
);
EXEC( 'Use Tempdb EXEC sp_help ''#Tbl1''');
DROP TABLE #Tbl1;
/* Column properties from output is shown below:
Column_name Type Length Collation
----------- ------- ------ ----------------------------
Col1 char 10 SQL_Latin1_General_CP437_CI_AS
Col2 varchar 10 SQL_Latin1_General_CP437_CI_AS
*/
Go
/*
To force the creation of the temporary table with the current user database
collation default, use the DATABASE_DEFAULT clause with COLLATION like:
*/
CREATE TABLE #Tbl1 (
Col1 char( 10 ) COLLATE database_default NOT NULL ,
Col2 varchar( 10 ) COLLATE database_default NULL
);
EXEC( 'Use Tempdb EXEC sp_help ''#Tbl1''');
DROP TABLE #Tbl1;
/* Column properties from output is shown below:
Column_name Type Length Collation
----------- ------- ------ ----------------------------
Col1 char 10 SQL_Latin1_General_CP850_BIN
Col2 varchar 10 SQL_Latin1_General_CP850_BIN
*/
Go
-- Now we are all set, drop the test database
USE master;
DROP DATABASE CollateTestDB;
GO
This page was last updated on May 01, 2006 04:28 PM.