You can execute the system function fn_helpcollations to retrieve a list of all the valid collation names for Windows collations and SQL Server collations: SELECT name, description In Setup, you instead specify the root collation designator (the collation locale) for Windows collations, and then specify sort options that are sensitive or insensitive to case or accents. collation_name cannot be represented by a variable or expression.Ĭollations are generally identified by a collation name, except in Setup. collation_name can be only a specified Windows_collation_name or a SQL_collation_name and the parameter must contain a literal value.
The COLLATE clause can be applied only for the char, varchar, text, nchar, nvarchar, and ntext data types.ĬOLLATE uses collate_name to refer to the name of either the SQL Server collation or the Windows collation to be applied to the expression, column definition, or database definition. The identifiers for variables, GOTO labels, temporary stored procedures, and temporary tables are in the default collation of the server instance. Variables, GOTO labels, temporary stored procedures, and temporary tables can be created when the connection context is associated with one database, and then referenced when the context has been switched to another database. For more information, see Database Identifiers. For example, two tables with names different only in case may be created in a database with case-sensitive collation, but may not be created in a database with case-insensitive collation.
Identifiers of objects within a database, such as tables, views, and column names, are assigned the default collation of the database. Identifiers of instance-level objects, such as logins and database names, are assigned the default collation of the instance. The collation of an identifier depends on the level at which it is defined. Column references are assigned the definition collation of the column. Character literals and variables are assigned the default collation of the current database. You can use the COLLATE clause to apply a character expression to a certain collation. You can also use the database_default option in the COLLATE clause to specify that a column in a temporary table use the collation default of the current user database for the connection instead of tempdb. If you do not specify a collation, the column is assigned the default collation of the database. You can also specify a collation when you create a table using SQL Server Management Studio. You can specify collations for each character string column using the COLLATE clause of the CREATE TABLE or ALTER TABLE statement. Windows Unicode-only collations can only be used with the COLLATE clause to apply collations to the nchar, nvarchar, and ntext data types on column-level and expression-level data these cannot be used with the COLLATE clause to define or change the collation of a database or server instance. If you do not specify a collation, the database is assigned the default collation of the instance of SQL Server.
You can also specify a collation when you create a database using SQL Server Management Studio. You can use the COLLATE clause of the CREATE DATABASE or ALTER DATABASE statement to specify the default collation of the database. The COLLATE clause can be specified at several levels. SQL_collation_name is the collation name for a SQL Server Collation Name.Ĭauses the COLLATE clause to inherit the collation of the current database. Windows_collation_name is the collation name for a Windows Collation Name. collation_name cannot be represented by a variable or expression. collation_name can be only a specified Windows_collation_name or a SQL_collation_name. Is the name of the collation to be applied to the expression, column definition, or database definition. On a.key COLLATE DATABASE_DEFAULT = b.To view Transact-SQL syntax for SQL Server 2014 and earlier, see Previous versions documentation. This SQL statement will solve the collation issue: select a.fieldA, b.fieldB You should add COLLATE DATABASE_DEFAULT to the “on” statement. If this SQL statement fails: select a.fieldA, b.fieldB The collation is used by the database to apply the correct sorting and comparison of fields, which is why a comparison of 2 fields with different collations cannot be executed. This can happen when the 2 databases is created with different collations (language settings). When joining 2 tables from different databases, the following error might occur:Ĭannot resolve the collation conflict between “SQL_Latin1_General_CP1_CI_AS” and “Danish_Norwegian_CI_AS” in the equal to operation.
0 kommentar(er)
