If theĭatabase collation is changed, then the existing columns will retain the original collation but new columns will be The default collation for SQL Server user-defined column is inherited from the database configured collation. The existing column index will be dropped and re-created automatically. This activity will place a lock on the tables because the column will be altered with the new collation. To apply new collation to existing tables of a database, the user can set new collation on TEXT columns of tables. If tables with various collations exist in the database, there can be errors while creating a join between them. However, new tables will be characterized by the changed database collation. If the default collation of a database is changed by a user, then the collation of existing, user-defined To find the SQL Server instance level collation use, the T-SQL shown below: If one of the user databases is restored with other than tempdb’s collation and the temp table is used in any T-SQL statement or procedure inside a user database that compares text-based columns using WHERE clause or JOIN conditions, the query will return an error because both of the tables do not have the same collation. Tempdb will always be configured with the instance level default collation. If a user’s database collation is configured differently than one of the SQL Server instance collation, then a comparison between tables in that database and in tempdb, when it comes to textual data comparison, will return an error. In descending order, these are:Ī SQL Server instance collation is the default collation for the system databases.
SQL Server allows collations to be configured at different levels of the database engine, but, by default, every level will inherit the collation settings from the parent level. This is not recommended since it can influence existing query execution and query result sets.Ī list of collations supported by the installed version of SQL Server can be generated using sys.fn_helpcollations() With the assistance of the SQL Server Installation setup, collation can be changed, however, the effect of that on the current database and its tables can be unpredictable. Users can change the collation settings at the database level but not at the SQL Server level. New databases will be configured with the default collation of the SQL Server. SQL Server installation configuration sets the default collation for the created instance (Latin1_General_CI_AI). This distinction is important for data sorting in the query result set. For example, information in the column can be case sensitive, and lowercase letters will not be treated the same as uppercase letters. It matters which collation is associated with a column when ordering clause is applied to that column. When retrieving data using a T-SQL query, collation plays a fundamental role in the execution. Data always follows collation constraint rules, which are configured when creating an object.
#COLLATE DEFINITION PRINTING UPDATE#
Collate SQL follows rules applied on a table when Select, Insert, Update orĭelete operations are performed against contained data. SQL Server collation refers to a set of character and character encoding rules, and influences how information is stored according to the order in the data page, how data is matched by comparing two columns, and how information is arranged in the T-SQL query statement.
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