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What is the purpose of using COLLATE in a query?
COLLATE can also be used with the column name and input character string. A common use of the query level collation (collate SQL) is to compare case-sensitive strings. For example, imagine two tables with similar collation and compare their columns using join or subquery.
How do you use COLLATE?
You can specify collations for each character string column using the COLLATE clause of the CREATE TABLE or ALTER TABLE statement. You can also specify a collation when you create a table using SQL Server Management Studio. If you do not specify a collation, the column is assigned the default collation of the database.
How does COLLATE work SQL?
Collation is a set of rules that tell database engine how to compare and sort the character data in SQL Server. Collation can be set at different levels in SQL Server….Collation setting can be specified on the below character column types:
- varchar.
- nvarchar.
- char.
- nchar.
- text.
- ntext.
How do you query collation?
To view a collation setting for a column in Object Explorer Expand Databases, expand the database and then expand Tables. Expand the table that contains the column and then expand Columns. Right-click the column and select Properties. If the collation property is empty, the column is not a character data type.
What does collate Database_default mean?
MSDN states COLLATE DATABASE_DEFAULT clause casts the collation of an expression, column definition, or database definition to inherit the collation of the “current database”. To complement MSDN, the “current database” is the context of the database where the query is executed.
What is Latin1_General_CI_AS?
The Latin1_General_CI_AS collation is a Windows collation and the rules around sorting unicode and non-unicode data are the same. A Windows collation as per this example can still use an index if comparing unicode and non-unicode data albeit with a slight performance hit.
When to use collation at the query level?
Collation at the query level (collate SQL) will allow overriding the database or column-level collation when running a query. SQL Server supports multiple collations but cannot properly deal with collation mismatches. If a user tries to compare fields with different collations, SQL Server will return an error with collation names as shown below:
How to use the collate command in SQL Server?
Overview of the Collate SQL command 1 SQL Server level. Collation setting at SQL Server level can be specified while installing SQL Server. 2 Database level. 3 Column level. 4 Examples. 5 Joining the two columns of a different collation. 6 Tempdb collation. 7 Conclusion.
When to use collation casting in SQL Server?
SQL Server doesn’t support automatic collation casting when executing a query with a comparison of two columns with different collations. As mentioned above, collation is consistent with parent levels. In these situations with various UNICODE characters, COLLATE casting should be utilized.
What does the prefix collation in SQL mean?
The collation of the SQL Server is set to SQL_Latin1_General_CP1_CI_AS. Break down of the collation setting is as below: SQL – All SQL Server collations will have the prefix SQL Latin1_General – represents the sort rule, CI means case insensitive and AS means accent sensitive