Resolving Collation Conflicts in SQL Server: SQL_Latin1_General_CP1_CI_AS vs. Latin1_General_CI_AS
Автор: Quick FAQ
Загружено: 2025-08-05
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Resolving Collation Conflicts in SQL Server: SQL_Latin1_General_CP1_CI_AS vs. Latin1_General_CI_AS
A collation conflict between `SQL_Latin1_General_CP1_CI_AS` and `Latin1_General_CI_AS` arises because they are fundamentally different collation types, despite similar naming. `SQL_Latin1_General_CP1_CI_AS` is an older SQL Collation, primarily for backward compatibility, which has distinct sorting rules for non-Unicode (varchar) and Unicode (nvarchar) data. In contrast, `Latin1_General_CI_AS` is a more modern Windows Collation that provides consistent sorting rules across both data types and is generally preferred. To resolve this conflict in a query, you must explicitly force a common collation using the `COLLATE` clause in your `JOIN` or `WHERE` condition, for example: `WHERE table1.columnA = table2.columnB COLLATE Latin1_General_CI_AS`. A more permanent fix involves altering one of the table columns with `ALTER TABLE ... ALTER COLUMN ... COLLATE ...` to match the other, thereby standardizing the collation and preventing future conflicts for all queries involving those columns.
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