About SQL Server Compatibility Levels

Each SQL Server version has a specific native compatibility level, as a way to distinguish it from other SQL Server versions. The compatibility level is used internally in SQL Server for many operations.

For example, if you try to restore a database backup taken on SQL Server 2017 with native compatibility level 140, to an older SQL Server instance, for example SQL Server 2014 with native compatibility level 120 you will get an error since you cannot do that.

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Backup and Restore with Different SQL Server Compatibility Levels

However, if you backup a database on a SQL Server instance (i.e. instance A) and restore it on a newer one (i.e. instance B), given the fact that the instance B is backwards compatible with instance A, you can restore the database on the new instance and either maintain its compatibility level, or upgrade it (via database options) to the native compatibility level of the new SQL Server instance.

 

Table with SQL Server Compatibility Levels

In the below table, you can find the currently available SQL Server versions, along with their compatibility level and backwards compatibility:

SQL Server Version	Compatibility Level	Backward Compatibility
2005	90	90, 80
2008	100	100, 90, 80
2008 R2	100	100, 90, 80
2012	110	120, 110, 100
2014	120	120, 110, 100
2016	130	130, 120, 110, 100
2017	140	140, 130, 120, 110, 100
2019	150	150, 140, 130, 120, 110, 100
2022	160	160, 140, 130, 120, 110, 100

 

A Free Online Service – SQL Server Backward Compatibility Check

Moreover, there is a free online service I have created, which you can find here, at SQLNetHub, which given a SQL Server version, it returns backwards compatibility info.

Also, you can learn more about SQL Server, by enrolling to my course “SQL Server Fundamentals – SQL Database for Beginners“.

Last, you can learn more about SQL Server compatibility levels and the ALTER DATABASE T-SQL statement on this MS-Docs article.

 

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Reference: SQLNetHub.com (https://www.sqlnethub.com)

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