How to Identify SQL Service Pack Version

You can identify the current service pack of an SQL install by viewing the corresponding registry key.

SQL 2005

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL.1\(Instance Name)\CurrentVersion

CurrentVersion value =
Gold:9.00.1399.*
SP1:9.00.2047.*
SP2:9.00.3042.*
SP3:9.00.4032.*
SP4:9.00.5000.*

SQL 2008

32-Bit: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL10.(Instance Name)\MSSQLServer\CurrentVersion
64-Bit: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Microsoft SQL Server\MSSQL10.(Instance Name)\MSSQLServer\CurrentVersion

CurrentVersion value =
Gold:10.0.1600.*
SP1: 10.0.2531.*
SP2:10.0.4000.*
SP3:10.0.5500.*

SQL 2008 R2

32-Bit: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL10_50.(Instance Name)\MSSQLServer\CurrentVersion
64-Bit: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Microsoft SQL Server\MSSQL10_50.(Instance Name)\MSSQLServer\CurrentVersion

CurrentVersion value =
Gold:10.50.1600.*

SP1: 10.50.2500.*

SP2:10.50.4000.*

SQL 2012

32-Bit: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\(Instance Name)\MSSQLServer\CurrentVersion
64-Bit: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Microsoft SQL Server\(Instance Name)\MSSQLServer\CurrentVersion

CurrentVersion value =
Gold:11.0.2100.*
SP1:11.0.3000.*