When was SQL Server installed
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SELECT @@SERVERNAME AS [Server Name],
createdate AS [SQL Server Install Date]
FROM sys.syslogins
WHERE [sid] = 0x010100000000000512000000;
output
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How to Check Errorlog based on specific time
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xp_readerrorlog 0,1,N'',N'',N'5/14/2014 7:22:18 AM',N'5/14/2014 7:22:19 AM'
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How To Find Out Who Installed SQL Server:-
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