Virtuality, the quality of having the attributes of something without sharing its (real or imagined) physical form
The SID - Account ID Virtual Table[MSDN] is virtual, it has no physical representation (or, in this case no corresponding table object in SQL). It does not even appear to NAV as a regular table. In fact, it probably shares more properties with a function than with a table.
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Van Vugt's dynamiXs
Dutch Dynamics Community
is there anybody know how to map Navision SID to get User name in SQL script?
Furthermore you can investigate the following tables where NAVdb is your Dynamics NAV database:
NAVdb.dbo.[Windows Login]
NAVdb.dbo.User
master.dbo.sysprocesses
master.dbo.sysdatabases
NAVdb.sys.database_principals
master.sys.syslogins
NAVdb.sys.sysusers
...