sql - what does EXEC master.. Do? -

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i have seen like:

exec master.dbo.xp_cmdshell

what master refer to?

update
, why followed 2 points: 

 master..

generally use master.dbo. correct, why people write master..?

master 1 of default sql server system databases. can tell because posted:

exec master.dbo.xp_cmdshell

...uses 3 name notation. "master" in database position, "dbo" schema, , "xp_cmdshell" function/stored procedure in case. use notation referring tables , views, in different contexts.

this:

exec master..xp_cmdshell

...just omits schema, isn't idea if there more 1 schema being used in database.


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