what is .. in sql

Hello Experts,

What is ".." in SQL?

Thanks,
Wayne
thewayne73Asked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
you refer to 4-part-notation

see some variations on how to specify the table you want to query, specifying the table owner, database, linked server name, all optional.

SELECT * FROM table
SELECT * FROM table_owner.table
SELECT * FROM database.table_owner.table
SELECT * FROM database..table
SELECT * FROM linked_server.database.table_owner.table
SELECT * FROM linked_server.database..table
SELECT * FROM linked_server...table

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chapmandewCommented:
it is use to omit the schema name of an object...so, this:

select * from databasename.schemaname.tablename

can be written (if the schemaname is dbo) as

select * from databasename..tablename

you're just leaving out the schema name
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brad2575Commented:
you need to be more specific.

Where at are you referring to this?  In a query?  In a table name path definition?

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chapmandewCommented:
angelIII, can you do this? (ive never tried it, but it doesn't make sense that you can)

SELECT * FROM linked_server...table
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thewayne73Author Commented:
Perfect explaination.  Thanks.
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
>angelIII, can you do this? (ive never tried it, but it doesn't make sense that you can)
>SELECT * FROM linked_server...table

yes. the default database of the login used will be "used" implicitly
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
also, some "linked server" (like oracle) do not have the "concept" of "instance/database", but just database, so that part of "database" must be left empty.
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Microsoft SQL Server 2005

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