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simple question: ON PRIMARY?

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simple question: ON PRIMARY? MS SQL Development forum discussing administration, MS SQL queries, and other MS SQL-related topics. SQL Server is Microsoft's enterprise database engine.

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Old July 23rd, 2004, 03:25 AM
rishijd rishijd is offline
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simple question: ON PRIMARY?
Hi,

Im really new to MS SQL - actually I just have a schema that I need to convert to Postgresql format. The MS SQL database already exists - I need to use a Postgresql web database to hold part of the master database's information.

So, I've converted most of the "CREATE TABLE" schema, but right at the end it says:

Code:
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO


I have NO idea what the ON [PRIMARY] TEXTIMAGE_ON [PRIMARY] bit means. Can someone please explain to me? And what part this would play in my Postgresql conversion?

Ive been reading up a lot and find that the ON [PRIMARY] bit is pretty much standard with all tables, and TEXTIMAGE_ON [PRIMARY] is used a lot as well. But I'd just like to find out the meaning.

So far I'm presuming I'd just have to delete that line since it doesn't apply to Postgresql. Am I right?

Also, there was no primary key in the schema.. how does MS SQL identify the primary key for a table? I thought that every table needs at least one primary key ?

Thanks a lot in advance!
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Old July 23rd, 2004, 08:57 AM
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You should Google a bit ... see http://doc.ddart.net/mssql/sql2000/...reate2_8g9x.htm as an example.
Quote:
ON {filegroup | DEFAULT}

Specifies the filegroup on which the table is stored. If filegroup is specified, the table is stored in the named filegroup. The filegroup must exist within the database. If DEFAULT is specified, or if ON is not specified at all, the table is stored on the default filegroup.

ON {filegroup | DEFAULT} can also be specified in a PRIMARY KEY or UNIQUE constraint. These constraints create indexes. If filegroup is specified, the index is stored in the named filegroup. If DEFAULT is specified, the index is stored in the default filegroup. If no filegroup is specified in a constraint, the index is stored on the same filegroup as the table. If the PRIMARY KEY or UNIQUE constraint creates a clustered index, the data pages for the table are stored in the same filegroup as the index.



Note DEFAULT, in the context of ON {filegroup | DEFAULT} and TEXTIMAGE_ON {filegroup | DEFAULT}, is not a keyword. DEFAULT is an identifier for the default filegroup and must be delimited, as in ON "DEFAULT" or ON [DEFAULT] and TEXTIMAGE_ON "DEFAULT" or TEXTIMAGE_ON [DEFAULT].


TEXTIMAGE_ON

Are keywords indicating that the text, ntext, and image columns are stored on the specified filegroup. TEXTIMAGE ON is not allowed if there are no text, ntext, or image columns in the table. If TEXTIMAGE_ON is not specified, the text, ntext, and image columns are stored in the same filegroup as the table.


Those are storage options, because you can store table data, indexes and blob content on different filegroups (and disks) to speed things up.
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