Adding & updating multiple tables in a dataset

I want to have a dataset consisting of 3 tables. I originally did it with a single SELECT statement:

Code:

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myDataAdapter = New SQLDataAdapter("SELECT * FROM Table1; SELECT * FROM Table2; SELECT * FROM Table3", myConnection)

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But found (from experience and other sites) that the update command won't work for tables added like this. Instead, I needed to change my code to:

Code:

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myDataAdapter1 = New SqlDataAdapter("SELECT * FROM Table1", myCon)
myDataAdapter2 = New SqlDataAdapter("SELECT * FROM Table2", myCon)
myDataAdapter3 = New SqlDataAdapter("SELECT * FROM Table3", myCon)

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and issue 3 separate FILL statements to properly fill the dataset with the 3 tables.

I also found that I need to use the command builder:

Code:

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myCommandBuilder = New SqlCommandBuilder(myDataAdapter1)
myCommandBuilder = New SqlCommandBuilder(myDataAdapter2)
myCommandBuilder = New SqlCommandBuilder(myDataAdapter3)

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to get the update to work properly.

I use the following code, for example, to update Table 3:

Code:

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myDataAdapter3.Update(myDS, "Table3")

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So my question is, if I have to deal with 3 separate data adapters, why not just create 3 separate tables? What's the benefit of having all 3 tables in a single dataset of the separate adapters need to be used anyway?

Greg