On Fri, 11 Dec 2009, Florian Schricker wrote:

> Schema of DB (simplified):
> - Oper (string)
> - Product (string)
> - Category (string)
> - Name (string)
> - CreateTS (Timestamp)
> - Value (Double)

Florian,

   The schema refers to the set of tables, and the attributes within each
table. Is the above one table or a set of tables.

> Primary keys are Oper, Product, Category, Name and CreateTS

   There is only one primary key per table.

> Can I do that in SQL in one query?

   I urge you to learn about database design and SQL. You can find a lot of
information on the Web and there are many good books on each topic. Only one
of the above attributes is specified as 'Double', yet you write about
dumping data as doubles into each one. Step back and do some learning before
you dig a big hole and fall into it.

Rich
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