We give a language-independent characterization of the expressive power of the relational algebra on finite sets of source-target relation instance pairs. The associated decision problem is shown to ...

Relational Algebras We start by describing the classical (or non-categorical) view of relational theories because it should look more familiar to most people. The classical story starts with universal ...

So I am trying to write an update statement that uses two factors to determine the new value of the field, one of the factors is an aggregate function (COUNT). I get the error: An aggregate may ...

Technical documentation for Microsoft SQL Server, tools such as SQL Server Management Studio (SSMS) , SQL Server Data Tools (SSDT) etc. - MicrosoftDocs/sql-docs ...

description: SQL Server CLR integration allows you to create custom aggregate functions in managed code, which perform a calculation on a set of values and return a value.

J. Duffy and C. Papageorgiou, “A Cross-Country Empirical Investigation of the Aggregate Production Function Specification,” Journal of Economic Growth, Vol. 5, No ...

A data aggregation and dilution scheme is introduced for the wireless sensor network, which can be perceived as a distributed relational database. A new algorithm that can run on tiny sensor nodes to ...