SQLを使い始めたとき、 多くのプログラマが例外なく難儀するのが、 SQLで制御構造をうまく書けないことです。ここで言う制御構造とは、 平たく言えば条件分岐とループです。といっても別に、 SQLに制御構造を書くための機能が備わっていないとか、 貧弱 ...

SubQuery allows teams across multiple blockchain architectures to process and query their data. The project is inspired by the growth of data protocols serving the application layer and its aim is to ...

Abstract: In this paper, we present a translator from a relevant subset of SQL into relational algebra. The translation is syntax-directed, with translation rules associated with grammar productions; ...

Note: This example uses a Version 6 view descriptor with the Pass-Through Facility to access DBMS data. Beginning in Version 7, you can associate a libref directly with your DBMS data and use the ...