如何使用arel / relational algebra和has_many获取不同的值:through - 当我试图显示一个人所在的所有电影,并且他们在电影中有超过1个角色(导演,作家,演员)时,我会为该电影获得多行。如果我添加.select('DISTINCT id')或电影。*来尝试消除重复,我会收到以下错误
The null value is a special symbol with some unknown properties, while disjunctive information represents disjunctive facts of the form: "P is the case, or Q is, or …, but I do not know which." In this paper, we investigate the problem of disjunctive information in relational databases. ...
(Kojima and Shane Gu, 2022,Liu et al., 2023), we opted to employ a combination of well-established, high-performing prompts and our original proposals. In the following list, we outline the specific prompt used for each dataset. Prompts marked with a†symbol represent those that we have...
In some recent research, I was building an automated algebra tool to find axioms for some algebraic structure, based on an interpretation. This involved generating all pairs of syntax treestandt'of terms over the algebraic structure, up to a particular depth, and evaluating whethert = t'. I ...
hat zwei Vorteile: Zum einen kann damit auf die Disjunktion zwischen den Alien-Relationen verzichtet werden, und zum anderen wird die Mächtigkeit des Al-lenschen Formalismus dahingehend eingeschränkt, dass die Konsistenzberech-1 Im Folgenden werde ich die abkürzenden Symbole <, > und ...
Testemale, Generalizing Database Relational Algebra for the Treatment of Incomplete or Uncertain Information and Vague Queries, Information Sciences Vol. 34, 1984, pp. 115-143.H. Prade and C. Testemale. Generalizing database relational algebra for the treatment of incom- plete/uncertain information...