如何将此选择查询转换为关系代数:
SELECT Student.Name, Result.Mark
FROM Student, Results
WHERE Student.ID = Results.ID AND Results.Code = 'G51DBS'
这是我所拥有的,但我不确定:
[σ{Student.Name}(Student)]∪[Π{Result.Makr}σ{Student.ID = Results.ID ∧ results.code = g51dbs}(Results)]
最佳答案
关于mysql - 将 SQL 代码转换为关系代数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/23673362/