relational-algebra
Aggregate Relational Algebra (Maximum)
I am currently working on a homework assignment that requires a selection to occur that pulls out an element containing a specific attribute of maximum value compared to all other records. I\'ve read[详细]
2023-02-09 09:13 分类：问答Selecting DISTINCT rows in relational algebra
There is a DISTINCT operator in SQL. However, I have an assignment in which I need to get some disti开发者_运维知识库nct values from a table, and I can only use relational algebra. Is there a way?Rela[详细]
2023-02-06 01:56 分类：问答Different way of writing intersection in relational algebra
U开发者_StackOverflow社区sing basic operators, derive the additional operator intersection. R ∩ S = ?[详细]
2023-02-05 04:11 分类：问答Relational algebra help
I\'m new to relational algebra and finding it difficult. I\'ve answered a few questions; however, they where relatively simple. Could do with help开发者_Go百科 with these though.[详细]
2023-02-04 03:11 分类：问答Relational algebra syntax
First time i encounter a relational algebra for databases question today, and i can\'t seem to find the answer.[详细]
2023-01-30 16:24 分类：问答Parser to parse Relational Algebras to T-Sql Codes and vice-versa
I now think about write a parser to parse Logical Expressions Relational Algebra to T-Sql Codes and vice-versa! Whether there is an parser to 开发者_开发问答do this? Otherwise how can i do this? What[详细]
2023-01-23 23:18 分类：问答Challenge!! Example of a valid 4th normal form relation that can perform 5th normal form decomposition
According to my professor in Intro. to Database Theory, th开发者_运维问答ere are NO examples in existence to show when this occasion would arise which seems a little bizarre considering its a specific[详细]
2023-01-23 22:35 分类：问答Represent a subquery in relational algebra
How do I represent a subquery in relation algebra? Do I 开发者_如何学运维put the new select under the previous select condition?[详细]
2023-01-18 18:50 分类：问答How to represent "not exists" in relational algebra?
How do I rep开发者_Go百科resent the SQL \"not exists\" clause in relational algebra?The SQL NOT EXISTS construct can be represented in relational algebra by the antijoin ▹.[详细]
2023-01-16 09:59 分类：问答How to fetch distinct values with arel/relational algebra
I\'m doing开发者_运维问答 my best to bend my brain around arel and the relational algebra behind it, but how to represent a SELECT DISTINCT is consistently eluding my comprehension. Can anyone explain[详细]
2023-01-05 04:55 分类：问答
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