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philipxy

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Title Δ
Is there ALWAYS a "base table" in any database query? +0.09
What other ways are there to reduce data redundancy in relational d... 0.00
about query in domain relational calculus 0.00
Relational Algebra Stanford Lagunitas Online Course Quiz -1.61
What is the minimal proof that a database relation is not in BCNF? 0.00
Does single table inheritance results in denormalization 0.00
How do you deal with Recursive Relationships N:M, in Database Relat... 0.00
How to avoid writing lengthy where clauses in SQL when you join 2 t... +1.54
Relational Schema to ER Diagram /Cardinalities difference 0.00
MySQL left join: null elements be filtered by where +2.60
Understanding Self-Join Distinct Query -1.67
How Primary key can be only one in a table +0.58
How to express "no information" in relational algebra? 0.00
What is Android Room foreign key used for? 0.00
Can MySQL be convinced of functional dependency when HAVING COUNT(*... +0.36
Joining Multiple Tables in SQLite - Book Reader -0.52
Is this a BCNF violation? 0.00
ER diagram modeling of a auction transaction 0.00
How to subtract values form two columns in RelaX (online relational... 0.00
If there are any disadvantage by not to use primary table / key in... -0.08
Is possible in a single pass build a FULL JOIN for a in-memory stru... 0.00
Understanding natural join in Relational algebra 0.00
Why condition of union compatibility is not applicable to cartesian... 0.00
A primary key with more than 3 attributes 0.00
Functional dependency inferences with redundant relation +2.05
Why does this cascade of projection not change the projecton result? 0.00
What is the difference between theta join and inner join? 0.00
Why an 'ON' clause is required in a left outer join +0.08
Am I Properly Normalizing this Data -1.98
Is it Important to Understand Each Normal Form -0.88
Normal forms: 4 vs 5 +1.81
Sqlite left join composite keys 0.00
Do I need to handle nulls on LEFT JOINs? +1.06
SQL query to join these 3 tables to remove spurious rows - OWNER, T... +0.48
BCNF - Is it possible here? Name, Sport Centre, Sport +0.49
Relational Algebra rule for column transformation 0.00
Composite FK with nullable fields +2.11
Relational Algebra and Cardinality? 0.00
Simple relation decomposition example - insufficient information? 0.00
Reflexivity in functional dependencies -1.66
SQLzoo Music Tutorial item 4: left join or inner join? 0.00
Normalize a null value of table in database +1.96
Mysql cascade when updating/deleting null field 0.00
Exactly what is 2NF and 3NF? +1.39
What is ⟕ (left outer join) of 3 relations that have no shared attr... 0.00
Find the names of students who are not enrolled in any course - Stu... 0.00
Relational Algebra - Natural Join using Primary vs Foreign Key -0.02
Relational algebra expression 0.00
Is it possible to have more than one foreign key in a normalised da... +0.17
What is the equivalent, in Relational Algebra, of a SQL Table Relat... -0.51