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philipxy

Rating
1512.61 (54,505th)

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11,699 (12,666th)

Page: 1 2 3 4 5 6 ... 17

Title	Δ
Is multiplication allowed in relational algebra?	+0.18
Why 1:M and not N:M (ER diagram)	-1.94
Does an empty SQL table have a superkey? Does every SQL table?	+2.53
What exactly does the three-schema architecture refer to?	0.00
What is the maximum number of tuples that can be returned by natura...	-0.00
How to avoid problems with composite entity keys and constraints (P...	0.00
Sort Table by id	+2.56
How to represent GROUP BY with HAVING COUNT(*)>1 in relational a...	0.00
SQL Enforcing a constraint that requires some logic	0.00
Creating a table that will give me a list of books with and without...	-0.16
Database Normalization Process to 3NF CustomerRental for CustNo, Pr...	0.00
Do I need a polymorphic association here or is my model not fleshed...	0.00
How do I achieve Second Normal Form for Student, Subject and Studen...	+0.51
What SQL query to access data from a table twice-removed, fully nor...	-0.48
Inner join an inner join with another inner join	-0.76
Selecting values from foreign tables	0.00
relationships between 3 entities in ER diagram--is a ternary enough...	+0.50
What is the difference between a relationship with total participat...	+0.51
Can a relation have Candidate Keys with different lengths?	+0.00
When should a social security number be used as a database primary...	+1.86
Can I use a counter in a database Many-to-Many field to reduce look...	0.00
Exam re normalizing Songs(singerID, singerName, songID, songName, s...	+0.47
how to create foreign reference key for composition primary key	+0.51
Why are Many-to-Many joins so resource-consuming and how to predict...	0.00
Create a belongs to many relationship with more than 2 models envol...	0.00
how to add a foreignkey to a composite primary key	-0.24
SQL Natural Join Dilemma re Order, Customer & Salesman tables	-0.48
How to convert an existing relational database to a key-value store?	-0.55
How to use left outer join in mysql to get my desirable results?	-0.01
How to establish a many to one relationship between 2 tables for a...	-0.46
Strange duplicate behavior from GROUP_CONCAT of two LEFT JOINs of G...	0.00
Logic/reasoning confusion in UGC book re network/relational logical...	0.00
How does update join on work in sql	0.00
Confusion re PK (primary key) and CK (candidate key) for FDs (funct...	0.00
Why does FULL JOIN order make a difference in these queries?	-1.49
A confusion about 2nd normal form for relation (R,N,S,C,X,P)	0.00
Cross Table Dependency/Constraint in SQL Database	+0.51
Is delete allowed to modify its parameter?	-0.56
SQL Query optimization - distributive law of natural join and diffe...	0.00
Is it a bad idea to have a composite primary key that contains a fo...	-0.82
Transform between relational database and graph-based database	0.00
Converting an ER diagram into relational scheme	0.00
List every match with the goals scored by each team as shown. This...	0.00
Partial dependency	0.00
Unsafe tuple calculus expressions	0.00
MySQL LEFT JOIN with SUM before a date and SUM before and at that d...	0.00
Lossy decompositions	0.00
Foreign key constrains in mysql when trying to add foreign key rela...	-0.47
Only one key from composite primary key as foreign key	+2.53
How can I design these tables to prevent corrupted data where one t...	-0.47