I've asked the same question on stackoverlow, but got no answer, so that's why I'm asking it here (I've read that simple sql questions should be asked at SO, but I have no choice). Suppose I have 3 ...
(Edit: since reposted to dba.stackexchange.com and answered there). Suppose I have 3 models: Post, PostCategory and Category. I'm implementing some kind of page with filters where I can filter posts ...
I understand that the Cartesian product(X) operation on two databases does not need to be UNION compatible.So,if there is a same attribute called name in the two relations R and S where name in R is ...
I guess this is an easy and stupid question. Consider this MySQL purchase table (where p_id is autoincremented): +---------+-------------+---------------+---------+ | p_id | item_id | user_id ...
Suppose I have structure like this: Recipes Table: RecipeID Name Description RecipeIngredients Table: RecipeID IngredientID Quantity UOM What are some good ways for ...
I want to implement class either-or table inheritance (Account, CatAccountDetails, DogAccountDetails) in SQL Server. I found a recommendation for MySQL here (How do I map an IS-A relationship into a ...
I have two tables with a foreign key from T1->T2, in a one-to-many relationship. That is, 1 tuple in table T1 is associated with 0..N tuples in T2. To create a simple example, lets say T1 is Cars, ...
I have a table of Listings that has a many to many relationship with a Taxons table. The table structure looks like this: listings ---------------- id (int) name (varchar) listings_taxons ...