6,412 reputation
1821
bio website mooseware.ca
location Mississauga, Canada
age 52
visits member for 2 years, 11 months
seen 19 hours ago

I'm a professional software developer with more than twenty years of experience across many industries and the entire systems development lifecycle. I'm the principal consultant at Mooseware Limited.

@joelabrown

google

facebook

linkedin


Mar
26
comment Problem with reaching second normal form in a database
@ypercube is right. Take repeating groups out to get to 1NF. You can't be 2NF if you aren't 1NF yet, regardless of the definition/test for 2NF.
Mar
25
revised Attempting to identify transitive dependency
Added analysis of dependencies
Mar
25
revised Attempting to identify transitive dependency
Added analysis of dependencies
Mar
24
comment Attempting to identify transitive dependency
Product code is a foreign key to the PRODUCT table in your invoice detail. In the product table, product code is the determinant, in the invoice item table, it is just a dependent attribute.
Mar
24
answered Attempting to identify transitive dependency
Mar
5
answered Database Design
Feb
27
answered What is the difference between logical schema and physical schema?
Feb
24
awarded  Custodian
Feb
24
reviewed Approve suggested edit on Getting the exact edited data from a column in SQL Server
Feb
20
answered Database throughful design vs Quick and dirty design comparison
Feb
8
answered Why does data get corrupted in “large” text files - Reasons to use database
Feb
7
answered Recipe Health risk Database ERD structure
Jan
30
comment Table design for departments with duplicate department numbers
@jeff - The issue is about normalization based on functional dependencies. For a logical model you probably would have separate director and VP tables. That doesn't mean your physical model needs them. It may be, based on what you say about employee-department mapping that the PK of department is a composite of dept_id and manager_id. That would also work and it might solve your problem of how to join employee in. I assume your employee table has a manager_id and a dept_id so that would solve your problem.
Jan
30
answered Table design for departments with duplicate department numbers
Jan
26
comment What's a good way to model user authorization to hierarchical data?
@a_horse_with_no_name - True enough, although I think there is room for discussion about how easily anything can be done with CTEs and there's nothing difficult about maintaining nested sets. I think adjacency list vs. visitation number is really more a matter of personal preference. I expect one could argue endlessly about their relative merits, which they surely have, but in the end it will come down to one's particular situation or priorities.
Jan
25
answered Db Design of a Room Booking System
Jan
20
comment Normal form for a relation where the number of tuples having the same value in a column is the same for all the possible values in that column
Normal forms are about how columns in a table relate to each other (and to columns in other tables). Normal forms don't address how rows relate to each other.
Jan
13
comment Best way to handle column that doesn't conform to one particular type
@lee - There are lots of good books - too many to be on topic for StackExchange. Try Googling around for technical books that include the word "Cookbook" in the title. That's a good indication that it's a collection of patterns/applications/best practices.
Jan
13
answered Best way to handle column that doesn't conform to one particular type
Jan
10
comment Store last elements in a dedicated table
Having less data doesn't necessarily mean it will be significantly faster. You have to think about all of the extra reading and writing that your idea would involve. A properly indexed read is extremely fast, even in huge tables. It is a mistake to assume poor performance without actually testing it out.