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What is the difference between a Graph Database and a Network Database?

nvogel answers

Identifying one-to-many relationship
Should I make a foreign key that can be null or make a new table?
When can an SQL result contain duplicates?
Union All With if/else T-SQL
How to choose my primary key?
Which SQL Server field type is best for storing price values?
Sql Design Question
Why is it necessary to indicate identifying or non-identifying relationships in an ERD?
database design for dictionary application
SQL to find the first occurrence of sets of data in a table