What is Hash and Range Primary Key?
I am not able to understand what Range / primary key is here in the docs on Working with Tables and Data in … Read more
primary-key
difference between primary key and unique key
I’m using mysql database. I have a confusion between primary key and unique key. Please help me where should I create primary and … Read more
SQL Server add auto increment primary key to existing table
As the title, I have an existing table which is already populated with 150000 records. I have added an Id column (which is … Read more
What are the best practices for using a GUID as a primary key, specifically regarding performance? [closed]
Closed. This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be … Read more
Can I have multiple primary keys in a single table?
Can I have multiple primary keys in a single table? 12 Answers 12
What’s the Hi/Lo algorithm?
What’s the Hi/Lo algorithm? I’ve found this in the NHibernate documentation (it’s one method to generate unique keys, section 5.1.4.2), but I haven’t … Read more
Unable to update the EntitySet – because it has a DefiningQuery and no element exist
I am using Entity Framework 1 with .net 3.5. I am doing something simple like this: var roomDetails = context.Rooms.ToList(); foreach (var room … Read more
How to reset postgres’ primary key sequence when it falls out of sync?
I ran into the problem that my primary key sequence is not in sync with my table rows. That is, when I insert … Read more
Sqlite primary key on multiple columns
What is the syntax for specifying a primary key on more than 1 column in SQLITE ? 9 s 9 According to the … Read more
How can I do ‘insert if not exists’ in MySQL?
I started by googling and found the article How to write INSERT if NOT EXISTS queries in standard SQL which talks about mutex … Read more