Surrogate vs. natural/business keys [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
primary-key
Is there a REAL performance difference between INT and VARCHAR primary keys?
Is there a measurable performance difference between using INT vs. VARCHAR as a primary key in MySQL? I’d like to use VARCHAR as … Read more
Strings as Primary Keys in SQL Database [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the … Read more
Remove Primary Key in MySQL
I have the following table schema which maps user_customers to permissions on a live MySQL database: mysql> describe user_customer_permission; +——————+———+——+—–+———+—————-+ | Field | … Read more
How to properly create composite primary keys – MYSQL
Here is a gross oversimplification of an intense setup I am working with. table_1 and table_2 both have auto-increment surrogate primary keys as … Read more
ALTER TABLE to add a composite primary key
I have a table called provider. I have three columns called person, place, thing. There can be duplicate persons, duplicate places, and duplicate … Read more
Add primary key to existing table
I have an existing table called Persion. In this table I have 5 columns: persionId Pname PMid Pdescription Pamt When I created this … Read more
Django queries – id vs pk
When writing django queries one can use both id/pk as query parameters. Object.objects.get(id=1) Object.objects.get(pk=1) I know that pk stands for Primary Key and … Read more
How to add an auto-incrementing primary key to an existing table, in PostgreSQL?
I have a table with existing data. Is there a way to add a primary key without deleting and re-creating the table? 5 … Read more
Difference between Key, Primary Key, Unique Key and Index in MySQL
When should I use KEY, PRIMARY KEY, UNIQUE KEY and INDEX? 8 Answers 8