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Is there a measurable performance difference between using INT vs. VARCHAR as a primary key in MySQL? I’d like to use VARCHAR as the primary key for reference lists...
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I have the following table schema which maps user_customers to permissions on a live MySQL database: mysql> describe user_customer_permission; +------------------+---------+------+-----+---------+----------------+ | Field | Type | Null | Key |...
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 the ID. info is a table...
I have a table called provider. I have three columns called person, place, thing. There can be duplicate persons, duplicate places, and duplicate things, but there can never be...
I have an existing table called Persion. In this table I have 5 columns: persionId Pname PMid Pdescription Pamt When I created this table, I set PersionId and Pname...
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 is just a shortcut, according to...
I have a table with existing data. Is there a way to add a primary key without deleting and re-creating the table? 5 Answers 5
When should I use KEY, PRIMARY KEY, UNIQUE KEY and INDEX? 8 Answers 8