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primary-key

Surrogate vs. natural/business keys [closed]

by IT Nursery

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

Tags database, database-design, key, primary-key

Is there a REAL performance difference between INT and VARCHAR primary keys?

by IT Nursery

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

Tags innodb, myisam, MySQL, performance, primary-key

Strings as Primary Keys in SQL Database [closed]

by IT Nursery

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

Tags database, database-design, primary-key, sql, string

Remove Primary Key in MySQL

by IT Nursery

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

Tags database-design, MySQL, mysql-error-1075, primary-key, sql

How to properly create composite primary keys – MYSQL

by IT Nursery

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

Tags composite-key, composite-primary-key, myisam, MySQL, primary-key

ALTER TABLE to add a composite primary key

by IT Nursery

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

Tags alter-table, composite-primary-key, MySQL, primary-key, sql

Add primary key to existing table

by IT Nursery

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

Tags constraints, primary-key, sql, sql-server, sql-server-2008

Django queries – id vs pk

by IT Nursery

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

Tags django, orm, primary-key

How to add an auto-incrementing primary key to an existing table, in PostgreSQL?

by IT Nursery

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

Tags auto-increment, postgresql, primary-key

Difference between Key, Primary Key, Unique Key and Index in MySQL

by IT Nursery

When should I use KEY, PRIMARY KEY, UNIQUE KEY and INDEX? 8 Answers 8

Tags indexing, MySQL, primary-key, sqlperformance, unique-key
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