primary-key Archives

I have the following table schema which maps user_customers to permissions on a live MySQL database: mysql> describe user_customer_permission; +------------------+---------+------+-----+---------+----------------+ | Field | ...

May 29, 2022
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MySQL, Programming

IT Nursery

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 ...

May 28, 2022
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MySQL, Programming

IT Nursery

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 ...

May 28, 2022
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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 ...

May 24, 2022
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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 ...

May 22, 2022
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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 ...

May 22, 2022
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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

May 19, 2022
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