Hello is product_id here : DELETE FROM products WHERE product_id=1

Question

Databases

𝘼𝙗𝙙𝙤 🧢

Hello is product_id here : DELETE FROM products WHERE product_id=1

should be defined as a PRIMARY KEY When creating the table in order for this query to be executed well ?

0

07.05.2022

6 ответов

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Edwing123

Edwing123
It's totally optional, primary keys are defined in...

All of this is optional, but the nice thing about it is: if you use these constraints, whenever you make a mistake (enter an article with an id value that already exists), the database server will throw an error

0

07.05.2022

Edwing123

Read about it on Google, you'll find a lot of information regarding DELETE FROM 😶

0

07.05.2022

Bread pup ▲⬤ ×▫︎

It should work fine without it being defined as primary key, although ids are usually defined as such

0

07.05.2022

𝘼𝙗𝙙𝙤 🧢 Автор вопроса

Edwing123
All of this is optional, but the nice thing about ...

thanks very much , thanks for all this clear explanation !!

0

07.05.2022

𝘼𝙗𝙙𝙤 🧢 Автор вопроса

Bread pup ▲⬤ ×▫︎
It should work fine without it being defined as pr...

alright thanks

0

07.05.2022

Edwing123 · Accepted Answer

Edwing123

It's totally optional, primary keys are defined in order to have one or more columns to uniquely identify a row in a table. CREATE TABLE article ( id PRIMARY KEY ); // <--- angry face? xD In the table article, the column id will uniquely identify an article entry (row). Behind the scenes, a primary key constrain will make the column(s) UNIQUE and NOT NULL

0

07.05.2022

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