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Composite Primary Key on mysql workbench
Should I use the datetime or timestamp data type in MySQL?Setting up foreign keys in phpMyAdmin?Sqlite primary key on multiple columnsHow to find all tables that have foreign keys that reference particular table.column and have values for those foreign keys?Multiple-column foreign key in MySQL?How can I define a composite primary key in SQL?Mysql error 1452 - Cannot add or update a child row: a foreign key constraint failsALTER TABLE to add a composite primary keyMySQL error code: 1175 during UPDATE in MySQL Workbenchcomposite foreign key not working
I am generating composite primary key on cart table product_Id and User_Id. Those are primary keys on the product table and user table accordingly.
So
- Do I need to do a reference to these primary keys (foreign keys so the only existing ids are the one existing in both tables)?
- Can I leave it as two primary keys ?
- How do I add them in MySqlWorkbench?
mysql mysql-workbench composite-primary-key
edited 12 hours ago
inetphantom
1,28011943
asked 14 hours ago
FerFer
41
add a comment |
I am generating composite primary key on cart table product_Id and User_Id. Those are primary keys on the product table and user table accordingly.
So
- Do I need to do a reference to these primary keys (foreign keys so the only existing ids are the one existing in both tables)?
- Can I leave it as two primary keys ?
- How do I add them in MySqlWorkbench?
mysql mysql-workbench composite-primary-key
edited 12 hours ago
inetphantom
1,28011943
asked 14 hours ago
FerFer
41
add a comment |
I am generating composite primary key on cart table product_Id and User_Id. Those are primary keys on the product table and user table accordingly.
So
- Do I need to do a reference to these primary keys (foreign keys so the only existing ids are the one existing in both tables)?
- Can I leave it as two primary keys ?
- How do I add them in MySqlWorkbench?
mysql mysql-workbench composite-primary-key
edited 12 hours ago
inetphantom
1,28011943
asked 14 hours ago
FerFer
41
I am generating composite primary key on cart table product_Id and User_Id. Those are primary keys on the product table and user table accordingly.
So
- Do I need to do a reference to these primary keys (foreign keys so the only existing ids are the one existing in both tables)?
- Can I leave it as two primary keys ?
- How do I add them in MySqlWorkbench?
mysql mysql-workbench composite-primary-key
mysql mysql-workbench composite-primary-key
edited 12 hours ago
inetphantom
1,28011943
asked 14 hours ago
FerFer
41
edited 12 hours ago
inetphantom
1,28011943
asked 14 hours ago
FerFer
41
edited 12 hours ago
inetphantom
1,28011943
edited 12 hours ago
inetphantom
1,28011943
edited 12 hours ago
inetphantom
1,28011943
1,28011943
asked 14 hours ago
FerFer
41
asked 14 hours ago
FerFer
41
asked 14 hours ago
FerFer
41
41
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
From what I've tried in the past, the best thing to do is to make product_id and user_id as foreign keys and reference them to their respective primary keys in tables product and user.
This way you can be sure that the data is not being filled wrong.
answered 14 hours ago
AbdoAbdo
637
add a comment |
It depends on what you want to achieve with your database.
Most probably you want to add them as foreign keys to your n to n table. Easiest thing is to open the workbench in the modeling view and define a n to n relation between product and user.
This will make sure that you have data integrity on your tables.
You might want to have only one connection per user - product pair. You can achieve this by either creating a unique index no those two or making them primary key for that new table. I personally would not go for a composed key as your model might change and you then are way more flexible.
answered 13 hours ago
inetphantominetphantom
1,28011943
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
From what I've tried in the past, the best thing to do is to make product_id and user_id as foreign keys and reference them to their respective primary keys in tables product and user.
This way you can be sure that the data is not being filled wrong.
answered 14 hours ago
AbdoAbdo
637
add a comment |
From what I've tried in the past, the best thing to do is to make product_id and user_id as foreign keys and reference them to their respective primary keys in tables product and user.
This way you can be sure that the data is not being filled wrong.
answered 14 hours ago
AbdoAbdo
637
add a comment |
From what I've tried in the past, the best thing to do is to make product_id and user_id as foreign keys and reference them to their respective primary keys in tables product and user.
This way you can be sure that the data is not being filled wrong.
answered 14 hours ago
AbdoAbdo
637
From what I've tried in the past, the best thing to do is to make product_id and user_id as foreign keys and reference them to their respective primary keys in tables product and user.
This way you can be sure that the data is not being filled wrong.
answered 14 hours ago
AbdoAbdo
637
answered 14 hours ago
AbdoAbdo
637
answered 14 hours ago
AbdoAbdo
637
answered 14 hours ago
AbdoAbdo
637
637
add a comment |
add a comment |
It depends on what you want to achieve with your database.
Most probably you want to add them as foreign keys to your n to n table. Easiest thing is to open the workbench in the modeling view and define a n to n relation between product and user.
This will make sure that you have data integrity on your tables.
You might want to have only one connection per user - product pair. You can achieve this by either creating a unique index no those two or making them primary key for that new table. I personally would not go for a composed key as your model might change and you then are way more flexible.
answered 13 hours ago
inetphantominetphantom
1,28011943
add a comment |
It depends on what you want to achieve with your database.
Most probably you want to add them as foreign keys to your n to n table. Easiest thing is to open the workbench in the modeling view and define a n to n relation between product and user.
This will make sure that you have data integrity on your tables.
You might want to have only one connection per user - product pair. You can achieve this by either creating a unique index no those two or making them primary key for that new table. I personally would not go for a composed key as your model might change and you then are way more flexible.
answered 13 hours ago
inetphantominetphantom
1,28011943
add a comment |
It depends on what you want to achieve with your database.
Most probably you want to add them as foreign keys to your n to n table. Easiest thing is to open the workbench in the modeling view and define a n to n relation between product and user.
This will make sure that you have data integrity on your tables.
You might want to have only one connection per user - product pair. You can achieve this by either creating a unique index no those two or making them primary key for that new table. I personally would not go for a composed key as your model might change and you then are way more flexible.
answered 13 hours ago
inetphantominetphantom
1,28011943
It depends on what you want to achieve with your database.
Most probably you want to add them as foreign keys to your n to n table. Easiest thing is to open the workbench in the modeling view and define a n to n relation between product and user.
This will make sure that you have data integrity on your tables.
You might want to have only one connection per user - product pair. You can achieve this by either creating a unique index no those two or making them primary key for that new table. I personally would not go for a composed key as your model might change and you then are way more flexible.
answered 13 hours ago
inetphantominetphantom
1,28011943
answered 13 hours ago
inetphantominetphantom
1,28011943
answered 13 hours ago
inetphantominetphantom
1,28011943
answered 13 hours ago
inetphantominetphantom
1,28011943
1,28011943
add a comment |
add a comment |
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