Have multiple foreign keys or one
I have 3 table:
brand: brand_id(pk), name
product: product_id(pk), name
brand_product: brand_product_id(pk), brand_id, product_id
And I have a report table, at the moment it looks like this:
product_report: product_report_id(pk), quantity, brand_id, product_id
My question is, what are the pros and cons of having the brand_product_id column instead of brand_id, product_id.
postgresql postgresql-9.3
asked Oct 14 '14 at 8:58
RockNinjaRockNinja
3053920
bumped to the homepage by Community♦ 30 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
I have 3 table:
brand: brand_id(pk), name
product: product_id(pk), name
brand_product: brand_product_id(pk), brand_id, product_id
And I have a report table, at the moment it looks like this:
product_report: product_report_id(pk), quantity, brand_id, product_id
My question is, what are the pros and cons of having the brand_product_id column instead of brand_id, product_id.
postgresql postgresql-9.3
asked Oct 14 '14 at 8:58
RockNinjaRockNinja
3053920
bumped to the homepage by Community♦ 30 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
I have 3 table:
brand: brand_id(pk), name
product: product_id(pk), name
brand_product: brand_product_id(pk), brand_id, product_id
And I have a report table, at the moment it looks like this:
product_report: product_report_id(pk), quantity, brand_id, product_id
My question is, what are the pros and cons of having the brand_product_id column instead of brand_id, product_id.
postgresql postgresql-9.3
asked Oct 14 '14 at 8:58
RockNinjaRockNinja
3053920
I have 3 table:
brand: brand_id(pk), name
product: product_id(pk), name
brand_product: brand_product_id(pk), brand_id, product_id
And I have a report table, at the moment it looks like this:
product_report: product_report_id(pk), quantity, brand_id, product_id
My question is, what are the pros and cons of having the brand_product_id column instead of brand_id, product_id.
postgresql postgresql-9.3
postgresql postgresql-9.3
asked Oct 14 '14 at 8:58
RockNinjaRockNinja
3053920
asked Oct 14 '14 at 8:58
RockNinjaRockNinja
3053920
asked Oct 14 '14 at 8:58
RockNinjaRockNinja
3053920
asked Oct 14 '14 at 8:58
RockNinjaRockNinja
3053920
asked Oct 14 '14 at 8:58
RockNinjaRockNinja
3053920
3053920
bumped to the homepage by Community♦ 30 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
bumped to the homepage by Community♦ 30 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
add a comment |
1 Answer
1
active
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votes
In my opinion the pros are:
- when using queries, you can select a specific row inside brand_product, by only using brand_product_id.
- if you want another table, connected to the brand_product table, you can specify the rows by just using the brand_product_id rather than the combination of brand_id and product_id (though, it's rare to connect a third table to a junction table like brand_product, but not impossible. I did it in my previous project)
cons:
- you can have a row with the same brand_id and product_id combination multiple times (but you can solve this by creating a unique index on the product_id and brand_id columns).
So it's not a bad idea to have a brand_product_id.
answered Oct 14 '14 at 9:43
Erik van de VenErik van de Ven
386316
add a comment |
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1 Answer
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1 Answer
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active
oldest
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oldest
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In my opinion the pros are:
- when using queries, you can select a specific row inside brand_product, by only using brand_product_id.
- if you want another table, connected to the brand_product table, you can specify the rows by just using the brand_product_id rather than the combination of brand_id and product_id (though, it's rare to connect a third table to a junction table like brand_product, but not impossible. I did it in my previous project)
cons:
- you can have a row with the same brand_id and product_id combination multiple times (but you can solve this by creating a unique index on the product_id and brand_id columns).
So it's not a bad idea to have a brand_product_id.
answered Oct 14 '14 at 9:43
Erik van de VenErik van de Ven
386316
add a comment |
In my opinion the pros are:
- when using queries, you can select a specific row inside brand_product, by only using brand_product_id.
- if you want another table, connected to the brand_product table, you can specify the rows by just using the brand_product_id rather than the combination of brand_id and product_id (though, it's rare to connect a third table to a junction table like brand_product, but not impossible. I did it in my previous project)
cons:
- you can have a row with the same brand_id and product_id combination multiple times (but you can solve this by creating a unique index on the product_id and brand_id columns).
So it's not a bad idea to have a brand_product_id.
answered Oct 14 '14 at 9:43
Erik van de VenErik van de Ven
386316
add a comment |
In my opinion the pros are:
- when using queries, you can select a specific row inside brand_product, by only using brand_product_id.
- if you want another table, connected to the brand_product table, you can specify the rows by just using the brand_product_id rather than the combination of brand_id and product_id (though, it's rare to connect a third table to a junction table like brand_product, but not impossible. I did it in my previous project)
cons:
- you can have a row with the same brand_id and product_id combination multiple times (but you can solve this by creating a unique index on the product_id and brand_id columns).
So it's not a bad idea to have a brand_product_id.
answered Oct 14 '14 at 9:43
Erik van de VenErik van de Ven
386316
In my opinion the pros are:
- when using queries, you can select a specific row inside brand_product, by only using brand_product_id.
- if you want another table, connected to the brand_product table, you can specify the rows by just using the brand_product_id rather than the combination of brand_id and product_id (though, it's rare to connect a third table to a junction table like brand_product, but not impossible. I did it in my previous project)
cons:
- you can have a row with the same brand_id and product_id combination multiple times (but you can solve this by creating a unique index on the product_id and brand_id columns).
So it's not a bad idea to have a brand_product_id.
answered Oct 14 '14 at 9:43
Erik van de VenErik van de Ven
386316
answered Oct 14 '14 at 9:43
Erik van de VenErik van de Ven
386316
answered Oct 14 '14 at 9:43
Erik van de VenErik van de Ven
386316
answered Oct 14 '14 at 9:43
Erik van de VenErik van de Ven
386316
386316
add a comment |
add a comment |
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