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One could either do a unique constraint on those foreign keys or a composite primary key on those columns. For elegance, canonicity, a primary key is necessary. You would initially have a primary...
Answer
#3: Post edited
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2020-08-24T19:14:41Z (about 4 years ago)
clarifies
- > One could either do a unique constraint on those foreign keys or a composite primary key on those columns.
- For elegance, canonicity, a primary key is necessary. You would initially have a primary key on those columns.
However, for sortability reasons, you would eventually use just a primary key on a single column, so no, in the end you don't have a primary key on those columns, but a unique constraint.
- > One could either do a unique constraint on those foreign keys or a composite primary key on those columns.
- For elegance, canonicity, a primary key is necessary. You would initially have a primary key on those columns.
- However, for sortability reasons, you would eventually use just a primary key on a single column ad-hoc created to be the id/key, so no, in the end you don't have a primary key on those columns, but a unique constraint.
#2: Post edited
by
. .
·
2020-08-24T00:50:28Z (about 4 years ago)
- > One could either do a unique constraint on those foreign keys or a composite primary key on those columns.
- For elegance, canonicity, a primary key is necessary. You would initially have a primary key on those columns.
However, for sortability reasons, you would eventually use just a primary key on a single column, so no, you don't have a primary key on those columns, but a unique constraint.
- > One could either do a unique constraint on those foreign keys or a composite primary key on those columns.
- For elegance, canonicity, a primary key is necessary. You would initially have a primary key on those columns.
- However, for sortability reasons, you would eventually use just a primary key on a single column, so no, in the end you don't have a primary key on those columns, but a unique constraint.
#1: Initial revision
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2020-08-24T00:49:43Z (about 4 years ago)
> One could either do a unique constraint on those foreign keys or a composite primary key on those columns. For elegance, canonicity, a primary key is necessary. You would initially have a primary key on those columns. However, for sortability reasons, you would eventually use just a primary key on a single column, so no, you don't have a primary key on those columns, but a unique constraint.