normal form (NF)
- 1NF
- requiring existence of "the key"
- 2NF
- requiring the non-key attributes be dependent on "the whole key"
- 3NF
- requiring the non-key attributes be dependent on "nothing but the key"
header | tag | body |
---|---|---|
hello | some | hello world... |
... | ... | ... |
... | ... | ... |
whole key = {header, tag}