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Compound Key

RecipeID

IngrOrd

IngrID

IngrAmt

MixB4Cook

Rest

IngrTime

102345

01

22

2

Y

N

1

102345

02

12

3

Y

Y

1

102345

03

16

2

Y

N

1

This concept is not specifically related to 1NF but it is needed to cover some of the examples. In this table I need both RecipieID AND IngrOrd to make the Unique Key field. This is a practice that is used in Database Design