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La clé primaire de la table T(A, B, C, D) dont le contenu est indiqué ci-dessou...
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La clé primaire de la table T(A, B, C, D) dont le contenu est indiqué ci-dessous, peut-être :
A
|
B
|
C
|
D
|
a1
|
b1
|
c1
|
d1
|
a3
|
b2
|
c1
|
d2
|
a2
|
b1
|
c2
|
d3
|
a2
|
b2
|
c2
|
d4
|
a3
|
b2
|
c3
|
NULL
|
0%
0%
0%
100%