Bazy_dannykh_Uchebnoe_posobie
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16.
A * B (A TIMES B) :
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69 |
A[X,Y,Z].
19:
, 
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18.
.
1
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A [
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. 
:
-
(
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.
A 
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(A TIMES B) WHERE c
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A 
B 
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