محمدی، رئیس سازمان سنجش:
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create view V(A, B, C)
as select A, B, sum (D) from R Group By A, B
Anonymous Quiz
15%
1) از این دید میتوان عملیات ذخیرهسازی انجام داد.
41%
2) از این دید نمیتوان عملیات ذخیرهسازی انجام داد.
26%
3) از این دید میتوان عملیات ذخیرهسازی انجام داد ولی عوارض نامطلوب دارد.
18%
4) از این دید میتوان عملیات ذخیرهسازی انجام داد ولی استقلال دادهای حذف میشود.
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create view V(A, B, C)
as select A, B, sum (D) from R Group By A, B
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