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Which of the following is NOT a rule for tables in a relational database? a . Table names must be unique. b . No duplicate

Which of the following is NOT a rule for tables in a relational database?

.

Table names must be unique.

.

No duplicate columns in a table

.

No duplicate rows in a table

.

Every table must have a primaty key.

.

None of the above

(

all are rules

)

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