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單項(xiàng)選擇題

john has created a database library, librarians are responsible for adding new information to the db library. which one of the following minimum level of access he can grant the librarians of the db library?（）

A. reader
B. author
C. manager
D. designer

單項(xiàng)選擇題

lisa is writing a formula to determine the number of elements in a list. she wants to ensure that a value is returned, even if the value her function is evaluating turns out to be a null string . which one of the following can she so to accomplish this ?（）

A.use a defaule formula of 1
B.use @elements and add 1 to the total
C.use the @count function instead of @elements
D.use @texttotime to ensure that all strings arte converted to date-time values

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