单选题What is necessary for your query on an existing view to execute successfully?（）A The underlying tables must have data.B You need SELECT privileges on the view.C The underlying tables must be in the same schema.D You need SELECT privileges only on the u

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单选题

What is necessary for your query on an existing view to execute successfully?（）

The underlying tables must have data.

You need SELECT privileges on the view.

The underlying tables must be in the same schema.

You need SELECT privileges only on the underlying tables.

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单选题What is necessary for your query on an existing view to execute successfully?（）A The underlying tables must have data.B You need SELECT privileges on the view.C The underlying tables must be in the same schema.D You need SELECT privileges only on the u

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