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The relevant thing for exists is the set of the rows returned by the select being non/empty. The value in the columns is irrelevant. Using * creates an incorrec
by mjan22640 3y ago
The relevant thing for exists is the set of the rows returned by the select being non/empty.
The value in the columns is irrelevant. Using * creates an incorrect impression that the value is relevant and the relevance tied to the data.