题目
题目
单项选择题

Question at position 50 COUNT(*) tallies only those rows that contain a value, while COUNT counts all rows.TrueFalse

选项
A.True
B.False
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思路分析
In this question, we must evaluate the truth of the statement about COUNT(*) and COUNT. Option 1: True. This is not correct because COUNT(*) does not count only rows with a value; it counts every row in the result set, including rows where all colum......Login to view full explanation

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