Which of the following aggregate functions is used to find the total number of rows in a table, even if some columns contain null values?SUMCOUNTAVGMAX
Question
Which of the following aggregate functions is used to find the total number of rows in a table, even if some columns contain null values?
SUMCOUNTAVGMAX
Solution
To determine which aggregate function is used to find the total number of rows in a table, even if some columns contain null values, let's analyze the options provided:
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SUM - This function adds up all the values in a specified column. However, it does not count null values and is not intended for counting rows.
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COUNT - This function counts the number of entries in a specified column. If you use
COUNT(*), it counts all rows in the table, including those with null values in other columns, making it suitable for this purpose. -
AVG - This function calculates the average of a specified column. Like SUM, it ignores null values but does not count rows.
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MAX - This function finds the maximum value in a specified column. It also ignores null values and is not used for counting rows.
Final Answer
The correct aggregate function to find the total number of rows in a table, including rows with null values, is COUNT.
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