Which SQL function is used to count the number of rows in a SQL query?COUNT()NUMBER()SUM()COUNT(*)
Question
Which SQL function is used to count the number of rows in a SQL query?
COUNT()
NUMBER()
SUM()
COUNT(*)
Solution
The SQL function used to count the number of rows in a SQL query is COUNT()
.
Explanation:
- COUNT() is a standard SQL aggregate function designed to return the number of rows that meet a specified criterion within a table or the total number of rows in a dataset.
- COUNT(*) is a specific usage of the COUNT function, which counts all rows in the result set, including those with NULL values in any columns.
Given the options provided, both COUNT()
and COUNT(*)
are correct, with COUNT(*)
being the most common expression to count all rows.
In conclusion, the most appropriate answer among the options is COUNT()
, with COUNT(*)
as a specific case for counting all rows.
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