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With SQL, how can you return the number of not null records in the “Persons” table?

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With SQL, how can you return the number of not null records in the “Persons” table?

(a) SELECT COUNT() FROM Persons

(b) SELECT COLUMNS() FROM Persons

(c) SELECT COLUMNS(*) FROM Persons

(d) SELECT COUNT(*) FROM Persons

I have been asked this question in class test.

I want to ask this question from Basic SQL in division Laying the Foundation of SQL Server

1 Answer

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Best answer
The correct choice is (a) SELECT COUNT() FROM Persons

For explanation: COUNT(column_name) is used to count the number of rows of a table where column name is a column that does not allow NULL values.

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