Informatics Practices
With SQL, how can you return the number of not null records in the Project field of "Students" table ?
- SELECT COUNT(Project) FROM Students
- SELECT COLUMNS(Project) FROM Students
- SELECT COLUMNS(*) FROM Students
- SELECT COUNT(*) FROM Students
SQL Queries
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Answer
SELECT COUNT(Project) FROM Students
Reason — The COUNT() function in SQL counts the number of non-null records in a column. By using COUNT(Project), we are counting the number of rows where the Project column is not null in the student table.
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Related Questions
Which SQL function is used to count the number of rows in a SQL query ?
- COUNT()
- NUMBER()
- SUM()
- COUNT(*)
Which SQL statement do we use to find out the total number of records present in the table ORDERS ?
- SELECT * FROM ORDERS;
- SELECT COUNT(*) FROM ORDERS ;
- SELECT FIND (*) FROM ORDERS ;
- SELECT SUM() FROM ORDERS ;
Which of the following is not an aggregate function ?
- Avg
- Sum
- With
- Min
All aggregate functions except …………… ignore null values in their input collection.
- Count(attribute)
- Count(*)
- Avg
- Sum