Informatics Practices
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 ;
Answer
SELECT COUNT(*) FROM ORDERS ;
Reason — The COUNT() function in SQL counts the number of rows or records in a table. When used with the asterisk (*), it counts all rows in the table, including duplicates and nulls. Therefore, SELECT COUNT(*) FROM ORDERS will return the total number of records in the ORDERS table.
Related Questions
Select correct SQL query from below to find the temperature in increasing order of all cities.
SELECT city FROM weather ORDER BY temperature ;
SELECT city, temperature FROM weather ;
SELECT city, temperature FROM weather ORDER BY temperature ;
SELECT city, temperature FROM weather ORDER BY city ;
Which SQL function is used to count the number of rows in a SQL query ?
- COUNT()
- NUMBER()
- SUM()
- COUNT(*)
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
Which of the following is not an aggregate function ?
- Avg
- Sum
- With
- Min