Consider the table CLUB given below and write the output of the SQL queries that follow.
(i) SELECT COUNT(DISTINCT SPORTS) FROM CLUB;
Answer by student
The output of the SQL query is:
Detailed answer by teachoo
- The given SQL query is a SELECT statement that retrieves data from the table CLUB .
- The COUNT() function is used to count the number of rows that match a specified condition. In this case, the condition is DISTINCT SPORTS , which means that only the unique values of the SPORTS column are counted.
- The DISTINCT keyword is used to eliminate duplicate values from the result set. In this case, it ensures that each sport is counted only once, regardless of how many times it appears in the table.
- The result of the query is a single value that represents the number of distinct sports in the table. To find this value, we can look at the SPORTS column and identify the unique values. They are: CHESS , CRICKET , VOLLEYBALL , and KARATE . Therefore, the number of distinct sports is 4.
So, the correct output of the SQL query is: