Jan 25, 2011 · I have this SQL query: SELECT c.id as ID, c.class_name as CLASS, COUNT (e.student_id) AS STUDENT_COUNT FROM classes as c LEFT JOIN enrollments as e on …

Here we use the COUNT() function and the GROUP BY clause, to return the number of records for each category in the Products table: Example SELECT COUNT(*) AS [Number of records], …

Total Number of records in our student table. SELECT COUNT ( * ) AS total_record FROM student Output of above query is here.

Nov 16, 2024 · The COUNT(*) function returns the total number of records in the Enrollments table that match the condition course_id = 1. The result is labeled as total_students to show …

Mar 9, 2014 · You could either add it to both of the WHERE clauses OR add st_class to the SELECT clause and wrap the entire query in another select statement: SELECT * FROM ( …

May 23, 2024 · SELECT COUNT(student_id) AS enrolled_students FROM students WHERE class_id = 'your_class_id'; In this query, we are counting the number of rows in the students …

Sep 11, 2024 · The COUNT() function in MySQL is used to count the total number of rows that meet a specific condition or criteria. It is a commonly used aggregate function in SQL queries …

The COUNT() function returns the number of rows that matches a specified criterion. The AVG() function returns the average value of a numeric column. The SUM() function returns the total …

To calculate the total number of query results, you can use the COUNT (*) function to count the number of rows in the query result set. For example, here is a sample query used to calculate …

Dec 20, 2017 · SELECT c.class_name "Class Name", count(distinct j.student_id) "Number of Students" FROM class c LEFT JOIN junction j ON j.class_id = c.class_id GROUP BY 1