having count sql code example

Example 1: sql count having

-- Classes with more than 10 students
SELECT student_class, COUNT(*) FROM students GROUP BY student_class 
	HAVING count(*) > 10;

Example 2: sql count

/*COUNT(column_name) will return the number of rows from the column 
that are not NULL*/
SELECT COUNT(column_name)
FROM table_name;

/*COUNT(*) will return the number of rows from the table*/
SELECT COUNT(*)
FROM table_name;

Example 3: SQL only show where count is great than 1

SELECT COUNT( * ) 
FROM agents 
HAVING COUNT(*)>1; --count is greater than 1

Example 4: mysql HAVING

SELECT colonne1, SUM(colonne2)
FROM nom_table
GROUP BY colonne1
HAVING fonction(colonne2) operateur valeur