sql count having
-- Classes with more than 10 students SELECT student_class, COUNT(*) FROM students GROUP BY student_class HAVING count(*) > 10;
sql count having
-- Classes with more than 10 students SELECT student_class, COUNT(*) FROM students GROUP BY student_class HAVING count(*) > 10;
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;
SQL only show where count is great than 1
SELECT COUNT( * ) FROM agents HAVING COUNT(*)>1; --count is greater than 1
mysql HAVING
SELECT colonne1, SUM(colonne2) FROM nom_table GROUP BY colonne1 HAVING fonction(colonne2) operateur valeur
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