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CREATE TABLE Test (Person_id INTEGER, Name VARCHAR(13), Recruited_by VARCHAR(4)); INSERT INTO Test (Person_id, Name, Recruited_by) VALUES ('1', 'Jean Grayson', '1'), ('2', 'Paul Smith', '7'), ('3', 'John Do', null), ('4', 'Alex Lee', '7'), ('5', 'Lisa Kim', '7'), ('6', 'Bob Thompson', '3'), ('7', 'Mike Keen', null), ('8', 'Raymond Red', '3'), ('9', 'Alisson Jones', '1'), ('10', 'Kate James', '3');
Records: 10 Duplicates: 0 Warnings: 0
SELECT GROUP_CONCAT(CASE WHEN t2.Recruited_by IS NOT NULL THEN t1.Name END ORDER BY t1.Name) names, SUM(t1.Recruited_by IS NULL) total_not_recruited FROM Test t1 LEFT JOIN ( SELECT Recruited_by FROM Test GROUP BY Recruited_by HAVING COUNT(*) > 3 ) t2 ON t2.Recruited_by = t1.Person_id;
names
total_not_recruited
null
2