Mysql 合并三个select查询？

我想结合这三个sql查询

SELECT homeupload, COUNT(*) FROM link GROUP BY homeupload
SELECT mediaType, COUNT(*) FROM link GROUP BY mediaType
SELECT emailSub, COUNT(*) FROM link WHERE emailSub='1' GROUP BY emailSub

转换为单个查询。这可能吗？

尝试使用UNION

SELECT homeupload, COUNT(*) FROM link GROUP BY homeupload
UNION 
SELECT mediaType, COUNT(*) FROM link GROUP BY mediaType
UNION 
SELECT emailSub, COUNT(*) FROM link WHERE emailSub='1' GROUP BY emailSub

---

您是否有ER或类似的工具来显示这些表之间的关系？