向大牛请教一个简单的sql问题
select COUNT(*),eie_id from today group by eie_id
select COUNT(*),company from today t join eie_info eon t.eie_id=e.eie_idgroup by company
[解决办法]
select COUNT(1),b.company from today a,eie_info b where a.eie_id=b.eie_idgroup by b.company
[解决办法]
SELECT company , COUNT(*)FROM today a LEFT JOIN eie_info b ON A.eie_id = B.eie_idGROUP BY company