從 t1 中選擇，其中 t2 內的事物計數大於零

Question

t1有id status price

t2有id status city

如果status為active並且t2.status = active計數大於0 ，則想要從t1選擇全部；

就像是：

select id, status, price from t1 where status = 'active'
AND
count of (select status from t2 where status = 'active') > 0 order by t1.price;

換句話說-如果active存在t2.status

有什么幫助嗎？

Answer 1

我認為你應該更多地向我們解釋你的問題。 但我認為這是您正在尋找的Query

SELECT TABLE1.id ,TABLE1.status ,TABLE1.price ,
if(TABLE1.status = 'active' AND (SELECT COUNT(*) FROM
(SELECT t2.* FROM t2 WHERE stackoverflow1.t2.status = 'active' > 0) t2) ,"yes","no")
FROM t1 TABLE1 ,t2 TABLE2 GROUP BY TABLE1.price 

Answer 2

SELECT id, status, price
FROM 
     Table1
WHERE status = 'active'
     AND EXISTS(
           SELECT status 
           FROM Table2
           WHERE status = 'active'
         )
ORDER BY price;