某種聯接語句？

Question

如何將這兩個查詢放入單個查詢中？

select count(id) as cnt from {$site_id}.proofingv2_packages where active='1' 
select count(id) as cnt from {$site_id}.proofingv2_package_options where active='1' and parent={$row["id"]} order by sort 

$row['id']是來自第一個查詢的id字段。我試圖確定是否有任何有效的軟件包。有效的軟件包必須處於活動狀態，並且至少有一個活動選項。爲此運行2個查詢似乎不正確。

任何人都可以幫忙嗎？

Answer 1

select count(id) as cnt from 
{$site_id}.proofingv2_packages pp 
INNER JOIN 
{$site_id}.proofingv2_package_options 
pt ON pp.active = pt.Active AND 
pp.Active = 1 

如果id爲這兩個表上相同的PK或FK使用此查詢

select count(id) as cnt from 
    {$site_id}.proofingv2_packages pp 
    INNER JOIN {$site_id}.proofingv2_package_options pt ON pp.id= pt.id 
    AND pp.Active = 1 

Answer 2

SELECT IF(count(*) > 0, 1, 0) AS isValid 
FROM {$site_id}.proofingv2_packages pp 
INNER JOIN {$site_id}.proofingv2_package_options ppo ON ppo.parent = pp.id 
WHERE pp.active = '1' 
AND ppo.active = '1' 

這應該返回1，如果有有效的包或0，如果沒有