将用户状态作为SQL查询的一部分进行检查

Question

我正在运行一个SQL查询，该查询显示凭证集合，按照凭单在另一个数据库中使用的次数为0的顺序排列。

虽然最后一步，我想检查相应的'voucher_credits.user_id'的'user.state'仍然'活跃'，我该如何加入？

SELECT vouchers.code, count(voucher_credits.voucher_id) as Activated 
    FROM vouchers, voucher_credits, users 
    WHERE vouchers.code LIKE '%sentme%' 
     AND vouchers.id = voucher_credits.voucher_id 
     AND voucher_credits.remaining_credit = 0 
     AND *** the user.state of voucher_credits.user is 'active' *** 
    GROUP by vouchers.code 
    ORDER by count(voucher_credits.voucher_id) DESC 
    LIMIT 50 

Answer 1

尝试类似，

SELECT vouchers.code, count(voucher_credits.voucher_id) as Activated 
FROM vouchers, voucher_credits, users 
WHERE vouchers.code LIKE '%sentme%' 
    AND vouchers.id = voucher_credits.voucher_id 
    AND voucher_credits.remaining_credit = 0 
    AND users.id = voucher_credits.user_id AND user.state = 'active' 
GROUP by vouchers.code 
ORDER by count(voucher_credits.voucher_id) DESC 
LIMIT 50