Question

随着越来越多的人这样做，我将使用短信api向某些人发送他们今天的约会提醒。

所以我使用此查询时没有任何问题地获取数据：

SELECT users.id as userid, consultations.patient_id as patientid, consultations.title as patientname, patients.mphone as phone
FROM users
JOIN consultations
ON users.id = consultations.user_id
JOIN patients
ON consultations.patient_id = patients.id
WHERE users.sms > 0 AND DATE(consultations.start) = (CURDATE() + INTERVAL 1 DAY) AND patients.mphone <> ''

与此同时，我想更新咨询表，并为每个consultations.reminder = true输出的每一行设置substract 1 from users.sms和users.id ...我可以做吗？那个？

我的第一个问题是，如果我添加count()，查询会自动分组（或者只显示最后一行，不确定原因）。

如果你有建议......：）

Answer 1

我的MySQL有点生疏，但您可以将结果插入到临时表中，然后从那里更新其他表。除此之外，select语句不能修改数据。

尝试这样的事情;

CREATE TEMPORARY TABLE IF NOT EXISTS TempAppointments AS (
SELECT users.id as userid, consultations.patient_id as patientid, consultations.title as patientname, patients.mphone as phone
FROM users
JOIN consultations
ON users.id = consultations.user_id
JOIN patients
ON consultations.patient_id = patients.id
WHERE users.sms > 0 AND DATE(consultations.start) = (CURDATE() + INTERVAL 1 DAY) AND patients.mphone <> '')


UPDATE C
SET reminder = true
FROM consultations AS C INNER JOIN TempAppointments AS T ON C.user_id = T.user_id

UPDATE U
SET sms = (sms - 1)
FROM Users AS U INNER JOIN TempAppointments AS T ON U.user_id = T.user_id

请记住最后删除临时表;

DROP TEMPORARY TABLE TempAppointments

SELECT，JOIN和UPDATE同时

1 个答案: