Question

我有三张桌子（医生，clinic_doctor_timings，hosptial_doctor_timings）。两个时间表都包含医生表的id作为外键，它还存储医生的起点和时间。现在我需要选择在给定时间内去诊所或医院的医生身份证，即来往。

我写了一个查询，既可以用于诊所，也可以用于医院，但不能同时用于两者。

SELECT 
DISTINCT
SQL_CALC_FOUND_ROWS
`doctor`.`id`,
`doctor`.`name`
FROM
`doctor`
JOIN clinic_doctor_timings AS cl
ON cl.doctor_id = doctor.id
WHERE
TIME_FORMAT(`cl`.`from`, %h:%i %p) >= '05:00 AM'
AND TIME_FORMAT(`cl`.`to`, %h:%i %p) >= '10:00 PM'

上面的查询工作正常，但在我想要将clinic_doctor_timings和hospital_doctor_timings表结合起来后，我得不到我期望的结果。

.........
JOIN clinic_doctor_timings AS cl
ON cl.doctor_id = doctor.id
JOIN hospital_doctor_timings AS hs
ON hs.doctor_id = doctor.id
WHERE
(TIME_FORMAT(`cl`.`from`, %h:%i %p) >= '05:00 AM'
AND TIME_FORMAT(`cl`.`to`, %h:%i %p) <= '10:00 PM')
XOR
(TIME_FORMAT(`hs`.`from`, %h:%i %p) >= '05:00 AM'
AND TIME_FORMAT(`hs`.`to`, %h:%i %p) <= '10:00 PM')

我需要让诊所和医院为医生提供给定时间，而不依赖于诊所和医院。

Answer 1

去看诊所的医生：

SELECT a.id, a.name FROM doctor a 
INNER JOIN clinic_doctor_timings b ON a.id = b.doctor_id
WHERE 
b.`from` >= '2013-05-02 05:00:00' AND
b.`to` <= '2013-05-02 22:00:00';

找到去医院的医生：

SELECT a.id, a.name FROM doctor a 
INNER JOIN hospital_doctor_timings b ON a.id = b.doctor_id
WHERE 
b.`from` >= '2013-05-02 05:00:00' AND
b.`to` <= '2013-05-02 22:00:00';

找到去诊所和医院的医生

SELECT a.id, a.name FROM doctor a 
INNER JOIN clinic_doctor_timings b ON a.id = b.doctor_id
INNER JOIN hospital_doctor_timings c ON a.id = c.doctor_id
WHERE 
b.`from` >= '2013-05-02 05:00:00' AND
b.`to` <= '2013-05-02 22:00:00' AND
c.`from` >= '2013-05-02 05:00:00' AND
c.`to` <= '2013-05-02 22:00:00';

让去诊所的医生 OR 医院

SELECT a.id, a.name FROM doctor a 
WHERE
(
    SELECT COUNT(b.id) FROM clinic_doctor_timings b WHERE
    b.doctor_id = a.id and
    b.`from` >= '2013-05-02 05:00:00' AND
    b.`to` <= '2013-05-02 22:00:00'
) > 0
or
(
    SELECT COUNT(c.id) FROM hospital_doctor_timings c WHERE
    c.doctor_id = a.id and
    c.`from` >= '2013-05-02 05:00:00' AND
    c.`to` <= '2013-05-02 22:00:00'
) > 0;

这不足以得到你想要的东西吗？

在mysql中将两个表与一组条件组合在一起

1 个答案: