Question

我有三张这样的表：

专业化

sid | s_name
--------------
 1  | test 1
 2  | test 2

人

pid | name | sid
------------------
 1  | ABC  |  1
 2  | XYZ  |  2

时序

tid | time_from | time_to  | pid
----------------------------------
 1  | 08:00:00  | 10:00:00 |  1
 2  | 20:00:00  | 22:00:00 |  1
 3  | 09:00:00  | 14:00:00 |  2
 4  | 19:00:00  | 20:00:00 |  2

**我希望得到像这样的结果*

pid | name | s_name | time_from  | time_to
--------------------------------------------
 1  | ABC  | test 1 | 08:00:00   | 10:00:00

描述：
所有三个表都已连接我希望所有记录在哪里 专业化 id ='1'
人名称赞'ABC' 时间介于'08：00：00'和'10：00：00'之间。

我尝试了几种mysql连接组合，但无法正确获取数据。

Answer 1

您可以使用INNER JOIN，

SELECT  a.pid, a.name,
        b.sname,
        c.time_from,
        c.time_to
FROM    person a
        INNER JOIN specialisation b
            ON a.sid = b.sid
        INNER JOIN Timing c
            ON a.pid = c.pid
WHERE   a.sid = 1 and 
        a.name='ABC'  AND 
        c.time_from >= '08:00:00' AND c.time_to <= '10:00:00'

SQLFiddle Demo

Answer 2

您可以像这样使用简单加入

     Select P.pid , name , s_name ,time_from ,
     time_to from Specialisation S 
     Join Person P on P.sid=S.sid 
     Join Timing T on T.pid= P.pid 
     where T.time_from >= '08:00:00' AND T.time_to <='10:00:00' And P.name='ABC';

Fiddle

Answer 3

这是一个具有适当JOIN条件的直接WHERE。

 SELECT t.pid, p.name, s.s_name, t.time_from, t.time_to 
 FROM   Timing AS t
 JOIN   Person AS p ON p.pid = t.pid
 JOIN   Specialisation AS s ON s.sid = p.sid
 WHERE  s.sid = 1
    AND t.time_from >= 08:00:00 AND t.time_to <= 10:00:00

这是一个简单的条件，您必须使用JOIN来以这种方式获取数据。它非常简单，您可以在第一次使用后立即获得它。可能是这个问题，答案将帮助您理解它。

Answer 4

SELECT p.pid, p.name, s.s_name, t.time_from, t.time_to 
FROM   Timing AS t
JOIN   Person AS p ON p.pid = t.pid
JOIN   specialisation AS s ON s.sid = p.sid
WHERE  s.sid = 1 and p.name='ABC'
AND t.time_from >= '08:00:00' AND t.time_to <= '10:00:00'

Answer 5

SELECT B.PID pid, B.NAME name, A.SNAME s_name, C.TIME_FROM time_from, C.TIME_TO time_to
FROM SPECIALISATION A, PERSON B, TIMING C
WHERE A.SID = 1 AND A.SID=B.SID AND B.PID=C.PID 
AND C.TIME_FROM >=08:00:00 AND C.TIME_TO <=10.00.00

Answer 6

尝试：

    SELECT t.pid, p.name, s.s_name, t.time_from, t.time_to 
     FROM   Specialisation AS s
    left join  Person AS p ON p.sid = s.sid
    left join  Timing AS t ON t.pid = p.pid
    WHERE  s.sid = 1
        AND t.time_from >= 08:00:00' AND t.time_to <= 10:00:00
group by t.tid

Mysql连接查询三个具有多列的表

6 个答案: