Mysql join query on three tables with multiple columns

Question

I have three tables like this:

Specialisation

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

Person

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

Timing

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

**I want to get result something like this*

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

Description:
All three tables are connected.
I want all records where
specialisation id = '1'
person name Like 'ABC'
timing is in between '08:00:00' and '10:00:00'.

I tried several combinations of mysql joins but not able to fetch the data correctly.

what is the data time `time_from` and `time_to`? – John Woo Nov 09 '12 at 06:07 — John Woo, Nov 09 '12 at 06:07

John Woo · Accepted Answer · 2012-11-09T06:10:12.823

23

You can use INNER JOIN for this,

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

edited Nov 09 '12 at 06:10

answered Nov 09 '12 at 06:02

John Woo

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@AnandPhadke they both perform the same since we are both using `INNER JOIN`. – John Woo Nov 09 '12 at 06:39

thar45 · Answer 2 · 2012-11-09T06:42:24.650

1

You can use Simple Join like this

     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

edited Nov 09 '12 at 06:42

answered Nov 09 '12 at 06:07

thar45

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nawfal · Answer 3 · 2012-11-09T06:34:01.203

0

This is a straight forward JOIN with appropriate WHERE condition.

 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

This is a simple condition where you have to use JOINs to fetch data this way. Its so simple that you will get a hang of it right after your first use. May be this question and answers will help you understand it.

edited Nov 09 '12 at 06:34

answered Nov 09 '12 at 06:04

nawfal

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Why downvote? :o. If not the perfect answer, doesn't this guide OP to right direction? And pretty much all the answers that came after uses the same ditto code! – nawfal Nov 09 '12 at 06:24

AnandPhadke · Answer 4 · 2012-11-09T06:42:34.643

0

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'

edited Nov 09 '12 at 06:42

answered Nov 09 '12 at 06:06

AnandPhadke

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2

`pid` will be ambiguous to select use alias @AnandPhadke – thar45 Nov 09 '12 at 06:34
Thangs-Thanks for poining out this – AnandPhadke Nov 09 '12 at 06:36

score 0 · Answer 5 · answered Nov 09 '12 at 06:09

0

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

answered Nov 09 '12 at 06:09

Shamis Shukoor

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score 0 · Answer 6 · answered Nov 09 '12 at 06:10

Try :

    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 join query on three tables with multiple columns

6 Answers6

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