Can you please help me for this

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Hello Friends,

I got stuck in the following query, Kindly do the needful...

Following is my Table :

SQL

CREATE TABLE IF NOT EXISTS `exam_marks` (
  `emid` int(11) NOT NULL AUTO_INCREMENT,
  `eid` int(11) NOT NULL,
  `sid` int(11) NOT NULL,
  `mark` float NOT NULL,
  PRIMARY KEY (`emid`)
)

And Data....

SQL

INSERT INTO `exam_marks` (`emid`, `eid`, `sid`, `mark`) VALUES
(1, 3, 28, 15),
(2, 3, 29, 2),
(3, 3, 30, 15),
(4, 3, 31, 14),
(5, 3, 32, 15),
(6, 3, 33, 6),
(7, 3, 34, 15),
(8, 3, 35, 15),
(9, 3, 36, 15),
(10, 3, 37, 10),
(11, 3, 38, 11),
(12, 3, 39, 12),
(13, 3, 40, 13),
(14, 3, 41, 14),
(15, 3, 42, 15),
(16, 3, 43, 16),
(17, 3, 44, 17),
(18, 3, 45, 18),
(19, 3, 46, 19),
(20, 3, 47, 20),
(82, 7, 29, 10),
(84, 7, 31, 10),
(86, 7, 33, 15),
(90, 7, 37, 22),
(91, 7, 38, 33),
(92, 7, 39, 22),
(93, 7, 40, 22),
(94, 7, 41, 22);

Eid 3 means its regular Exam and Eid 7 means its remedial exam... I want to prepare following report :
**************************** output i want is as follow*********
Sid reg rem
28 15 Null
29 2 10
30 15 Null
..
..
..
..
..

Thanks in advance,

Posted 27-Nov-13 17:47pm

compad

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Comments

walterhevedeich 28-Nov-13 0:12am

Tried anything?

2 solutions

Solution 2

This is one situation where CASE[^] would be helpful. Let's say you have a table with the following data:

User

ID Name    Age
1  Bob     18
2  Chelsey 22
3  Rick    16

and you want a report that checks if the entries on the table are minors

Name   Minor

Using CASE, you can write the following query:

SQL

SELECT Name, 
CASE
   WHEN Age < 18 THEN 'Yes'
   ELSE 'No'
END As Minor
FROM User

Output will be

Name    Minor
Bob     No
Chelsey No
Rick    Yes

Posted 27-Nov-13 18:32pm

walterhevedeich

Comments

thatraja 28-Nov-13 1:21am

Nice one. 5!
Sorry Walter, I forgot to reply your mail, I'll soon.

walterhevedeich 28-Nov-13 1:26am

Thanks. It's OK. Hope you are doing fine there.

thatraja 28-Nov-13 1:28am

Ofcourse, more than fine. Will PM with more details

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compad · Accepted Answer · 2013-11-27T18:21:00

Solution 1

I wrote following query... but it shows me only records exist in both :

SQL

select a.sid, a.mark as regmark, ifnull(b.mark,"") as remmark from exam_marks a, exam_marks b where a.sid = b.sid and a.eid=3 and b.eid=7

output :

sid	regmark	remmark
31	14	10
32	5	10
33	6	15

I want to include null values for column remmarks also.

Posted 27-Nov-13 18:21pm

compad

Updated 27-Nov-13 19:59pm

v2

Comments

walterhevedeich 28-Nov-13 0:35am

Next time, don't put it as solution if this is not the answer to your inquiry. Use Improve solution to update your question with recent information. I have provided an explanation on how you can accomplish it. It's by using CASE.

compad 28-Nov-13 1:26am

Okey... Thanks for suggestions..

walterhevedeich 28-Nov-13 1:27am

No problem.