SQL Results in table cells grouped by date in <TR> - php

Question

I have a table in SQL Server with this fields and values.
ID_Employee | ID_Company | Date | Concept | Hours
--------------------------------------------------------
1 | 1 | 14/03/2013 | 1 | 8
1 | 1 | 14/03/2013 | 2 | 0
1 | 1 | 14/03/2013 | 3 | 3
1 | 1 | 14/03/2013 | 4 | 1
1 | 1 | 16/03/2013 | 1 | 5
1 | 1 | 16/03/2013 | 2 | 2
1 | 1 | 16/03/2013 | 3 | 0
1 | 1 | 16/03/2013 | 4 | 0
What I need is to display the values where ID_Employee=1 and ID_Company=1 ​​in a HTML table grouping the rows by date, and ordering the hours in his column as the value of their concept.
Date | Concept_1 | Concept_2 | Concept_3 | Concept_4 |
------------------------------------------------------------
14/03/2013 | 8 hours | 0 hours | 3 hours | 1 hour |
16/03/2013 | 5 hours | 2 hours | 0 hours | 0 hours |
I don't know how to do the query or what statement (while,for,foreach) to use in php to create 1 row (<tr>) for each different date, containing a single cell (<td>) for each concept and hour.
The html should look like this:
<tr id="14/03/2013">
<td class="concept_1">8 hours</td>
<td class="concept_2">0 hours</td>
<td class="concept_3">3 hours</td>
<td class="concept_4">1 hour</td>
</tr>
<tr id="16/03/2013">
<td class="concept_1">5 hours</td>
<td class="concept_2">2 hours</td>
<td class="concept_3">0 hours</td>
<td class="concept_4">0 hour</td>
</tr>
It may be easy, but now I'm a bit confused and I can't find the solution.

Answer 1

You're looking for a PIVOT operator wich allows you do desired stuff. You can use following query:
select
pvt.date,
[1] AS concept_1,
[2] AS concept_2,
[3] AS concept_3,
[4] AS concept_4
from
(
SELECT
date,
hours,
concept
FROM table1
) p
PIVOT
(
AVG(hours)
FOR concept IN
([1], [2], [3], [4])
) as pvt
Providing SqlFiddle as well.

Answer 2

Check this:
declare #tableHTML nvarchar(MAX);
set #tableHTML = CAST((
select
1 AS Tag,
NULL AS Parent,
pvt.[date] AS 'tr!1!id',
ltrim(rtrim(str([1])))+ ' hours' AS 'tr!1!td class="concept_1"!Element',
ltrim(rtrim(str([2])))+ ' hours' AS 'tr!1!td class="concept_2"!Element',
ltrim(rtrim(str([3])))+ ' hours' AS 'tr!1!td class="concept_3"!Element',
ltrim(rtrim(str([4])))+ ' hours' AS 'tr!1!td class="concept_4"!Element'
from
(
SELECT
date,
hours,
concept
FROM table1
) p
PIVOT
(
AVG(hours)
FOR concept IN
([1], [2], [3], [4])
) as pvt
FOR XML EXPLICIT) AS NVARCHAR(MAX));
PRINT REPLACE(REPLACE(REPLACE(REPLACE(#tableHTML, '</td class="concept_1">', '</td>'), '</td class="concept_2">', '</td>'), '</td class="concept_3">', '</td>'), '</td class="concept_4">', '</td>');
Ouput:
<tr id="2013-03-14">
<td class="concept_1">8 hours</td>
<td class="concept_2">0 hours</td>
<td class="concept_3">3 hours</td>
<td class="concept_4">1 hours</td>
</tr>
<tr id="2013-03-16">
<td class="concept_1">5 hours</td>
<td class="concept_2">2 hours</td>
<td class="concept_3">0 hours</td>
<td class="concept_4">0 hours</td>
</tr>
I used the pivot proposed by #Sergio - thanks a lot (+1)