PHP get total in multiple loop - php

Question

I am using the following script where in I want the total projects of a particular branch, the tables are as follows --
Tbl_branch has -
Branch Id |
Branch Name
Tbl_employee has -
emp_id |
bid (branch id ) |
emp_details
Tbl_Project has -
id | project_details | emp_id(which employee added the project)
--
Here I want to get total projects of a particular branch where in the user will select the branch name through a dropdown and its id will be in the value.
I am using the following query
<?php
$result1 = mysql_query("select * from tbl_employee WHERE bid = '$bid'");
while ($row1 = mysql_fetch_array($result1)){
$eid = $row1['id'];
$pro = mysql_query("SELECT COUNT(id) FROM tbl_project WHERE emp_id = '$eid'") or die(mysql_error());
$rowpro = mysql_fetch_array($pro);
$totalprojectsb = $rowpro[0];
?>
<div class="card-container col-lg-3 col-md-6 col-sm-12">
<div class="card card-red hover">
<div class="front">
<h1>Total Enquires</h1>
<p id="users-count"><?php echo $totalprojectsb; ?></p>
<span class="fa-stack fa-2x pull-right">
<i class="fa fa-circle fa-stack-2x"></i>
<i class="fa fa-user fa-stack-1x"></i>
<span class="easypiechart" data-percent="100" data-line-width="4" data-size="80" data-line-cap="butt" data-animate="2000" data-target="#users-count" data-update="3000" data-bar-color="white" data-scale-color="false" data-track-color="rgba(0, 0, 0, 0.15)"></span>
</span>
</div>
<div class="back">
<ul class="inline divided">
<li>
<h1>Total Projects </h1>
<p><?php echo $totalprojectsb; ?></p>
</li>
<li>
<h1>This Month</h1>
<p><?php ?></p>
</li>
</ul>
<div class="summary negative"> <i class="fa fa-arrow-down"></i> </div>
</div>
</div>
<?php } ?>
This shows the total tile as many times as the total number of employees in that branch.
All I want here is to show one tile which will get the total number of projects from one particular branch.
I saw somewhere array could be used for such things but I am not sure how.
Please help. Also correct my question if not properly framed.

Answer 1

Well, as long as you are interested only in total number of project on particular branch, you could just change your SQL as follows:
SELECT COUNT(id)
FROM Tbl_Project
WHERE emp_id IN (
SELECT emp_id
FROM Tbl_employee
WHERE bid = '$bid'
)
This query should return total number of project on selected branch
Edit: to clarify a bit: The inner SELECT selects all employee which are working on that branch, the outer SELECT select all project, that was created by employees selected in inner SELECT (eg. project on that branch). The COUNT only count such projects.

Answer 2

You're expecting the following: "Here I want to get total projects of a particular branch where in the user will select the branch name through a dropdown and its id will be in the value." -> That is, irrelevant of which user is currently logged in, or whose projects it is, you want to classify them based on the branch they are associated with (through the various employees who belong to a given branch and have created the project).
SELECT b.branchid, b.branchname, count(p.projectid) AS branchProjects FROM tbl_employee AS e
LEFT JOIN tbl_project AS p ON p.empid = e.empid
LEFT JOIN tbl_branch AS b ON b.branchid = e.bid
GROUP BY b.branchid
With the above SQL, you will be connecting your tables and grouping the received data by the branchID, and counting the results which are connected to them.