PHP MySQL join two tables query - php

Question

I have two tables ie abstract table and author with one to many relation, for each iteration on while loop I want to display a html table of unique row of data from abstract table with corresponding rows from author table.
This what I did:
public function getAll() {
try {
$sql = " SELECT tbl_abstract.abstract_id, tbl_abstract.first_name,
tbl_abstract.last_name,tbl_abstract.content,
tbl_author.afirst_name, tbl_author.alast_name,
tbl_author.aaffilition
FROM tbl_abstract
INNER JOIN tbl_author ON tbl_abstract.abstract_id = tbl_author.abstract_id
GROUP BY tbl_abstract.abstract_id";
$stmt= $this->pdo->prepare($sql);
$stmt->execute();
$count = $stmt ->rowCount();
while($row = $stmt->fetch(PDO::FETCH_ASSOC)){
?>
<table class="table" >
<tr>
<td align="center" >
//data from tbl_abstract
<?php echo $row["abstract_id"]; ?>. <?php print($row["abstract_title"]); ?>
<?php echo $row["first_name"].' '.$row["last_name"]; ?>,
//data from tbl_author
<?php echo $row["afirst_name"].' '.$row["alast_name"];?>
</td>
</tr>
<tr>
<td align="center" ">
//data from tbl_abstract
<?php print($row["content"]); ?>
</td>
</tr>
</table>
<?php
}
}catch(PDOException $e){
echo $e->getMessage();
return false;
}
}
There are three records from tbl_author associated with the abstract_id from tbl_abstract but i only get one record instead of 3 of them.Please help

Answer 1

Try this one :-
<?php
$sql = "SELECT *
FROM tbl_abstract
where abstract_id IN (SELECT distinct abstract_id
FROM tbl_abstract)";
$stmt= $this->pdo->prepare($sql);
$stmt->execute();
$count = $stmt ->rowCount();
?>
<table class="table" >
while($row = $stmt->fetch(PDO::FETCH_ASSOC)){
?>
<tr>
<td align="center" >
//data from tbl_abstract
<?php echo $row["abstract_id"]; ?> <?php print($row["abstract_title"]); ?>
<?php echo $row["first_name"].' '.$row["last_name"]; ?>,
<?php
$sql1 = "SELECT *
FROM tbl_author
WHERE abstract_id = '".$row["abstract_id"]."'" ;
$stmt1= $this->pdo->prepare($sql1);
$stmt1->execute();
while($row1 = $stmt1->fetch(PDO::FETCH_ASSOC)){
//data from tbl_author
echo $row1["afirst_name"].' '.$row1["alast_name"];
} ?>
</td>
<td align="center">
//data from tbl_abstract
<?php print($row["content"]); ?>
</td>
</tr>
<?php } ?>
</table>

Answer 2

Try removing the GROUP BY clause like this:
SELECT
tbl_abstract.abstract_id, tbl_abstract.first_name,
tbl_abstract.last_name,tbl_abstract.content, tbl_author.afirst_name,
tbl_author.alast_name, tbl_author.aaffilition
FROM
tbl_abstract
INNER JOIN
tbl_author ON tbl_abstract.abstract_id = tbl_author.abstract_id
Group by is grouping all the authors by the field abstract_id, which means, that it won't return all the authors, but only one for one abstract_id (based on the sorting field, which in this case is probably the primary key, because it is not explicitly defined)..