MySQL Error: Duplicate 'Candidate Name' - php

Question

I have created a MySQL database along with a front-end to manipulate it using PHP. However, while I can add content to the database manually, I cannot utilize my front-end. When I try to submit the data in my front-end's form fields, I receive the prompt "Duplicate Candidate Name."
The following PHP file is my general script for displaying the front-end:
<?php
if(isset($_POST['sbmtbtn']) && ($_POST['sbmtbtn'] != ""))
{
$desc = strip_tags($_POST['txtdesc']);
$date = glb_func_chkvl($_POST['txtdate']);
$first = glb_func_chkvl($_POST['txtfirst']);
$last = glb_func_chkvl($_POST['txtlast']);
$skill = glb_func_chkvl($_POST['txtskill']);
$sub1 = glb_func_chkvl($_POST['txtsub1']);
$sub2 = glb_func_chkvl($_POST['txtsub2']);
$person = glb_func_chkvl($_POST['txtperson']);
$company = glb_func_chkvl($_POST['txtcompany']);
$location = glb_func_chkvl($_POST['txtlocation']);
$complex = glb_func_chkvl($_POST['complex']);
$sts = glb_func_chkvl($_POST['lststs']);
$dt = date('Y-m-d');
$emp = $_SESSION['sesadmin'];
$sqryquestion_info
= "SELECT candi_first
FROM question_info
WHERE candi_first='$first'";
if(isset($_POST['frmtyp']) && ($_POST['frmtyp'] == "add"))
{
$srsquestion_info =mysql_query($sqryquestion_info);
$rows = mysql_num_rows($srsquestion_info);
if($rows > 0)
{
$gmsg = "<font color=red size=2>Duplicate Candidate Name . Record not saved</font>";
}
else
{
$iqryquestion_info="insert into question_info(
candi_first,candi_last,date,
skill,subtype_1,
subtype_2,person_int,
comp_name,loc_int,complex_lvl,
type_int,question_candi,q_crton,
q_crtby)
values('$first','$last','$date','$skill','$sub1','$sub2','$person','$company',
'$location','$complex','$sts','$desc','$dt','$emp')";
$irsquestion_info = mysql_query($iqryquestion_info);
if($irsquestion_info==true)
{
$gmsg = "<font color=green size=2>Record saved successfully</font>";
}
else
{
$gmsg = "<font color=red size=2>Record not saved</font>";
}
}
}
if(isset($_POST['frmtyp']) && ($_POST['frmtyp'] == "edit"))
{
$id = $_REQUEST['hdnedit'];
$pg = $_REQUEST['hdnpg'];
$countstart = $_REQUEST['hdncntstrt'];
$sqryquestion_info .=" and ques_id !=$id";
$srsquestion_info = mysql_query($sqryquestion_info);
$rows = mysql_num_rows($srsquestion_info);
if($rows > 0)
{
?>
<script>location.href="view_all_questions.php?sts=d&pg=<?php echo $pg;?>&countstart=<?php echo $countstart;?><?php echo $srchval;?>";</script>
<?php
}
else
{
$uqryquestion_info="update question_info set
date ='$date',
candi_first ='$first',
candi_last ='$last',
skill ='$skill',
subtype_1 ='$sub1',
subtype_2 ='$sub2',
person_int ='$person',
comp_name ='$company',
loc_int ='$location',
complex_lel ='$complex',
type_int ='$company',
question_candi ='$desc',
q_mdfdon ='$dt',
q_mdfdby ='$emp' ";
$uqryquestion_info .= " where ques_id=$id";
$ursquestion_info = mysql_query($uqryquestion_info);
if($ursquestion_info==true)
{
?>
<script>location.href="view_all_questions.php?sts=y&pg=<?php echo $pg;?>&countstart=<?php echo $countstart;?><?php echo $srchval;?>";
</script>
<?php
}
else
{
?>
<script>location.href="view_all_questions.php?sts=n&pg=<?php echo $pg;?>&countstart=<?php echo $countstart;?><?php echo $srchval;?>";
</script>
<?php
}
}
}
/*********************************** End Editing ******************************************************/
}
?>
Here begins my "main file" for editing:
<?php
if(isset($_POST['sbmtbtn']) && ($_POST['sbmtbtn'] != ""))
{
$desc = strip_tags($_POST['txtdesc']);
$date = glb_func_chkvl($_POST['txtdate']);
$first = glb_func_chkvl($_POST['txtfirst']);
$last = glb_func_chkvl($_POST['txtlast']);
$skill = glb_func_chkvl($_POST['txtskill']);
$sub1 = glb_func_chkvl($_POST['txtsub1']);
$sub2 = glb_func_chkvl($_POST['txtsub2']);
$person = glb_func_chkvl($_POST['txtperson']);
$company = glb_func_chkvl($_POST['txtcompany']);
$location = glb_func_chkvl($_POST['txtlocation']);
$complex = glb_func_chkvl($_POST['complex']);
$sts = glb_func_chkvl($_POST['lststs']);
$dt = date('Y-m-d');
$emp = $_SESSION['sesadmin'];
$sqryquestion_info="select candi_first
from question_info
where candi_first='$first'";
if(isset($_POST['frmtyp']) && ($_POST['frmtyp'] == "add"))
{
$srsquestion_info =mysql_query($sqryquestion_info);
$rows = mysql_num_rows($srsquestion_info);
if($rows > 0)
{
$gmsg = "<font color=red size=2>Duplicate Candidate Name . Record not saved</font>";
}
else
{
$iqryquestion_info="insert into question_info(
candi_first,candi_last,date,
skill,subtype_1,
subtype_2,person_int,
comp_name,loc_int,complex_lvl,
type_int,question_candi,q_crton,
q_crtby)
values('$first','$last','$date','$skill','$sub1','$sub2','$person','$company',
'$location','$complex','$sts','$desc','$dt','$emp')";
$irsquestion_info = mysql_query($iqryquestion_info);
if($irsquestion_info==true)
{
$gmsg = "<font color=green size=2>Record saved successfully</font>";
}
else
{
$gmsg = "<font color=red size=2>Record not saved</font>";
}
}
}
if(isset($_POST['frmtyp']) && ($_POST['frmtyp'] == "edit"))
{
$id = $_REQUEST['hdnedit'];
$pg = $_REQUEST['hdnpg'];
$countstart = $_REQUEST['hdncntstrt'];
$sqryquestion_info .=" and ques_id !=$id";
$srsquestion_info = mysql_query($sqryquestion_info);
$rows = mysql_num_rows($srsquestion_info);
if($rows > 0)
{
?>
<script>location.href="view_all_questions.php?sts=d&pg=<?php echo $pg;?>&countstart=<?php echo $countstart;?><?php echo $srchval;?>";</script>
<?php
}
else
{
$uqryquestion_info="update question_info set
date ='$date',
candi_first ='$first',
candi_last ='$last',
skill ='$skill',
subtype_1 ='$sub1',
subtype_2 ='$sub2',
person_int ='$person',
comp_name ='$company',
loc_int ='$location',
complex_lel ='$complex',
type_int ='$company',
question_candi ='$desc',
q_mdfdon ='$dt',
q_mdfdby ='$emp' ";
$uqryquestion_info .= " where ques_id=$id";
$ursquestion_info = mysql_query($uqryquestion_info);
if($ursquestion_info==true)
{
?>
<script>location.href="view_all_questions.php?sts=y&pg=<?php echo $pg;?>&countstart=<?php echo $countstart;?><?php echo $srchval;?>";
</script>
<?php
}
else
{
?>
<script>location.href="view_all_questions.php?sts=n&pg=<?php echo $pg;?>&countstart=<?php echo $countstart;?><?php echo $srchval;?>";
</script>
<?php
}
}
}
/*********************************** End Editing ******************************************************/
}
?>