SQL select statement with AND and OR operators issue - sql

Question

I'm fetching records from the SQL Server 2000 database using Classic ASP. This is what the code I have used.
ASP Code:
<form name="search" method="post" onsubmit="return attention();">
<table width="60%" border="0" cellpadding="2" cellspacing="0" style="margin:0 auto">
<tr>
<td colspan="2"><h1 style="color:#003399;">Search for Certificate of Analysis</h1></td>
</tr>
<tr>
<td valign="bottom">Product number <sup style="color:#EE0000;font-size:1.3em">*</sup></td>
<td valign="bottom">Lot number</td>
</tr>
<tr>
<td width="30%" valign="top">
<input type="text" name="input1" size="20"/>
</td>
<td valign="top">
<input type="text" size="20" name="input2"/>
<input style="background-color:#ffffff;border:0px;cursor:pointer" size="10" type="submit" name="sub" value=">>" />
</td>
</tr>
</table>
<%
if request.Form("sub") <> "" then
Dim fname, lname
fname= request.Form("input1")
lname= request.Form("input2")
session("n") = fname & lname
sql = "Select * from search where cat_no_batch_no LIKE '"&request.Form("input1")&"%' OR cat_no_batch_no='"&session("n")&"'"
rs.open sql, con, 1, 2
if rs.eof then
response.write("Please provide a valid Cat No.")
else
do while not rs.eof
%>
<table border="1" cellpadding="5" cellspacing="0" width="60%" style="margin:0 auto; border-collapse:collapse;border-color:#999999">
<tr>
<td width="50%"><%=rs("cat_no_batch_no")%></td>
<td width="10%">Click to open <a target="_blank" href="http://localhost/search1/<%=rs("pdf_path")%>"><%=rs("cat_no_batch_no")%></a></td>
</tr>
</table>
<%
rs.movenext
loop
end if
rs.close
end if
%>
</form>
Above the LIKE statement works as expected and displays multiple records which contains similar Cat No..
Issue rises when I input a Cat No in first Input box and Lot Number in another. My desired output should have been just a single record to display as I have given Cat No. and Lot Number , but it shows multiple records.
I have provided the images to be more clear.
In this image below I have put 6106021 as the product number so it displays two entries.
In this image I have put 6106021 as the product number and 218111 as the Lot Number, it shows two entries instead of 1. This is what the issue, it should show one entry as Lot number are unique while cat number can be the same.

Answer 1

Read your question to yourself and think about what you are saying:
You state "My desired output should have been just a single record to display as I have given Cat No. and Lot Number"
But in your SQL you write where cat_no_batch_no LIKE '"&request.Form("input1")&"%' OR cat_no_batch_no='"&session("n")&"'
The key words are AND vs. OR
In your mind you are thinking both conditions must be true, but your query says otherwise. If you want both conditions to be true then you must use the AND operator.
Naoki is on to something - you are going to have to modify your SQL depending upon which criteria are specified.

Answer 2

I guess you can write two separate SQL queries, according as the "Lot number" is provided or not.
Your code may goes like below:
if lname = "" then
sql = "Select * from search where cat_no_batch_no LIKE '"&request.Form("input1")&"%'"
else
sql = "Select * from search where cat_no_batch_no LIKE '"&session("n")&"%'"
end if
I hope this could help