Compare two table row values ColdFusion? - sql

Question

I have two queries and each query is outputted on the screen in separate table. Both quires have the same number of records but I would like to check if each field is equal if not I want to set different background color for that table row. Here is the code that I have so far:
<cfquery name="oldData" datasource="test">
SELECT
old_id,
old_userid,
old_first,
old_last,
old_dob
FROM OldTest
</cfquery>
<cfquery name="newData" datasource="test">
SELECT
new_id,
new_userid,
new_first,
new_last,
new_dob
FROM NewTest
</cfquery>
And here is code for both tables:
<table>
<tr>
<td valign="top">
<table class="oldData">
<caption>Old Data</caption>
<thead>
<tr>
<th>ID</th>
<th>UserID</th>
<th>First</th>
<th>Last</th>
<th>DOB</th>
<tr>
</thead>
<tbody>
<cfoutput query="oldData">
<tr>
<td>#old_id#</td>
<td>#Trim(old_userid)#</td>
<td>#Trim(old_first)#</td>
<td>#Trim(old_last)#</td>
<td>#Trim(old_dob)#</td>
</tr>
</cfoutput>
</tbody>
</table>
</td>
<td valign="top">
<table class="newData">
<caption>New Data</caption>
<thead>
<tr>
<th>ID</th>
<th>UserID</th>
<th>First</th>
<th>Last</th>
<th>DOB</th>
<tr>
</thead>
<tbody>
<cfoutput query="newData">
<tr>
<td>#new_id#</td>
<td>#Trim(new_userid)#</td>
<td>#Trim(new_first)#</td>
<td>#Trim(new_last)#</td>
<td>#Trim(new_dob)#</td>
</tr>
</cfoutput>
</tbody>
</table>
</td>
</tr>
</table>
I'm wondering if I should compare data rows before the output something like:
<cfif oldData.old_first[currentrow] NEQ newData.new_first[currentrow]>
<cfset rowColor = "red">
</cfif>
Or there is better way to approach this. If anyone knows better way please let me know.

Answer 1

I would use looping:
<cfloop from="1" to="#oldData.recordCount#" index="r">
Question #oldData.old_id[r]# = #oldData.new_id[r]#? Answer: #oldData.old_id[r] eq oldData.new_id[r]#<br>
</cfloop>
You can wrap the loop around TRs and TDs if you desire.
This method also eliminates the need for a QofQ, which are resource intensive.

Answer 2

I suggest a query of queries resembling this:
select 'same' comparison, field1, field2, etc
from query1, query2
where query1.someField = query2.someField
union
select 'different' comparison, field1, field2, etc
from query1
where somefield not in (<cfqueryparam value="#valueList(query2.someField#") list = true>
Your table row colour can be specified with a ternary operator.
<tr bgcolor="#comparison is 'same' ? 'white' : 'red'#">