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Editorial Team
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Asked: 2026-06-13T06:23:22+00:00

I have 15 tables with different column counts in mysql. Column count ranges from

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I have 15 tables with different column counts in mysql. Column count ranges from 225 to 250. I am importing data from 15 different CSV files on a daily basis.

All the tables have 19 common columns with the same values for particular day and a combination of 3 common columns can act as primary key.

I need to fetch the data from 15 tables without duplication to display it as a report. How to do this?

For the reference sample table structure is below:

<html>
<table cellpadding="0" cellspacing="auto" border="1" class="display" id="example" width="100%">
            <thead>
                <tr>
                        <th>Start time </th>
                        <th>End time </th>
                        <th>Query Granularity</th>
                        <th>RNC ID</th>
                        <th>Cell</th>
                        <th>Cellname</th>
                        <th>Access Success Rate Signalling (%)</th>
                        <th>Access Success Rate Speech (%)</th> 
                        <th>Access Success Rate PS (%)</th>
                        <th>Access Success Rate HS (%)</th>
                        <th>Call Drop Rate Speech (%)</th>
                        <th>Call Drop Rate PS (%)</th>
                        <th>Call Drop Rate HS (%)</th>
                        <th>HOSR Speech (%)</th>
                        <th>iRAT HOSR out Speech (%)</th>
                        <th>iRAT HOSR out PS R99 (%)</th>
                        <th>number of rab establishment success for speech</th> 
                        <th>number of rab establishment success for PS</th>
                        <th>number of rab establishment success for HS  </th>
                        <th>number of CS call drop  </th>


                </tr>
            </thead>

            <tbody>
</table>
</html>
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1 Answer

  1. Editorial Team

    As has been mentioned you’ll need to have a common column count to make UNION query. To remove the duplicates surround the UNION statement with a SELECT DISTINCT <columna columnb > statement.

    select distinct columna columnb from    
(   
    select subcol0a columna, subcol0b columnb, '', '' from table0    
        union
    select subcol1a columna, subcol1b columnb, '', '' from table1 
 )  as query0
where <some condition>

    Just alias the individual columns in the subquery so they match up when collected in the outer SELECT.

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