Question

I have a table called “items”

id       month       year       **itemname**       distmoney
 1        12         2012         chicken           20
 2        12         2012         pork              15
 3        11         2012         chicken           21
 4        11         2012         pork              15

I am trying to run a “difference report” on items with the same name.

So for chicken, it is found in month 12 & 11. If distmoney is different for these two months, i want to echo a warning or something of that nature. In my example above, distmoney for chicken is 20 for month 12 but 21 for month 11. So, a “warning!” should be echoed. For pork, however, distmoney remains the same so I would just echo “no issues” or something of the sort.

How can I go about doing this?

Thanks for any help. It is much appreciated.

Answer 1

You can GROUP BY the rows on the itemname column and see how many distinct values are in distmoney column. If there are more than one distinct value, then there may be a problem.

SELECT 
    name,
    IF(COUNT(DISTINCT distmoney) > 1, 'warning!', 'no issues') AS status
FROM
    items
GROUP BY
    name