Question

I have data imported from an excel sheet into a table in db.
Now the data provided in excel sheet consists of multiple records having all except one column value different.
I need to delete one of the two.

Below is my sample data…
I need to delete the one with null in “variant” column

INDEX_NUM  ||  variant   || CASE_PACK   ||cases || units        
1020                         144               0       0        
1020           null          144               1       116     ------- >    TO DELETE 
1020            xyz          144               1       116      

Data is the excel sheet itself is incorrect…It has multiple rows for same data just difference in variant.
I have got the data in my db.
Now i wan delete that row amongst the two havin variant as null
I cant use HAVING COUNT(VARIANT) >1 as there are other rows which are currect, but which also have multiple variants.

So i need to ignore variants beginning with DP and BD.

I hope this is clear…

Answer 1

You can try

DELETE FROM your_table
WHERE variant IS NULL
  AND index_num IN
    (SELECT DISTINCT index_num FROM your_table
     GROUP BY index_num, case_pack, cases, units
     HAVING COUNT(variant) > 1) p