sql - Unsure why this query is inserting duplicate records -

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i have table customers has pk customerid , 2 date fields transdate , updateddate.

i have table paymentplan has 3 date fields: startdate, enddate , updateddate.

i need find customer records meet following criteria , insert them table.

  • transdate not null , falls between 1 paymentplan record's startdate , enddate.

  • transdate null , updatedon falls between 1 paymentplan record's startdate , enddate.

  • regardless of whether or not transdate null, updatedon value of customers must older updatedon of paymentplan.

the problem i'm having query returning duplicate customerid values.

this procedure:

create procedure usp_find_customers_for_recalc     @adaysback int begin     set nocount on;     set @adaysback = @adaysback * -1; -- since we're looking "back" in time, want negative value of number passed procedure      insert recalc (customerid, insertedon, recordstatus, processedon)     select customerid, getdate() insertedon, 0 recordstatus, null processedon     customers     inner join      (select p.code, p.startdate, p.enddate, p.updatedon         paymentplan p          p.updatedon >= dateadd(day, @adaysback, getdate()) , deletedon null         group p.code, p.startdate, p.enddate, p.updatedon) pinfo on customers.code = pinfo.code            (isnull(customers.transdate, customers.updatedon) >= pinfo.startdate , isnull(customers.transdate, customers.updatedon) <= pinfo.enddate , customers.updatedon < pinfo.updatedon)         , customers.deletedon null  end

if run above procedure, run following commands:

select count(distinct(customerid)) recalc select count(customerid)) recalc

the second result approximately twice big first result.

i cannot determine wrong query resulting in many duplicate customers being added when not need recalculated.

the duplicates caused data in paymentplan table. although intention periods defined in table non-overlapping given code, not case, , explain duplicates.

to identify if indeed have such overlapping periods in paymentplan table, issue statement:

select     p1.code, p1.startdate       paymentplan p1 inner join paymentplan p2         on p1.code = p2.code        , p1.startdate between p2.startdate , p2.enddate

if query returns records, explains duplicates. returned records give clue such inconsistencies in paymentplan table.

once have resolved those, no longer produce duplicates.


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