Question

I’ve got table TClientsPayment with fields

idcontract,idclient,last_paid_time,paid,left_to_pay

and I need to insert data from this table to another table TClientsPaymentsHistory with fields

idcontract,idclient,last_paid_time,paid,late

where late is a bit field. late can be either 0 or 1. it depends on whether client has paid till 25.xx.xxxx. If not late = 1.

If I make a query

insert into TClientPaymentHistory
select idcontract,
       idclient,
       last_paid_time,
       paid
from TClientsPayments

then how to set late field in this insert query?

Answer 1

Use the CASE expression in the SELECT clause, here is a pseudo code of how you can do this:

insert into TClientPaymentHistory
select idcontract,
       idclient,
       last_paid_time,
       paid,
       CASE 
         WHEN DATEDIFF(day, last_paid_time, 'tell date here') <= something THEN 0
         ELSE 1
       END AS late     
from TClientsPayments

Since you didn’t specify what RDBMS you are using, you will need to determine the correct way to get the date difference depending on the SQL dialect you are using.