sql - Table design for payments -


i have table holds data person on project. table has start date field nullable end date field. so, person on project start end.

at moment, billable project. have new requirement that, period, can non-billable, yet, still working on project. so, have been assigned project, , working, reason, client isn't billed part of period assigned, or maybe billed @ lower rate.

my idea have exclusion type table, linked person assignment table have start date, , end date, , rate column, set 0 no-charge, or else, works override value period.

does seem valid design? person billed 95% of time, , never had exclusion, makes more sense me have exclusion table.

if has idea of how better, great.

at moment, have 'calendar' table, join based on start/end date of person's schedule daily rate. so, join exclusion date well, see if there override of rate?

issues might find design, lot of joins based on:

 on datevalue between start , end

and not sure they're efficient joins.

if exception 1 or more period of times (one-to-many) 1 project design using exclusion table best design.

example:

june 1, 2013 june 30, 2013

exclusion:

june 9, 2013 - 0 rate june 25 27 - 30% of original rate

however, if exclusion possible , can maximum of 1 single period (or one-to-one type of relationship) might instead put on same fields other fields on project table.

example:

june 1, 2013 june 30, 2013

exclusion:

june 9, 2013 - 0 rate

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