php and mysql query


I am trying to write a query that will extract some 2 separate data from two tables, multiply them together , store it in another table and diplay it. This is the basic structure of my tables.

1. I have a table called REPMAX which contains
- weight
- exerciseid
- memberid
(so each member has a repmax weight for each exercise)

2. I have a table called WORKOUT which has
(basically this table contains the chart for what a member would be doing each day. the chart looks like this

level      phase       day     percentage      sets        reps
  1            1            1            50%            1           10
  1            1            2            45%            1            8
  1            1            3            45%            1            8

3.  I have the table called HISTORY which will basically have sessionnumber, date, the level, phase, day, weight (the repmax multiplied by the percentage from the day), the reps and the sets.

So, that we can get the right percentage from the right day, i want a way to detect which day the member is currently on, query the percentage from that day multiply it by the repmax and store it in the WORKOUT table along with the sets and reps from that day and display it to the user. So when the user clicks a button with says "show me my workout for today" all this will take place behind the scenes and it will show them data from the workout table. And then maybe if they logout, that data for the day is then stored in the HISTORY table with a date,  and sessionnumber(auto increment).  I hope this makes sense. if you think this is not a good design, I am open to any suggestions which will simplify this. Thanks

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PatrickAdrichemConnect With a Mentor Commented:
The query btw is

SELECT SUM(fielda * fieldb) FROM tablea INNER JOIN tableb ON tablea.fieldname = tableb.fieldname
i'm confused as to why you'd store something in the history table without the user saying "i did this" - it sounds like you may be storing when they said "i looked at this" - overall i'm a little vague on the design still as well.
aannanAuthor Commented:
basically, when u display that they are supposed to be doing for the day, there will be check boxes so after they are finished and they log out this will be stored in the history table. I was using the history table so that I can track what day the user is on to pick the right percentages.

As I mentioned earlier I am open to suggestions on the design. Thanks
I'm kind of confused on this one too.

Basicly i'd store more memberinfo in the member table.

This way based on the starting day you can add a day each time.
Because i don't get where you get your excersice id from @ all tbh.
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