Double Lookup in Numbers 3

Question

Hi this one has had me stumped for a while so I hope there's the expertise out there!
I have two tables in different sheets; Lesson Sheet::Lesson Log Table and Pupil Summary Sheet::Pupil Progress Table.
I need to populate the summary sheet using the data from the Lesson Log Table, as per the image.
When a user selects a pupil, the Pupil Progress Table should update for the selected Pupil.
The formulas I need are for the cells circled blue and red. Any ideas?

Answer 1

Often when you end up with complicated formulas, index columns, and intermediate calculation tables, that's a sign maybe there's an easier way to do things (perhaps just filter the original data table, and live with the fact that the format is not as nice?). But here is one way that seems to do what you describe:
The index columns, which are later used by the INDEX MATCH lookup combination, are concatenation:
The formula in F2, copied down and right: =IF(LEN(C2)>0,C$1&$A2&C2&$B2,"")
The Calculations table:
C2, copied right: =IFERROR(INDEX(Lesson Log Table::$B,MATCH($A2&$A$1&C$1,Lesson Log Table::$F,-)),")
C3, copied right: =IFERROR(INDEX(Lesson Log Table::$B,MATCH($A3&$A$1&C$1,Lesson Log Table::$G,-)),")
C4, copied right: =IF(AND(Calculations::C4>Calculations::B4,Calculations::C4≠"Lesson Date"),Calculations::C4,"")
The Summary table:
C2 copied right and down: =IF(AND(Calculations::C2>Calculations::B2,Calculations::C2≠"Lesson Date"),Calculations::C2,"")
SG