Create custom aggregate function and custom sfunc - Mailing list pgsql-sql

 hi,

 

i have to create a aggregate function which evaluates a maximum text value but with some conditions i have to take care of.

is there a way to access a value set of each group?

e.g.:

 

customer ; seg

111 ; L1

111 ; L2

111 ; L1

222 ; L3

222 ; L3

222 ; L2

 

the result should look like this:

 

111: L1 - because L1 is higher than L2 and ratio of L1 : L2 is 2 : 1

222: L3 - because L3 is higher than L2 and ratio of L3 : L2 is 2 : 1

 

i hope you know what i mean.

 

ty