awk to print the fields based on condition: - awk

Question

I would like to compare first field and third filed of Input.csv file with Second and third fields of Master.csv.
And if the fruits name matches and the Amount of Master.csv is less than Amount of Input.csv then print all the lines from both the files.
For example,
Fruits==Apple,Amount <20 from Master.csv need to be checked with Input.csv, so the output would be
Fruits,Region,Amount,Details
Apple,North,10,Abc
Apple,south,9,Abc
Input.csv
Fruits,Region,Amount,Details
Apple,North,10,Abc
Orange,East,115,Def
Apple,south,9,Abc
Apple,West,25,Abc
Orange,West,150,Def
Orange,North,200,Def
Mango,North,50,Ghi
Mango,East,75,Ghi
Master.csv
Details,Fruits,Amount
xxx,Apple,20
yyy,Mango,60
zzz,Cherry,80
Desired Output.csv
Fruits,Region,Amount,Details,Details,Fruits,Amount
Apple,North,10,Abc,xxx,Apple,20
Apple,south,9,Abc,xxx,Apple,20
Mango,North,50,Ghi,yyy,Mango,60
I have tried like below command
awk -F "," 'FNR==NR {a[$1]; b[$3]; next} $2 in a && $3 < b' Input.csv Master.csv > Output.csv

Answer 1

Following awk may help you on same:
awk -F"," 'FNR==1 && FNR==NR{val=$0} FNR==NR{a[$2]=$3;b[$2]=$0;next} FNR==1 && FNR!=NR{for(i=NF;i>0;i--){val1=val1?$i OFS val1:$i};print val,val1} (($1 in a) && $3<a[$1]){print $0,b[$1]}' OFS=, master.csv input.csv
Adding a non-one liner form of solution now:
awk -F"," '
FNR==1 && FNR==NR{
val=$0
}
FNR==NR{
a[$2]=$3;
b[$2]=$0;
next
}
FNR==1 && FNR!=NR{
for(i=NF;i>0;i--){
val1=val1?$i OFS val1:$i};
print val,val1
}
(($1 in a) && $3<a[$1]){
print $0,b[$1]
}
' OFS=, master.csv input.csv
Output will be as follows:
Details,Fruits,Amount,Fruits,Region,Amount,Details
Apple,North,10,Abc,xxx,Apple,20
Apple,south,9,Abc,xxx,Apple,20
Mango,North,50,Ghi,yyy,Mango,60