Sorting information in Google Sheets - google-sheets

Question

I have some information in Google Sheets in the following format:
Authors
Number
Akwaeke Emezi
2
Ezra Claytan Daniels, Ben Passmore
3
Nick Tapalansky, Kate Glasheen
9
John Allison, Lissa Treiman, Whitney Cogar
1
John Allison, Lissa Treiman, Max Sarin, Whitney Cogar
2
Gene Luen Yang, Sonny Liew
43
Gene Luen Yang
9
I would like to have a second sheet that does the following:
Generate a list of each individual author in "Authors" (ideally in alphabetical order by last name)
Calculate the average Number associated with each author (e.g. Akwaeke Emezi would be 2 and Gene Luen Yang would be (43+9)/2)
I can do this as a one-off calculation, but what I'm really looking for is a way to set this up such that when I add more entries to the spreadsheet (where the new entries will contain a combination of new authors and authors that already appear in the list), this second sheet will automatically update the list of individual authors and their associated average numbers.

Answer 1

try:
=ARRAYFORMULA(QUERY(QUERY(SPLIT(FLATTEN(REGEXEXTRACT(
SPLIT(A2:A, ","), " (.*)$")&"×"&TRIM(SPLIT(A2:A, ","))&"×"&B2:B), "×"),
"select Col1,Col2,sum(Col3)/count(Col2) where Col3>0 group by Col1,Col2"),
"select Col2,Col3 offset 1", 0))
or:
=ARRAYFORMULA(QUERY(QUERY(SPLIT(FLATTEN(REGEXEXTRACT(
SPLIT(A2:A, ","), " (\w+)$")&"×"&TRIM(SPLIT(A2:A, ","))&"×"&B2:B), "×"),
"select Col1,Col2,sum(Col3)/count(Col2) where Col3>0 group by Col1,Col2"),
"select Col2,Col3 offset 1", 0))
update:
=ARRAYFORMULA(QUERY(QUERY(SPLIT(FLATTEN(REGEXEXTRACT(
TRIM(SPLIT(REGEXREPLACE(A2:A,
"\b(?:X)?(?:X)?(?:X)?(?:V)?(?:I)?(?:I)?(?:I)?(?:V)?(?:X)?(?:X)?(?:X)?\b", ), ",")),
" (\w+)$")&"×"&TRIM(SPLIT(A2:A, ","))&"×"&B2:B), "×"),
"select Col1,Col2,sum(Col3)/count(Col2) where Col3>0 group by Col1,Col2"),
"select Col2,Col3 offset 1", 0))