सभी सह लेखक खोजें - अनेक से अनेक मानचित्रण तालिका के लिए फ़ेसटिंग/ग्रुपिंग

इसे आजमाएं:

SELECT "AuthorId", COUNT(*)
FROM BookAuthorMapping
WHERE "BookId" IN (SELECT "BookId" FROM BookAuthorMapping WHERE "AuthorId" = 1)
GROUP BY "AuthorId"

यहां डेमो करें

आप वैकल्पिक रूप से INNER JOIN . का उपयोग कर सकते हैं :

SELECT t1."AuthorId", COUNT(*)
FROM BookAuthorMapping AS t1
INNER JOIN BookAuthorMapping AS t2 ON t1."BookId" = t2."BookId" AND t2."AuthorId" = 1
GROUP BY t1."AuthorId"

यहां डेमो करें