SQL error: misuse of aggregate

Question

SQLite version 3.4.0 What's wrong with aggregate functions? Additionally, I suspect that ORDER BY won't work as well. How to rewrite this?

sqlite> SELECT p1.domain_id, p2.domain_id, COUNT(p1.domain_id) AS d1, COUNT(p2.domain_id) AS d2    ...> FROM PDB as p1, Interacting_PDBs as i1, PDB as p2, Interacting_PDBs as i2    ...> WHERE p1.id = i1.PDB_first_id    ...> AND p2.id = i2.PDB_second_id    ...> AND i1.id = i2.id    ...> AND d1>100    ...> AND d2>100    ...> ORDER BY d1, d2; SQL error: misuse of aggregate:  sqlite> 

Answer 1

When using an aggregate function (sum / count / ... ), you also have to make use of the GROUP BY clause.

Next to that, when you want to filter on the result of an aggregate , you cannot do that in the WHERE clause, but you have to do that in the HAVING clause.

SELECT p1.domain_id, p2.domain_id, COUNT(p1.domain_id) AS d1, COUNT(p2.domain_id) AS d2     FROM PDB as p1, Interacting_PDBs as i1, PDB as p2, Interacting_PDBs as i2     WHERE p1.id = i1.PDB_first_id     AND p2.id = i2.PDB_second_id     AND i1.id = i2.id GROUP BY p1.domain_Id, p2.domain_Id HAVING d1 > 100 AND d2 > 100 ORDER BY d1, d2;