MySQL dengan InnoDB:Bagaimana cara menghindari penggunaan COUNT?

Masukkan kondisi Anda ke dalam sum() . Seperti ini, Anda mendapatkan hitungan tunggal

SELECT SUM(sourceItem = 1 AND destinationItem = 1) AS count1,
       SUM(sourceItem = 1 AND destinationItem = 2) AS count2
FROM trades

Untuk mendapatkan hitungan bersyarat lengkap lakukan

SELECT SUM(case when sourceItem > 0 and destinationItem > 0 then 2
                when sourceItem > 0 or destinationItem > 0 then 1
                else 0 
           end) AS complete_sum
FROM trades

atau

SELECT SUM(sourceItem > 0) + sum(destinationItem > 0) AS complete_sum
FROM trades