Postgresql：真のOR句の数でランクを計算します

条件を繰り返して追加します：

SELECT * FROM mytable 
WHERE fld = 'A' OR fldB = CURRENT_DATE OR fldC = 7
ORDER BY
   (fld = 'A')::int + (fldB = CURRENT_DATE)::int + (fldC = 7)::int  
DESC