Comment ratio

(
SUM(CASE WHEN fb comments (Table 2) IS NULL THEN 0 ELSE fb comments (Table 2) END)
+ SUM(CASE WHEN insta comments (Table 4) IS NULL THEN 0 ELSE insta comments (Table 4) END)
+ SUM(CASE WHEN tw comments IS NULL THEN 0 ELSE tw comments END)
+ SUM(CASE WHEN LI Comments IS NULL THEN 0 ELSE LI Comments END)
)


/
(
SUM(CASE WHEN fb LS IS NULL THEN 0 ELSE fb LS END)
+ SUM(CASE WHEN insta LS IS NULL THEN 0 ELSE insta LS END)
+ SUM(CASE WHEN tw ls IS NULL THEN 0 ELSE tw ls END)
+ SUM(CASE WHEN LI LS IS NULL THEN 0 ELSE LI LS END)

)