> PS Note that it is count(X) and not count("X")
Count(X) and Count("X") are identical if X is a column in the table (or join)
from which you are counting, and X does not contain embeded spaces, special
characters, or other inanities. count(*) counts rows, and count('X') or
count(1) [or any other constant in place of 1] will also return the row count
(because you have provided a non-null value to be counted for each row).
In fact, count(expression) is exactly equivalent to sum(1) where expression is
not null, unless expression includes the keyword distinct.
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