[shreyas@rails_app_test (master)]$ rails db psql (9.4.1) Type "help" for help.
app_development=# select id, location, name from people; id | location | name ----+----------+------ 2 | X | foo 3 | X | foo 4 | Y | foo (3 rows)
app_development=# SELECT COUNT(id) FILTER(WHERE lower(location) != 'x') AS Non_X_loc, COUNT(id) FILTER (WHERE lower(location) = 'x') AS X_loc FROM "people"; non_x_loc | x_loc -----------+------- 1 | 2 (1 row)
This *FILTER* method is available from 9.4, How can I get the same output below 9.4 version ?
use SQL CASE
SELECT COUNT(CASE lower(location) <> 'x' THEN 1 END), ...
attention: "lower" function is slow - so don't use it if it is not necessary
Regards
Pavel Stehule
-- ================ Regards, Arup Rakshit ================ Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.
