Re: What is the alternate of FILTER below Postgresql 9.4 ?

>
>
>>
>> I tried, but it is not giving the output exactly like *FILTER*.
>>
>> app_development=# select CASE WHEN lower(location) = 'x' THEN COUNT(id)
>> ELSE 0 END AS X_loc, CASE WHEN lower(location) != 'x' THEN COUNT(id) ELSE 0
>> END AS Non_X_loc from people group by lower(location);
>> x_loc | non_x_loc
>> -------+-----------
>> 0 | 1
>> 2 | 0
>> (2 rows)
>> app_development=# select count(CASE WHEN lower(location) = 'x' THEN 1
>> END) AS X_loc, count(CASE WHEN lower(location) != 'x' THEN 1 END) AS
>> Non_X_loc from people group by lower(location);
>> x_loc | non_x_loc
>> -------+-----------
>> 0 | 1
>> 2 | 0
>> (2 rows)
>>
>> It is 2 rows output.
>>
>>
> then don't include the group by (which forces 1 row per location)
>
> select sum(case WHEN lower(location) = 'x' THEN 1 else 0 end) AS x_loc,
> sum(case WHEN lower(location) != 'x' THEN 1 else 0 end) AS not_x_loc
> from people;
>
>
> Roxanne
>
>
Also, if performance is not a big concenr, you can define a little
function, which I find makes the queries easier to read:

CREATE OR REPLACE FUNCTION or_null( boolean ) RETURNS boolean AS $$

SELECT CASE WHEN $1 THEN TRUE ELSE NULL END;

$$ LANGUAGE sql IMMUTABLE;

select count(or_null(lower(location) = 'x')) AS x_loc,
count(or_null(lower(location) != 'x'))) AS not_x_loc
from people;

Cheers,
Ken

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