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Thanks. I never realized it behaved like that. Will correct queries.
http://stackoverflow.com/questions/2054235/why-doesnt-postgres-group-by-null-select-countshttp://www.postgresql.org/docs/9.0/static/functions-aggregate.htmlsays "number of input rows for which the value ofexpression is not null"On Fri, Oct 25, 2013 at 3:38 PM, James David Smith <james.david.smith@gmail.com> wrote:Hi everyone, Any thoughts on the below three queries please? james_traffic=# SELECT count(*) FROM stage; count -------- 430991 (1 row) james_traffic=# SELECT bad_flag, count(bad_flag) FROM stage GROUP BY bad_flag; bad_flag | count ----------+------- | 0 1 | 4102 (2 rows) james_traffic=# SELECT count(bad_flag) FROM stage; count ------- 4102 (1 row) I'm confused as to why the second query doesn't return this: bad_flag | count --------------+------- | 426889 1 | 4102 It should count the records surely, even if the field is blank/null ? Thanks James -- Sent via pgsql-novice mailing list (pgsql-novice@postgresql.org) To make changes to your subscription:http://www.postgresql.org/mailpref/pgsql-novice
Hi everyone, Any thoughts on the below three queries please? james_traffic=# SELECT count(*) FROM stage; count -------- 430991 (1 row) james_traffic=# SELECT bad_flag, count(bad_flag) FROM stage GROUP BY bad_flag; bad_flag | count ----------+------- | 0 1 | 4102 (2 rows) james_traffic=# SELECT count(bad_flag) FROM stage; count ------- 4102 (1 row) I'm confused as to why the second query doesn't return this: bad_flag | count --------------+------- | 426889 1 | 4102 It should count the records surely, even if the field is blank/null ? Thanks James -- Sent via pgsql-novice mailing list (pgsql-novice@postgresql.org) To make changes to your subscription:http://www.postgresql.org/mailpref/pgsql-novice
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