Steve Crawford wrote:
PostgreSQL Admin wrote:
I have a table ...
when I run this query:
select ndb_no, nutrient_no, nutrient_value from nutrient_data where
ndb_no = 13473;
it produces:
ndb_no | nutrient_no | nutrient_value
--------+-------------+----------------
13473 | 203 | 24.18
...
I want only certain nutrient_no (say 8 of them) and the nutrient
values by ndb_no.
Not entirely sure I understand the question. Do you mean that for a
given nutrient_no, you want the complete list of nutrient values? If
so, it's just:
--Example for nutrient_no 203:
SELECT ndb_no, nutrient_value from nutrient_data where nutrient_no=203;
Cheers,
Steve
I would like to have multiple values nutrient_no:
ndb_no | nutrient_no | nutrient_value
--------+-------------+----------------
13473 | 203 | 24.18
13473 | 204 | 15.93
13473 | 205 | 0
13473 | 207 | 1.1
13473 | 208 | 247
13473 | 221 | 0
I'm thinking:
select nutrient_no, nutrient_value from nutrient_data where ndb_no =
13473 and (nutrient_no = '203' or nutrient_no = '204' or nutrient_no = 208);
Now is that the most efficient SQL query?
Thanks,
J
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