我可以在同一个 SQL 查询中使用 LOWER 和 MIN 吗？

Question

I am getting an issue with my query written, am I able to use a LOWER and a MIN In the same query?

SELECT DISTINCT
    LOWER(id_5) AS "ID"
    ,MIN(visittime) AS "First Date"
FROM table
WHERE (date >= '2022-11-21')
    AND (
        server = 'pets.com' AND page = 'pets:dogs:puppy')

Answer 1

MIN is aggregation function which can be used only with aggregation or as window function or scenarios reducible to this like in queries when only one row is expected:

select max(LOWER(id_5)) AS "ID" -- or any other aggregation  function
   , min(Status) AS "First Date"
from dataset;

which is equivalent to group by true .

Note that DISTINCT works on all values in the select. If you want to find first visit per unique id_5 then just use group by :

SELECT LOWER(id_5) AS "ID"
    , MIN(visittime) AS "First Date"
FROM table
WHERE (date >= '2022-11-21')
    AND (
        server = 'pets.com' AND page = 'pets:dogs:puppy')
group by LOWER(id_5)