SQL: Find duplicate by date


I have a PostGreSQL/PostGIS database
Something like this

ID, Group_ code , point_number, date, geom
1, 1234, 1 , 2018-05-10, geom
2, 1234, 2 , 2018-05-10, geom
3, 1234, 3 , 2018-05-10, geom
4, 1234, 4 , 2018-05-10, geom
5, 1234, 5 , 2018-05-10, geom
6, 1235, 1 , 2017-05-10, geom
7, 1235, 2 , 2017-05-10, geom
8, 1235, 3 , 2017-05-10, geom
9, 1235, 4 , 2017-05-10, geom
10, 1234, 1 , 2017-05-10, geom  // WRONG

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I can have multiple Group_ code  the same but the should have the same date

I need to find all rows where the same Group_ code has 2 or more dates
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SujithData ArchitectCommented:
select group_code
from <table>
group by group_code
having count(distinct date) > 1

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HuaMin ChenProblem resolverCommented:
One other note is, to please avoid using "date" as the column, as it is reserved word in other databases, like Oracle and SQL SERVER.
trevor1940Author Commented:
Thanx your query worked

BTW actual date column called date_time
SujithData ArchitectCommented:
You are welcome
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