MySQL left join match based on distinct values

Question

I'm looking to join two tables based on dates. The date value in one of the tables can occur multiple times but I need a match based on a unique instance of the date. Here is what I have that does not work:

select idt.Incident_DateCopy, wt.weather_main
 from incidentdatatwo as idt left join weather as wt on 
     (select distinct(Incident_DateCopy) from incidentdata) as idate = wt.dt_iso

...

Answer 1

try this

if not work so please send you table schema

SELECT idt.Incident_DateCopy, wt.weather_main , 
(SELECT DISTINCT(Incident_DateCopy) FROM incidentdata) AS idate 
 FROM incidentdatatwo AS idt LEFT JOIN weather AS wt ON
HAVING idate = wt.dt_iso