mysql - SQL query: Separate column where IDs are the same but type is different -


basically simple select query:

select  site.refid, sitename, dates.date, dates.type site, dates site.refid = dates.refid;   refid | sitename | date        | type 1       sydney       06-12-15   opened 1       sydney       08-12-15   closed 2       mel          17-12-15   opened 2       mel          19-12-15   closed

but want seperate tge result similar this:

refid | sitename | dateopened     | dateclosed 1       sydney       06-12-15     | 08-12-15

basically want compare data tracking details

apologies in advance if question isn't structured :/ i'm complete beginner

i thinking maybe select within select or possible case when's, can't seem either working

try following approach, using case expression:

select s.refid      , s.name      , min(case when d.type == 'opened' d.date end) dateopened      , min(case when d.type == 'closed' d.date end) dateclosed site s  join dates d on s.refid = d.refid group s.refid, s.name

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