mysql - 按特定列对数据库数据进行分组

Question

我有一个数据库，我有一些记录。我想显示按 ordNR 分组的所有记录，我该怎么做？

SELECT Group_concat(ordnr) ordNR, 
       koden, 
       Group_concat(wish)  wish, 
       rnamn, 
       bild, 
       pris, 
       cname, 
       onsktext, 
       restidn 
FROM   (SELECT m.ordnr    AS ordNR, 
               p.id       AS restidn, 
               t.tabnum   AS tabNum, 
               m.wishtext AS onsktext, 
               m.meaoid   AS midn, 
               m.ordcode  AS koden, 
               w.wish, 
               r.meaname  AS rnamn, 
               r.meaimg   AS bild, 
               r.meaprice AS pris, 
               k.catname  AS cname 
        FROM   cats k, 
               meals r, 
               tables t, 
               restaurant p, 
               wishes w, 
               meaorder m 
               JOIN orders c 
                 ON c.ordnr 
        WHERE  p.id = '3' 
               AND c.tabid = t.tabid 
               AND c.ordstatus = '0' 
               AND m.ordnr = c.ordnr 
               AND m.meaid = r.meaid 
               AND m.wishesid = w.id 
               AND r.catid = k.catid)T 
GROUP  BY koden, 
          rnamn, 
          bild, 
          pris, 
          cname 
ORDER  BY midn DESC 

Answer 1

先按ordNR，再按midn。