sql语句按某个字段分组

Question

hello all my database structure is like

 dsid - auto increment, did,coid,eid,dcid

now i want to select did,coid,eid and dcid but group them by eid like when i run the while loop i should get all the values for eid1 and then for eid2 and then eid3 right now i get values in dsid descending order

i am using this query

 $somevari=mysqli_query($link,"select did,coid,eid,dcid from table where
 did='$variable'order by dsid desc"); //here i want to group them by eid
 while($thedatavariable=mysqli_fetch_array($somevari)){
 echo $thedatavariable['eid'];
 echo $thedatavariable['dcid'];
 }

 // i want all the values of dcid for a perticular eid and then other eid then other eid

Answer 1

Do you just want the results in a particular order? If so:

order by (eid = $eid) desc, eid

where $eid is your particular eid.

EDIT:

In that case, you would seem to just want:

order by eid