sql - MySQL union and order by help -

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The code below works, but when I order order order by Sdid, then I get the error < / p>

Choose unknown column 'order clause' in 's.id' 

  $ build = "child. subscribe name = child.parent INNER (s.productid = parent.id) select Join where s.username = '$ logged' and s.type = '0' child. .sid = child.sid subscribe INNER (s.productid = Parent.id) where s.username = '$ logged' and parent.keyword! = Child.name and s.type = '1' order s through Mr. Diissi ";   
 How do I change the code so that it can be ordered by s.id, which is the ID of the table?   
 
 
 is by MySQL Union tried to implement ORDER but union within  child < / Code> column (without  child ). Prefix on it), there is no  s.id  in the union but you can add one:  
  select the child. *, SID as SDID ... Selecting Union Hair * As SID SID ... SED ordered by Diissi   
 You'll need to give it a nickname because union table will erase the name or nickname prefix. If the  sid  column has  child , then use the other names for  s.id .

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