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CASE ca_name WHEN '공지1' THEN 1 WHEN '공지2' THEN 2 WHEN '공지3' THEN 3 ELSE 4 END, cl_order asc

 

order by FIELD(ca_name, '공지1', '공지2') desc, wr_20 is null asc, wr_20 desc, wr_datetime desc