Use the column checkboxes to build your query. Header columns sets/unsets all columns
SELECT MT_ID, OBJECTNAME, OBJECTTYPE, CLIDEP, LANGDEP, ALEDEP, OBJCATEG, TRCOMPLETE, TRDISJUNCT, PHASELEVEL, LOCKMETH, TADIRCMETH, CHECKID, OBJNAMELEN, PROTECT, OBJTRANSP, LUSER, LDATE, OBJNAMECLS, CURSETTING, OBJHASADDR, IMPORTABLE, OBJCHARSET, MCCATEGORY, MCDOCUID, NEW_CONT FROM MDS_OBJH