DB2在函数中同时对多个变量赋值（例子）

CREATE FUNCTION GDZJ.GETREPORTIDBYBZKEY
 (BZKEY INTEGER
 ) 
  RETURNS VARCHAR(21)
  LANGUAGE SQL
  NOT DETERMINISTIC
  READS SQL DATA
  STATIC DISPATCH
  CALLED ON NULL INPUT
  EXTERNAL ACTION
  INHERIT SPECIAL REGISTERS
  begin atomic
    declare sResult VARCHAR(21) default '';
    declare mtId integer default 0;
    declare spMtId integer default 0;
    set (mtId,spMtId)=(select COALESCE(MT_ID,0),COALESCE(SP_MT_ID,0) from T_BZ_BZBHGCPCL_INFO where AUTO_ID=BZKEY);
    set sResult=char(mtId)||'+'||char(spMtId);
    return sResult;
  end;