如何在datawindow中定義變量， SELECT jkda_jb_grjbxx.jkdaid, jkda_jb_grjbxx.xm, COUNT(DISTINCT bh) AS Expr1 FROM jkda_jb_grjbxx, jkda_gxy_brjbxx WHERE ( jkda_jb_grjbxx.jkdaid = jkda_gxy_ ) and (zd_gxy = '1') AND (sfrq>：aaa) AND (sfrq < :bbb) GROUP BY jkda_jb_grjbxx.jkdaid, jkda_jb_grjbxx.xm 還要從哪聲名嗎？