請問下面這個sql語句的篩選條件是什麼意思啊(在sybase上運行)
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SELECT a.*,b.prod_des
FROM q_mail_list a,production_center_tbl b
WHERE a.user_group *= b.prod_ctr //*是什麼意思?
ORDER BY user_group;
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SELECT a.*,b.prod_des
FROM q_mail_list a,production_center_tbl b
WHERE a.user_group *= b.prod_ctr //*是什麼意思?
ORDER BY user_group;
b 是 表 production_center_tbl 的别名