inner join 有兩行結果同樣的狀況

sql：SELECT a.gift_id AS gift_id,a.promotion_id AS promotion_id,p.promotion_base AS promotion_base,p.start_date AS start_date,p.end_date AS end_date,p.promotion_name AS promotion_name,p.promotion_type AS promotion_type,p.select_product AS select_product,p.shop_id AS shop_id,p.parent_combo_product_id AS parent_combo_product_id,p.theme_pic AS theme_pic,p.template_url AS template_url,p.template AS template,p.display_index AS display_index,p.subject_bg AS subject_bg,p.soldcount AS soldcount,p.catid AS catid,p.product_num AS product_num,p.guan_id AS guan_id,p.shop_main_catid AS shop_main_catid,p.shop_promotion_code AS shop_promotion_code,p.cost_center AS cost_center,p.orderflow_after_no_stock AS orderflow_after_no_stock,p.tag_page AS tag_page,p.enabled_tag AS enabled_tag,p.limit_buy_num AS limit_buy_num,p.is_enabled_coupon AS is_enabled_coupon,p.is_enabled_coupon_promo AS is_enabled_coupon_promo,p.v_attach_type AS v_attach_type FROM (SELECT promotion_id,gift_id FROM promo_gift_list WHERE gift_id IN(400000021) AND is_valid=1 AND IFNULL(is_delete,0)!=1) a INNER JOIN promo_prod_setting p ON a.promotion_id = p.promotion_id AND start_date<Now() AND end_date>NOW() AND review_status=4 AND promotion_type='3'\G 結果：*************************** 1. row *************************** gift_id: 400000021 promotion_id: 741026 promotion_base: 15-3-1 start_date: 2013-03-08 16:59:13 end_date: 2013-12-31 10:00:00 promotion_name: 15-pro3 promotion_type: 3 select_product: 58 shop_id: 3916 parent_combo_product_id: NULL theme_pic: NULL template_url: NULL template: 1 display_index: 0 subject_bg: 0 soldcount: 0 catid: NULL product_num: 0 guan_id: 0 shop_main_catid: NULL shop_promotion_code: NULL cost_center: NULL orderflow_after_no_stock: NULL tag_page: NULL enabled_tag: NULL limit_buy_num: NULL is_enabled_coupon: NULL is_enabled_coupon_promo: NULL v_attach_type: NULL *************************** 2. row *************************** gift_id: 400000021 promotion_id: 741032 promotion_base: 152-3-2 start_date: 2013-03-08 16:59:13 end_date: 2013-12-31 10:00:00 promotion_name: 152-3-2 promotion_type: 3 select_product: 58 shop_id: 3916 parent_combo_product_id: NULL theme_pic: NULL template_url: NULL template: 1 display_index: 0 subject_bg: 0 soldcount: 0 catid: NULL product_num: 0 guan_id: 0 shop_main_catid: NULL shop_promotion_code: NULL cost_center: NULL orderflow_after_no_stock: NULL tag_page: NULL enabled_tag: NULL limit_buy_num: NULL is_enabled_coupon: NULL is_enabled_coupon_promo: NULL v_attach_type: NULL *************************** 3. row *************************** gift_id: 400000021 promotion_id: 34567892 promotion_base: product start_date: 2013-07-18 13:07:54 end_date: 2021-07-25 13:07:57 promotion_name: 商家168買A贈B_wangyu promotion_type: 3 select_product: NULL shop_id: 168 parent_combo_product_id: NULL theme_pic: NULL template_url: NULL template: 1 display_index: 0 subject_bg: 0 soldcount: 0 catid: NULL product_num: 0 guan_id: 0 shop_main_catid: NULL shop_promotion_code: NULL cost_center: NULL orderflow_after_no_stock: NULL tag_page: NULL enabled_tag: NULL limit_buy_num: NULL is_enabled_coupon: NULL is_enabled_coupon_promo: NULL v_attach_type: NULL *************************** 4. row *************************** gift_id: 400000021 promotion_id: 741032 promotion_base: 152-3-2 start_date: 2013-03-08 16:59:13 end_date: 2013-12-31 10:00:00 promotion_name: 152-3-2 promotion_type: 3 select_product: 58 shop_id: 3916 parent_combo_product_id: NULL theme_pic: NULL template_url: NULL template: 1 display_index: 0 subject_bg: 0 soldcount: 0 catid: NULL product_num: 0 guan_id: 0 shop_main_catid: NULL shop_promotion_code: NULL cost_center: NULL orderflow_after_no_stock: NULL tag_page: NULL enabled_tag: NULL limit_buy_num: NULL is_enabled_coupon: NULL is_enabled_coupon_promo: NULL v_attach_type: NULL *************************** 5. row *************************** gift_id: 400000021 promotion_id: 741026 promotion_base: 15-3-1 start_date: 2013-03-08 16:59:13 end_date: 2013-12-31 10:00:00 promotion_name: 15-pro3 promotion_type: 3 select_product: 58 shop_id: 3916 parent_combo_product_id: NULL theme_pic: NULL template_url: NULL template: 1 display_index: 0 subject_bg: 0 soldcount: 0 catid: NULL product_num: 0 guan_id: 0 shop_main_catid: NULL shop_promotion_code: NULL cost_center: NULL orderflow_after_no_stock: NULL tag_page: NULL enabled_tag: NULL limit_buy_num: NULL is_enabled_coupon: NULL is_enabled_coupon_promo: NULL v_attach_type: NULL

緣由：SELECT promotion_id,gift_id FROM promo_gift_list WHERE gift_id IN(400000021) AND is_valid=1 AND IFNULL(is_delete,0)!=1 \G; *************************** 1. row *************************** promotion_id: 741026 gift_id: 400000021 *************************** 2. row *************************** promotion_id: 741032 gift_id: 400000021 *************************** 3. row *************************** promotion_id: 747003 gift_id: 400000021 *************************** 4. row *************************** promotion_id: 741015 gift_id: 400000021 *************************** 5. row *************************** promotion_id: 747015 gift_id: 400000021 *************************** 6. row *************************** promotion_id: 2012168816 gift_id: 400000021 *************************** 7. row *************************** promotion_id: 747005 gift_id: 400000021 *************************** 8. row *************************** promotion_id: 747006 gift_id: 400000021 *************************** 9. row *************************** promotion_id: 747007 gift_id: 400000021 *************************** 10. row *************************** promotion_id: 747008 gift_id: 400000021 *************************** 11. row *************************** promotion_id: 747009 gift_id: 400000021 *************************** 12. row *************************** promotion_id: 747010 gift_id: 400000021 *************************** 13. row *************************** promotion_id: 747011 gift_id: 400000021 *************************** 14. row *************************** promotion_id: 747012 gift_id: 400000021 *************************** 15. row *************************** promotion_id: 747013 gift_id: 400000021 *************************** 16. row *************************** promotion_id: 34567892 gift_id: 400000021 *************************** 17. row *************************** promotion_id: 741032 gift_id: 400000021 *************************** 18. row *************************** promotion_id: 741026 gift_id: 400000021 18 rows in set (1.61 sec)

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promo_gift_list有重複數據