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我有這個查詢,從多個表中拉出數據。如何使此查詢顯示所有行,即使它們具有NULLS日期?
SELECT ph.list_header_id
,phtl.name
,mtl.segment1
,mtl.description
,pl.list_price_uom_code
,pl.price_break_type_code
,pl.list_price
,ph.currency_code
,pl.start_date_active
,pl.end_date_active
FROM qp_list_headers_b ph
LEFT OUTER JOIN qp_list_headers_tl phtl ON phtl.list_header_id = ph.list_header_id
AND phtl.language = userenv('LANG')
LEFT OUTER JOIN qp_list_lines pl ON pl.list_header_id = ph.list_header_id
LEFT OUTER JOIN mtl_parameters mp ON mp.master_organization_id = mp.organization_id
LEFT OUTER JOIN mtl_system_items_b mtl ON mtl.inventory_item_id = pl.inventory_item_id
AND mtl.organization_id = mp.organization_id
WHERE ph.list_header_id BETWEEN :p_header_id_start AND :p_header_id_end
AND pl.start_date_active BETWEEN :p_start_date AND :p_end_date
的問題是,如果有在日期爲空,它不拉該行(與同爲也爲其他列時,他們空)
我該如何解決這個問題問題?非常感謝