SELECT base_currency_code, to_number(NULL) order_id FROM gl_plcy_mst a ,sy_orgn_mst b WHERE a.co_code=b.co_code UNION ALL SELECT billing_currency, order_id FROM op_ordr_hdr
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SELECT BASE_CURRENCY_CODE , TO_NUMBER(NULL) ORDER_ID FROM GL_PLCY_MST A , SY_ORGN_MST B WHERE A.CO_CODE=B.CO_CODE UNION ALL SELECT BILLING_CURRENCY , ORDER_ID FROM OP_ORDR_HDR