我需要帮助，以基于所有收录ID的Discharge_date和Admission_date计算天数。谢谢
ADMISSION_ID PATIENT_ID ADMISSION_ EXP ADMITTED_BY WAR DISCHARGE_
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205 101 02/02/2011 HB 114 P 16/02/2011
275 101 01/09/2010 HY 115 L 01/11/2010
286 101 03/05/2016 AR 116 A 03/07/2016
303 101 03/04/2018 LA 125 F 13/05/2018
298 103 23/01/2016 TS 114 L 24/04/2016
299 103 23/03/2016 AP 114 L 23/04/2016
305 103 23/04/2018 HT 125 F 29/05/2018
321 103 13/05/2018 AR 125 F 23/05/2018
283 105 03/12/2015 AR 116 A 05/12/2015
278 105 01/01/2011 HB 115 P 30/01/2011
307 105 03/04/2018 TS 125 F 13/05/2018