我有一个数据集，如下图所示，我想用y轴表示住院总人数，x轴代表时间或日期，请问大家这个命令该如何写？或者仅给我一个提示就行，谢谢。
| PATIENT_ID | VISIT_ID | DEPT_ADMISSION_TO | ADMISSION_DATE_TIME | DEPT_DISCHARGE_FROM | DISCHARGE_DATE_TIME |
| 80758817 | 1 | 311101 | 2010/4/13 | 311101 | 2010/6/1 |
| 6019452 | 2 | 221101 | 2008/1/7 | 221101 | 2012/10/18 |
| 10106275 | 3 | 210402 | 2008/2/18 | 210401 | 2011/10/24 |
| 80506970 | 4 | 221101 | 2009/1/21 | 221101 | 2010/7/13 |
| 80799651 | 1 | 221001 | 2009/7/28 | 221001 | 2010/9/30 |
| 81030877 | 3 | 220103 | 2009/7/28 | 220102 | 2010/6/28 |
| 012020 | 3 | 2215 | 2009/7/30 | 220102 | 2010/8/16 |
| 80876846 | 3 | 221101 | 2010/3/9 | 221101 | 2010/6/13 |
| 10110180 | 6 | 211002 | 2010/3/9 | 211002 | 2010/6/11 |
| 6006630 | 1 | 220902 | 2010/3/10 | 220902 | 2010/12/31 |
| 6025461 | 2 | 211002 | 2010/3/9 | 210201 | 2010/6/17 |
| 81099669 | 1 | 210201 | 2010/3/17 | 210201 | 2010/8/24 |
| 81095842 | 1 | 220102 | 2010/2/21 | 220102 | 2010/7/10 |
| 81121944 | 7 | 220901 | 2010/3/8 | 220901 | 2010/6/7 |
| 81094873 | 1 | 210702 | 2010/2/10 | 210702 | 2012/2/9 |
| 81111292 | 1 | 221101 | 2009/8/29 | 221101 | 2010/7/16 |
| 6028895 | 2 | 2215 | 2010/3/5 | 211001 | 2010/11/1 |
| 80468422 | 6 | 210402 | 2010/3/24 | 210402 | 2010/7/8 |
| 1066404 | 17 | 211601 | 2009/8/31 | 211601 | 2010/7/13 |
| 1083122 | 5 | 220201 | 2009/9/2 | 211201 | 2010/7/21 |
| 6042279 | 5 | 221101 | 2009/12/17 | 221101 | 2010/12/31 |
| 80975593 | 5 | 211301 | 2010/4/2 | 211301 | 2010/6/3 |
| 80595943 | 5 | 211701 | 2009/12/11 | 211701 | 2010/6/22 |
| 1050765 | 36 | 210401 | 2009/10/30 | 210401 | 2010/10/22 |
| 6028839 | 2 | 211001 | 2010/1/23 | 211001 | 2010/9/28 |
| 2003258 | 3 | 211001 | 2010/2/19 | 211001 | 2010/6/3 |
| 81082694 | 1 | 211701 | 2010/3/6 | 220201 | 2010/6/1 |
| 6027513 | 2 | 221101 | 2009/4/29 | 221101 | 2010/10/9 |
| 81083264 | 1 | 220901 | 2010/3/24 | 220901 | 2010/9/23 |
| 80959163 | 1 | 220201 | 2010/4/2 | 210201 | 2010/6/1 |
| 81086486 | 1 | 210901 | 2010/4/7 | 210902 | 2010/6/11 |
| 10107748 | 13 | 210402 | 2010/2/21 | 210403 | 2010/8/30 |
| 80701348 | 11 | 210901 | 2010/4/7 | 210901 | 2010/7/2 |
| 80656330 | 9 | 210901 | 2010/4/7 | 210901 | 2010/6/13 |
| 70013430 | 2 | 211301 | 2010/3/27 | 211301 | 2010/6/4 |
| 1014795 | 9 | 211002 | 2010/3/31 | 211002 | 2010/10/27 |
| 81086356 | 1 | 220902 | 2010/4/4 | 220902 | 2010/5/31 |
| 6029288 | 1 | 211701 | 2010/4/7 | 211001 | 2010/6/12 |
| 81086214 | 1 | 210301 | 2010/4/3 | 210301 | 2010/6/9 |
| 80959262 | 1 | 220201 | 2010/4/6 | 210201 | 2010/7/15 |
| 80959972 | 1 | 210201 | 2010/4/6 | 210201 | 2010/6/29 |
| 1088394 | 11 | 221101 | 2010/2/9 | 221101 | 2010/6/13 |
| 80634735 | 4 | 221101 | 2010/1/20 | 221101 | 2010/8/12 |
| 80992532 | 2 | 210902 | 2010/3/18 | 210902 | 2010/6/12 |
| 81086923 | 1 | 211004 | 2010/4/7 | 220102 | 2010/9/10 |
| 80985669 | 6 | 220902 | 2010/4/26 | 220902 | 2010/6/25 |
| 80264041 | 3 | 210201 | 2010/8/24 | 210201 | 2010/8/30 |
| 70058551 | 1 | 221201 | 2010/8/24 | 221201 | 2010/8/30 |
| 1076735 | 5 | 220901 | 2010/8/24 | 211001 | 2010/10/13 |
| 81134038 | 6 | 210201 | 2010/8/24 | 210201 | 2010/8/30 |
| 81090061 | 1 | 221201 | 2010/8/24 | 221201 | 2010/8/29 |
| 80253634 | 2 | 210103 | 2010/8/24 | 210103 | 2010/9/9 |
| 80853710 | 2 | 210103 | 2010/8/24 | 210103 | 2010/10/1 |
| 80741363 | 1 | 221201 | 2010/8/24 | 221201 | 2010/8/30 |
| 81096882 | 2 | 221201 | 2010/8/24 | 221201 | 2010/8/29 |
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