如何从选择的法规中选择数据

本文介绍了如何从选择的法规中选择数据的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

select dw.C_DSC_Code,MAX(dr.d_date_report) from TBL_DWR_DETAILS dw left join tbl_dwr dr on dr.N_Srno=dw.N_Srno where dw.C_DSC_Code in ( 'D34848', 'D34796','D34799','D34801', 'D34712','D34772','D34784','D34785', 'D34787','D34816','D34765','D34779', 'D34770','D34755','D34782','D34822', 'D34687','D34817','D34759','D34777', 'D34750','D34778','D044633','D34746', 'D34749','D34819','D34747','D34769', 'D34781','D34748','D34824','D34834', 'D34776','D34670','D34763','D34757', 'D34827','D34756','D34760','D34690', 'D34739','D34716','D34768','D34825', 'D34766','D34741','D34713') group by dw.C_DSC_Code

在这个qvery我希望看到括号内的所有47位医生..但它只从tbl_dwr_details表中获取匹配值，即只有44条记录，但我需要不匹配的记录3doctors ..如何让thar请帮助我

In this qvery i want to see all 47 doctors inside the bracket..but it fetches only matching values from tbl_dwr_details table i.e only 44 records but i need unmatching record of 3doctors..how to make thar pls help me out

推荐答案

只需添加 或dw。 C_DSC_Code为空 代码列表的结束括号后 just add or dw.C_DSC_Code is null after the closing bracket of the list of codes

如下所示，如果有效，请告诉我。 Try like below and let me know if this works. select dw.C_DSC_Code,MAX(dr.d_date_report) from tbl_dwr dr left join TBL_DWR_DETAILS dw on dr.N_Srno=dw.N_Srno AND dw.C_DSC_Code in ( 'D34848', 'D34796','D34799','D34801', 'D34712','D34772','D34784','D34785', 'D34787','D34816','D34765','D34779', 'D34770','D34755','D34782','D34822', 'D34687','D34817','D34759','D34777', 'D34750','D34778','D044633','D34746', 'D34749','D34819','D34747','D34769', 'D34781','D34748','D34824','D34834', 'D34776','D34670','D34763','D34757', 'D34827','D34756','D34760','D34690', 'D34739','D34716','D34768','D34825', 'D34766','D34741','D34713') group by dw.C_DSC_Code

你好， 我认为你必须使用正确的加入。 谢谢 Pankil Hello, I think you have to use the right join. Thanks Pankil