Question

我想生成一个跳过空值的序列号（即不计算空值）：

PAT_ID ENC_DATE  SEQ
------ --------  ---
1      null      null
1      05/01/15  1
2      01/01/14  1
2      null      null
2      02/11/14  2

目前：

SELECT  PAT_ID, ENC_DATE
        ,case when enc_date is not null then ROW_NUMBER() OVER (PARTITION BY pat_id ORDER BY end_date) end SEQ

生成（空值增加SEQ值）：

PAT_ID ENC_DATE  SEQ 
------ --------  ----
1      null      null
1      05/01/15  2   
2      01/01/14  1   
2      null      null
2      02/11/14  3

我错过了什么？

Answer 1

您可以在NULL：

中添加PARTITION BY项支票

SELECT  PAT_ID, ENC_DATE
        ,CASE WHEN enc_date IS NOT NULL 
                THEN ROW_NUMBER() OVER (PARTITION BY pat_id,CASE WHEN Enc_Dt IS NULL THEN 1 END ORDER BY end_date) 
         END SEQ
        ,dense_rank() OVER (PARTITION BY pat_id ORDER BY enc_date) DR

Answer 2

您希望最后考虑空日期：

SELECT  PAT_ID, ENC_DATE
,case when enc_date is not null 
  then ROW_NUMBER() OVER (PARTITION BY pat_id ORDER BY ISNULL(enc_date, '2079-06-05T23:59:00')) end SEQ
,dense_rank() OVER (PARTITION BY pat_id ORDER BY ISNULL(enc_date, '2079-06-05T23:59:00')) DR
from t;

结果：

PAT_ID  ENC_DATE    SEQ     DR
1       2015-05-01  1       1
1       (null)      (null)  2
2       2014-01-01  1       1
2       2014-02-11  2       2
2       (null)      (null)  3

生成序列号，跳过空值

2 个答案: