Question

我坚持使用CASE / WHEN声明我需要做的是检查HOSP_DISCHRG_TIME中是否找到了值 - 如果是，则在日期差异计算中使用HOSP_DISCHRG_TIME，否则使用当前日期。

这是我写的，但似乎不起作用。关于这种方法或其他方法的任何建议

由于史蒂夫

            -- Calculate L
            CASE

                WHEN HOSP_DISCHRG_TIME is NULL
                THEN
                      CASE
                          WHEN   ISNULL(DATEDIFF(dd,PAT_ENC.HOSP_ADMSN_TIME,GETDATE()),0) < 1 THEN 0 
                          When ISNULL(DATEDIFF(dd,PAT_ENC.HOSP_ADMSN_TIME,GETDATE()),0) BETWEEN 4 and 6 THEN 4 
                          WHEN   ISNULL(DATEDIFF(dd,PAT_ENC.HOSP_ADMSN_TIME,GETDATE()),0) BETWEEN 7 and 13 THEN 5 
                          WHEN  ISNULL(DATEDIFF(dd,PAT_ENC.HOSP_ADMSN_TIME,GETDATE()),0)>= 14 THEN 6
                          ELSE ISNULL(DATEDIFF(dd,PAT_ENC.HOSP_ADMSN_TIME,GETDATE()),0)
                ELSE 
                      CASE
                          WHEN   ISNULL(DATEDIFF(dd,PAT_ENC.HOSP_ADMSN_TIME,HOSP_DISCHRG_TIME),0) < 1 THEN 0 
                          WHEN ISNULL(DATEDIFF(dd,PAT_ENC.HOSP_ADMSN_TIME,HOSP_DISCHRG_TIME),0) BETWEEN 4 and 6 THEN 4 
                          WHEN   ISNULL(DATEDIFF(dd,PAT_ENC.HOSP_ADMSN_TIME,HOSP_DISCHRG_TIME),0) BETWEEN 7 and 13 THEN 5 
                          WHEN  ISNULL(DATEDIFF(dd,PAT_ENC.HOSP_ADMSN_TIME,HOSP_DISCHRG_TIME),0)>= 14 THEN 6
                          ELSE ISNULL(DATEDIFF(dd,PAT_ENC.HOSP_ADMSN_TIME,HOSP_DISCHRG_TIME),0)
                END 
                      END AS L,

Answer 1

我认为你只是错过了一个结束 -

-- Calculate L
CASE
    WHEN HOSP_DISCHRG_TIME is NULL
    THEN
          CASE
              WHEN   ISNULL(DATEDIFF(dd,PAT_ENC.HOSP_ADMSN_TIME,GETDATE()),0) < 1 THEN 0 
              When ISNULL(DATEDIFF(dd,PAT_ENC.HOSP_ADMSN_TIME,GETDATE()),0) BETWEEN 4 and 6 THEN 4 
              WHEN   ISNULL(DATEDIFF(dd,PAT_ENC.HOSP_ADMSN_TIME,GETDATE()),0) BETWEEN 7 and 13 THEN 5 
              WHEN  ISNULL(DATEDIFF(dd,PAT_ENC.HOSP_ADMSN_TIME,GETDATE()),0)>= 14 THEN 6
              ELSE ISNULL(DATEDIFF(dd,PAT_ENC.HOSP_ADMSN_TIME,GETDATE()),0)
          END -- Added this
    ELSE 
          CASE
              WHEN   ISNULL(DATEDIFF(dd,PAT_ENC.HOSP_ADMSN_TIME,HOSP_DISCHRG_TIME),0) < 1 THEN 0 
              WHEN ISNULL(DATEDIFF(dd,PAT_ENC.HOSP_ADMSN_TIME,HOSP_DISCHRG_TIME),0) BETWEEN 4 and 6 THEN 4 
              WHEN   ISNULL(DATEDIFF(dd,PAT_ENC.HOSP_ADMSN_TIME,HOSP_DISCHRG_TIME),0) BETWEEN 7 and 13 THEN 5 
              WHEN  ISNULL(DATEDIFF(dd,PAT_ENC.HOSP_ADMSN_TIME,HOSP_DISCHRG_TIME),0)>= 14 THEN 6
              ELSE ISNULL(DATEDIFF(dd,PAT_ENC.HOSP_ADMSN_TIME,HOSP_DISCHRG_TIME),0)
          END -- Fixed indentation
END AS L, -- Fixed indentation

因为这有效（它只是替换了我声明的变量而无法看到的列）：

DECLARE @HOSP_DISCHRG_TIME datetime
DECLARE @HOSP_ADMSN_TIME datetime
SET @HOSP_ADMSN_TIME = GETDATE() - 4

SELECT CASE
WHEN @HOSP_DISCHRG_TIME is NULL
    THEN
          CASE
              WHEN   ISNULL(DATEDIFF(dd,@HOSP_ADMSN_TIME,GETDATE()),0) < 1 THEN 0 
              When ISNULL(DATEDIFF(dd,@HOSP_ADMSN_TIME,GETDATE()),0) BETWEEN 4 and 6 THEN 4 
              WHEN   ISNULL(DATEDIFF(dd,@HOSP_ADMSN_TIME,GETDATE()),0) BETWEEN 7 and 13 THEN 5 
              WHEN  ISNULL(DATEDIFF(dd,@HOSP_ADMSN_TIME,GETDATE()),0)>= 14 THEN 6
              ELSE ISNULL(DATEDIFF(dd,@HOSP_ADMSN_TIME,GETDATE()),0)
          END
    ELSE 
          CASE
              WHEN   ISNULL(DATEDIFF(dd,@HOSP_ADMSN_TIME,@HOSP_DISCHRG_TIME),0) < 1 THEN 0 
              WHEN ISNULL(DATEDIFF(dd,@HOSP_ADMSN_TIME,@HOSP_DISCHRG_TIME),0) BETWEEN 4 and 6 THEN 4 
              WHEN   ISNULL(DATEDIFF(dd,@HOSP_ADMSN_TIME,@HOSP_DISCHRG_TIME),0) BETWEEN 7 and 13 THEN 5 
              WHEN  ISNULL(DATEDIFF(dd,@HOSP_ADMSN_TIME,@HOSP_DISCHRG_TIME),0)>= 14 THEN 6
              ELSE ISNULL(DATEDIFF(dd,@HOSP_ADMSN_TIME,@HOSP_DISCHRG_TIME),0)
    END 
END AS L

我编写NESTED CASE / WHEN语句的尝试无效

1 个答案: