Question

SQL查询以按特定日期条件进行过滤

SQL Server Management Studio V17.7

问题：我正在寻找与以下视图相关的指南：当Admit_Status = 1或Admit_Status = 0时，如何选择Start_Date在定义的日期范围之间的记录，如下所示：

条件应类似于：如果准入状态= 1，则dbo.PT_ASSIGNMENT.START_DATE> =向ifnull dbo.PT_ADMISSION.TERMINATION_DATE推荐的日期，然后now（）否则dbo.PT_ADMISSION.TERMINATION_DATE，或者如果准入状态= 0，则开始日期> = Referral_date到ifnull dbo.PT_ADMISSION.PROSPECT_TERM_DATE，然后now（）else dbo.PT_ADMISSION.PROSPECT_TERM_DATE

我的SQL查询（视图）不包含上述问题：

SELECT dbo.RES_BASIC.RESOURCE_ID,
    dbo.PT_ADMISSION.ADMISSION_ID,
    dbo.PT_ASSIGNMENT.START_DATE,
    (CASE PT_ADMISSION.PROSPECT_ADMIT_DATE WHEN NULL THEN PT_ADMISSION.ADMIT_DATE ELSE PT_ADMISSION.PROSPECT_ADMIT_DATE END) AS REFERRAL_DATE,
    dbo.PT_ADMISSION.ADMIT_DATE,
    dbo.PT_ADMISSION.PROSPECT_ADMIT_DATE,
    dbo.PT_ADMISSION.PROSPECT_TERM_DATE,
    dbo.PT_ADMISSION.TERMINATION_DATE,
    CASE WHEN PT_ADMISSION.ADMIT_DATE IS NOT NULL THEN 1 ELSE 0 END AS ADMIT_STATUS,
    dbo.PT_BASIC.PATIENT_CODE,
    dbo.RES_BASIC.NAME_FULL
FROM dbo.PT_BASIC
INNER JOIN dbo.PT_STATUS
    ON dbo.PT_BASIC.PATIENT_ID = dbo.PT_STATUS.PATIENT_ID
INNER JOIN dbo.A_PATIENT_STATUS
    ON dbo.PT_STATUS.ADMIN_SET_ID = dbo.A_PATIENT_STATUS.ADMIN_SET_ID
        AND dbo.PT_STATUS.STATUS_CODE = dbo.A_PATIENT_STATUS.STATUS_CODE
INNER JOIN dbo.O_DATASET
    ON dbo.PT_BASIC.DATASET_ID = dbo.O_DATASET.DATASET_ID
INNER JOIN dbo.PT_ADMISSION
    ON dbo.PT_BASIC.PATIENT_ID = dbo.PT_ADMISSION.PATIENT_ID
        AND dbo.PT_STATUS.ADMISSION_ID = dbo.PT_ADMISSION.ADMISSION_ID
INNER JOIN dbo.PT_ASSIGNMENT
    ON dbo.PT_BASIC.PATIENT_ID = dbo.PT_ASSIGNMENT.PATIENT_ID
INNER JOIN dbo.A_ASSIGNMENT_TYPE
    ON dbo.PT_ASSIGNMENT.ADMIN_SET_ID = dbo.A_ASSIGNMENT_TYPE.ADMIN_SET_ID
        AND dbo.PT_ASSIGNMENT.ASSIGNMENT_TYPE = dbo.A_ASSIGNMENT_TYPE.TYPE_ID
INNER JOIN dbo.RES_BASIC
    ON dbo.PT_ASSIGNMENT.RESOURCE_ID = dbo.RES_BASIC.RESOURCE_ID
WHERE (dbo.O_DATASET.DATASET_NAME = 'XXXXXXXXXX')
    AND (dbo.A_ASSIGNMENT_TYPE.DESCRIPTION = 'REFERRING PHYSICIAN')
GROUP BY dbo.RES_BASIC.NAME_FIRST + ' ' + dbo.RES_BASIC.NAME_LAST,
    dbo.RES_BASIC.RESOURCE_ID,
    dbo.PT_ADMISSION.ADMISSION_ID,
    dbo.PT_BASIC.PATIENT_CODE,
    dbo.PT_ASSIGNMENT.START_DATE,
    dbo.PT_ADMISSION.PROSPECT_TERM_DATE,
    dbo.PT_ADMISSION.PROSPECT_ADMIT_DATE,
    dbo.PT_ADMISSION.TERMINATION_DATE,
    dbo.PT_ADMISSION.ADMIT_DATE,
    dbo.RES_BASIC.NAME_FULL

Answer 1

您可以使用简单的AND和OR来将几乎所有“ if”放入条件中。

我很难在心理上解析您的“类似”部分，但要举一个通用的例子。

IF A THEN B ELSE C

可以翻译为(A AND B) OR (NOT A AND C)

注意：Bill Braskey的“评论”也值得考虑。如果条件逻辑变得足够复杂，则使用简单条件的数据库执行UNION查询的工作量可能会减少。您仍然需要其中一个条件为A AND B，另一个条件为NOT A AND C才能适当地应用条件，但是您需要从整体条件简化（尤其是考虑“ C”时）实际上可能是IF D THEN E ELSE F的翻译。

Answer 2

也许可以采取简单的方法，根据不同的要求编写两个查询并进行合并

SQL查询以按特定日期条件过滤

2 个答案: