运行数据仓库兼容脚本时出现操作数冲突错误答案

【问题标题】：Am getting operand clash error when running a datawarehouse compatible script运行数据仓库兼容脚本时出现操作数冲突错误
【发布时间】：2018-06-13 16:38:44
【问题描述】：

您好，我收到如下错误：操作数类型冲突：日期与 int 不兼容。

以下是我在 SQL Server 上运行的查询：

CREATE TABLE val.census_last_month
WITH(
    DISTRIBUTION = ROUND_ROBIN
,   CLUSTERED COLUMNSTORE INDEX
)
 AS
  SELECT
    dt_mydate                                                                       AS dt_census,
    (SELECT count(DISTINCT encounter_id)
     FROM prod.encounter
     WHERE encounter_type = 'Inpatient' AND (ts_admit BETWEEN dt_mydate - 30 AND dt_mydate) AND
           (ts_discharge IS NULL OR ts_discharge > dt_mydate))                      AS census,
    (SELECT count(DISTINCT encounter_id)
     FROM prod.encounter
     WHERE encounter_type = 'Inpatient' AND cast(ts_admit AS DATE) = dt_mydate)     AS admits,
    (SELECT count(DISTINCT encounter_id)
     FROM prod.encounter
     WHERE encounter_type = 'Inpatient' AND cast(ts_discharge AS DATE) = dt_mydate) AS discharges
  FROM ref.calendar_day
  WHERE ref.calendar_day.dt_mydate BETWEEN (cast(getdate() as date) - 30) AND cast(getdate() as date);

【问题讨论】：

标签： azure azure-sqldw

【解决方案1】：

您需要使用 dateadd 函数。在此处查看详细信息。 https://docs.microsoft.com/en-us/sql/t-sql/functions/dateadd-transact-sql?view=sql-server-2017

【讨论】：

【解决方案2】：

此脚本存在多个问题，但是您能否确认以“ts_”开头的数据类型是以yyyyMMdd 格式存储为整数的日期，而以“dt_”开头的数据类型是DATE？

基于这些假设，这是我尝试的重写：

SELECT dt_mydate AS dt_census,
    (
    SELECT COUNT( DISTINCT encounter_id )
    FROM prod.encounter
    WHERE encounter_type = 'Inpatient' AND ( CAST( CAST( ts_admit AS CHAR(8) ) AS DATE ) BETWEEN DATEADD( day, -30, dt_mydate ) AND dt_mydate )
    AND ( ts_discharge IS NULL OR CAST( CAST( ts_discharge AS CHAR(8) ) AS DATE ) > dt_mydate)
    ) AS census,
    (
    SELECT COUNT( DISTINCT encounter_id )
    FROM prod.encounter
    WHERE encounter_type = 'Inpatient' AND CAST( CAST( ts_admit AS CHAR(8) ) AS DATE ) = dt_mydate
    ) AS admits,
    (
    SELECT COUNT( DISTINCT encounter_id )
    FROM prod.encounter
    WHERE encounter_type = 'Inpatient' 
    AND CAST( CAST( ts_discharge AS CHAR(8) ) AS DATE ) = dt_mydate
    ) AS discharges
FROM ref.calendar_day
WHERE ref.calendar_day.dt_mydate BETWEEN CAST ( DATEADD( day, -30, GETDATE() ) AS DATE ) AND CAST( GETDATE() AS DATE );

如果我的任何一个假设不正确，请告诉我，我会更新脚本。

【讨论】：