Sql 在预期条件的上下文中指定的非布尔类型的表达式，有效性测试

如果发生以下情况，则会发生错误：NOT@DATECHECK，我正在尝试将行写入临时表ControlTable2。当ENTRYDATE字段中的数据为无效日期时，它存储为文本

代码：

@DATECHECK是位，而不是布尔值。您仍然需要检查@DATECHECK=1，解析器才能执行脚本。另请注意缺少的括号。

缺少的参数：SET@DATECHECK=SELECT isdatentrydatefrom ControlTable1应为：SET@DATECHECK=SELECT isdatentrydate FROM ControlTable1

ALTER PROCEDURE [dbo].[TEST_LOOP]

AS
BEGIN
DECLARE @DATECHECK AS bit

select *
into #ControlTable 
from dbo.dbConvert_APPT

select TOP 1 *
into #ControlTable2 
from dbo.dbConvert_APPT

TRUNCATE TABLE #ControlTable1

declare @SHELBY_CONTROL_ID BIGint

while exists (select * from #ControlTable)
begin

    select top 1 SHELBY_CONTROL_ID
    INTO #ControlTable1
    from #ControlTable
    order by SHELBY_CONTROL_ID asc

SET @DATECHECK = (SELECT isdate(ENTRYDATE FROM #ControlTable1)

IF not( @DATECHECK)

INSERT INTO #ControlTable2
SELECT * FROM #ControlTable1

END

    delete #ControlTable
    where SHELBY_CONTROL_ID = @SHELBY_CONTROL_ID  

drop table #ControlTable
drop table #ControlTable1

SELECT * FROM  #ControlTable2

END