Question

在SQL Server中，需要检查select的结果是否在where子句中。

尝试以下操作。但失败了。需要同样的帮助。

(SELECT FLDMODDATE 
 FROM EMPLOYEE 
 WHERE FLDRECNUMBER = 432893)  = '2019-02-05'

Answer 1

我认为您想要exists：

select (case when exists (SELECT 1 
                          FROM EMPLOYEE 
                          WHERE FLDRECNUMBER = 432893 and FLDMODDATE  = '2019-02-05'
                         )
             then 'true' else 'false'
        end)

或者，如果使用的是T-SQL代码：

 if exists (SELECT 1 
            FROM EMPLOYEE 
            WHERE FLDRECNUMBER = 432893 and FLDMODDATE  = '2019-02-05'
           )

Answer 2

您需要某种IF。

IF (select FLDMODDATE from EMPLOYEE where FLDRECNUMBER = 432893)  = '2019-02-05'
BEGIN
    <Code here to do something>
END

SQL比较日期

2 个答案: