SQL将字符转换为日期时间

Question

我有以下t-sql：

set @sql = 'select id, query from '+@tablename+' where '+GETUTCDATE()+'> cast(ExpirationDate as datetime)'
execute sp_executesql @sql

我收到此错误：

从字符串转换日期和/或时间时转换失败。

我该如何正确转换呢？

Answer 1

只需将函数调用放在查询字符串中：

set @sql = 'select id, query from '+@tablename+' where GETUTCDATE() > cast(ExpirationDate as datetime)';

在调用sp_executesql之前，将其放入没有任何优势。

Answer 2

SET @sql = 
    'SELECT id, query 
    FROM '+@tablename+' 
    WHERE CAST('''+CAST(GETUTCDATE() AS VARCHAR(30))+''' AS DATETIME) 
          > CAST(ExpirationDate AS datetime)'
EXECUTE sp_executesql @sql