Sql server 删除SQL Server中的隐式转换

我试图从数据库中消除隐式转换

        SELECT DISTINCT ba.BookingID INTO #temp1
        FROM BookedItemsAudit_tbl bia  
        INNER JOIN BookingAudit_tbl ba ON bia.BookingAuditID = ba.BookingAuditID    
        INNER JOIN User_tbl u ON  u.UserId  = CAST(ba.UpdatedById AS INT)
        WHERE bia.BookedItemTypeId IN (1, 58, 60)   
        AND u.UserId = 5

我在UpdatedByID字段上添加了下面的CAST语句，因为这是一个Char（10），它连接到FROM语句中的一个INT。但我仍然得到隐式转换。我一定错过了什么明显的东西

        SELECT DISTINCT ba.BookingID INTO #temp1
        FROM BookedItemsAudit_tbl bia  
        INNER JOIN BookingAudit_tbl ba ON bia.BookingAuditID = ba.BookingAuditID    
        INNER JOIN User_tbl u ON  u.UserId  = CAST(ba.UpdatedById AS INT)
        WHERE bia.BookedItemTypeId IN (1, 58, 60)   
        AND u.UserId = 5

这是简化的模式

        SELECT DISTINCT ba.BookingID INTO #temp1
        FROM BookedItemsAudit_tbl bia  
        INNER JOIN BookingAudit_tbl ba ON bia.BookingAuditID = ba.BookingAuditID    
        INNER JOIN User_tbl u ON  u.UserId  = CAST(ba.UpdatedById AS INT)
        WHERE bia.BookedItemTypeId IN (1, 58, 60)   
        AND u.UserId = 5

BOOKINGAUDIT_TBL
Column_name     Type        Length
BookingAuditID  int         4
BookingID       int         4
UpdatedByID     CHAR        10
UpdatedBy       varchar     50
UpdatedDate     datetime    8
TotalMargin     money       8
BookingStatusId int         4

 USER_TBL
 Column_name    Type        Length
 UserId         int         4
 FullName       varchar     100
 UserName       varchar     20

此链接中的完整查询和架构

        SELECT DISTINCT ba.BookingID INTO #temp1
        FROM BookedItemsAudit_tbl bia  
        INNER JOIN BookingAudit_tbl ba ON bia.BookingAuditID = ba.BookingAuditID    
        INNER JOIN User_tbl u ON  u.UserId  = CAST(ba.UpdatedById AS INT)
        WHERE bia.BookedItemTypeId IN (1, 58, 60)   
        AND u.UserId = 5

        SELECT DISTINCT ba.BookingID INTO #temp1
        FROM BookedItemsAudit_tbl bia  
        INNER JOIN BookingAudit_tbl ba ON bia.BookingAuditID = ba.BookingAuditID    
        INNER JOIN User_tbl u ON  u.UserId  = CAST(ba.UpdatedById AS INT)
        WHERE bia.BookedItemTypeId IN (1, 58, 60)   
        AND u.UserId = 5

附件是执行计划中出现提示时的错误消息

        SELECT DISTINCT ba.BookingID INTO #temp1
        FROM BookedItemsAudit_tbl bia  
        INNER JOIN BookingAudit_tbl ba ON bia.BookingAuditID = ba.BookingAuditID    
        INNER JOIN User_tbl u ON  u.UserId  = CAST(ba.UpdatedById AS INT)
        WHERE bia.BookedItemTypeId IN (1, 58, 60)   
        AND u.UserId = 5

警告是关于显式转换，而不是隐式转换。您显示的工具提示没有提到

CONVERT\u IMPLICIT

        SELECT DISTINCT ba.BookingID INTO #temp1
        FROM BookedItemsAudit_tbl bia  
        INNER JOIN BookingAudit_tbl ba ON bia.BookingAuditID = ba.BookingAuditID    
        INNER JOIN User_tbl u ON  u.UserId  = CAST(ba.UpdatedById AS INT)
        WHERE bia.BookedItemTypeId IN (1, 58, 60)   
        AND u.UserId = 5

CAST（ba.UpdatedById为INT）

在计划中显示为

CONVERT（INT，ba.UpdatedById，0）

并警告您这一点（它阻止对ba.UpdatedById进行索引搜索）

        SELECT DISTINCT ba.BookingID INTO #temp1
        FROM BookedItemsAudit_tbl bia  
        INNER JOIN BookingAudit_tbl ba ON bia.BookingAuditID = ba.BookingAuditID    
        INNER JOIN User_tbl u ON  u.UserId  = CAST(ba.UpdatedById AS INT)
        WHERE bia.BookedItemTypeId IN (1, 58, 60)   
        AND u.UserId = 5

---

若要停止看到此警告，您需要修复架构，以便加入到相同数据类型的列中。

您需要发布表的架构以及收到的确切错误消息。若要使您的问题更易于访问，链接到上的一个示例，其中包含一些导致失败的数据。我们还可以查看BookedItemsAudit的架构吗_tbl@tass感谢您提供的SQLFiddle链接。我以前从未使用过那个网站，看起来非常有用和有用intuitive@robinDay嗨，罗宾，我想我应该把这些东西贴到SQL fiddle上，以防我漏掉了什么@martin smith，好的，谢谢martin，第二轮时，我跳了枪，没有正确阅读错误。。。没想到显式转换后仍会产生警告。。。。改变场地有点棘手@DamagedGoods-警告是提醒您显式的

强制转换

无法组织，并阻止在

ba.UpdatedById

上进行索引搜索。顺便问一下，你们都投了反对票并接受了这个答案吗？真诚的道歉！我本想对这个答案投赞成票，但现在它被卡住了。。我会发一封电子邮件给管理员，或者如果你对答案稍加修改，我想我可以更改答案vote@DamagedGoods-啊，谢谢。我觉得这很奇怪！我现在编辑了答案。

        SELECT DISTINCT ba.BookingID INTO #temp1
        FROM BookedItemsAudit_tbl bia  
        INNER JOIN BookingAudit_tbl ba ON bia.BookingAuditID = ba.BookingAuditID    
        INNER JOIN User_tbl u ON  u.UserId  = CAST(ba.UpdatedById AS INT)
        WHERE bia.BookedItemTypeId IN (1, 58, 60)   
        AND u.UserId = 5