在SQL比较两个变量WHILE循环

Question

我收到错误

消息102，级别15，状态1，行16
附近有语法错误@PacketCode“。

当我尝试执行。我的WHILE循环有些问题，但我看不到。有什么建议么？

DECLARE @PacketCode as varchar(255) 
SET @PacketCode = 'ZZZ_Archive_TEST' 

DECLARE @Value as varchar(255) 
SET @Value = '' 

DECLARE @i int 
SET @i = 1 

SELECT 
    @Value = (SELECT packetcode 
       FROM tblScriptReports 
       WHERE packetcode = @PacketCode) 

WHILE (@PacketCode = @Value) 
BEGIN 
    @PacketCode = @PacketCode + ' (' + @i + ')' 

    SELECT @Value = (SELECT packetcode 
        FROM tblScriptReports 
        WHERE packetcode = @PacketCode) 

    SET @i = @i + 1     
END 

SELECT @PacketCode 

Answer 1

尝试添加一个设置在@PacketCode前在BEGIN：

DECLARE @PacketCode as varchar(255) 
set @PacketCode = 'ZZZ_Archive_TEST' 

DECLARE @Value as varchar(255) 
set @Value = '' 

DECLARE @i int 
set @i = 1 

SELECT @Value = (SELECT packetcode 
      FROM tblScriptReports 
      WHERE packetcode = @PacketCode) 

WHILE (@PacketCode = @Value) 

BEGIN 

SET @PacketCode = @PacketCode + ' (' + @i + ')' 

    SELECT @Value = (SELECT packetcode 
        FROM tblScriptReports 
        WHERE packetcode = @PacketCode) 

    set @i = @i + 1     
END 

select @PacketCode 

Answer 2

在TSQL分配变量值与SET命令。

因此，不是这样的：

@PacketCode = @PacketCode + ' (' + @i + ')' 

必须这样做：

SET @PacketCode = @PacketCode + ' (' + @i + ')' 

搞笑的是你的代码这样做正确的其他地方。