not exist为何老是报错
请教各位：


SELECT ShortName, companyGUID
FROM dbo.Company
WHERE not EXIST(SELECT AllowReadGuid FROM dbo.PermissionRead WHERE dbo.Company.companyGUID = AllowReadGuid）

为何老是报错！

消息 156，级别 15，状态 1，第 3 行
关键字 'SELECT' 附近有语法错误。

无法绑定有多个部分组成的标识符"dbo.Company.companyGUID " not?exist
[解决办法]

SELECT  ShortName, companyGUID
FROM    dbo.Company
WHERE   not  exists(SELECT AllowReadGuid FROM dbo.PermissionRead WHERE dbo.Company.companyGUID = AllowReadGuid)