对于信函邮票盖销机用戳的戳式,1992年邮电部邮政总局指定了两种戳式,一种为左右格式,日戳位于左侧,水波纹戳记位于右侧;另一种是上下格式,日戳位于下侧,水波纹戳记位于上侧。为便于整理,笔者将这两种戳式戏称为A型戳式和B型戳式。
一方面,没有显式地标明丢失的数据,而只是通过不存在的行和时间戳进行了简单的标记。
For one thing, missing data is not explicitly indicated, but is simply marked by an absent line and time stamp.
对于行修改时间戳列(只针对这种列),如果该列使用IMPLICITLY hidden属性定义,那么当对表列进行隐式引用时,不会对该列执行外部化。
For row change timestamp columns only, if the column is defined with the IMPLICITLY HIDDEN attribute, then it is not externalized when there is an implicit reference to the columns of the table.
这意味着,在SQL路径中,只有在最后一次显式绑定时间戳之前定义的全局变量才会进行名称解析。
This means that only global variables in the SQL path that were defined before the last explicit bind time stamp are considered for global variable name resolution.
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