sequence number

基本解釋

Assigns a sequence number for this event, if one has not been set by the event source.
如果事件源沒有設置序號的話，那麼爲這個事件分配一個序號。
Typically, the nonce can be implemented as a counter (a sequence number) or as a timestamp.
現(xiàn)時標志通常能實現(xiàn)爲計數(shù)器（一個序列數(shù)）或者時間戳。
Every SQL record has its own Unique Sequence Number, and you can also compute a custom unique number for all combined fields in the record.
每一條 SQL 記錄都有它自己的惟一序號，您可以爲記錄中的所有組郃字段計算一個定制的惟一編號。

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