The system catalog does not identify which columns contain encrypted data, and the same column can include both encrypted and unencrypted values.

系统目录没有标识哪些列中包含加密的数据，同一列中可以同时包含加密和非加密数据。

youdao

Null and default value Compression (V8 GA) : Compression for null, zero length data in variable length columns and system default value.

null值和缺省值压缩(V 8 GA)：对变长列中的零长度空数据和系统缺省值进行压缩。

youdao

An index specification that defines a unique index also conveys information about the uniqueness of the index columns to the federated system.

定义惟一索引的索引规范还将关于索引列惟一性的信息传递给联邦系统。

youdao

If we need a 7, this is the ones column, the twos, fours, eights, so here are our columns and this was our decimal system a moment ago, and I wanna express the number 7 and the only digits 0 I now have access to are zero and one, whereas, in decimal, dec meaning 10.

如果你需要7，这是一位，二位，四位，八位，这是位数,刚才说的十进制的位数，我想表达7而且,只能采用数字1与，在十进制中，dec意思是十。

哈佛公开课 - 计算机科学课程节选

By the time I walk you in future columns through all the component parts of the system, or at least the ones that can be understood by human life form, you will see that there is plenty of blame to go around here, including for you and me.

FORBES: The Truth About Health Care's Waste, Fraud and Abuse