SYSCAT.COLDIST contains entries for a certain table only if distribution statistics have been collected for at least one of its columns.
仅在收集了一个表中至少一个列的分布统计信息时,SYSCAT.COLDIST 才会包含关于该表的条目。
You can define guidelines that influence only a few attributes of an execution plan, such as index specification for a certain table in the query or join order for a pair of tables.
可以定义那些只影响执行计划的某些属性的准则,比如查询中的某个表的索引说明,或者一对表的连接顺序。
And what we've been talking about with all of these properties are, of course, how can we figure out what that is for a certain atom by looking at the periodic table, so we want to think about the periodic trend for atomic radius.
对于我们讲过的这些性质,我们所讨论的一直都是,当然是,我们如何能够判断某一个原子的这些性质,通过观察周期表,因此我们需要思考一下原子半径的周期性规律。
And you can find these compressibility factors in tables. If you want to know the compressibility factors for water, for steam, at a certain pressure and temperature, you go to a table and you find it.
各种气体的压缩系数,想知道水或者水蒸气,在某个温度和压强下的,压缩系数,查表就行了,这是实际气体状态方程的。
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