为几个列生成具有给定值分布的数据。
Generate data with given distribution of values for several columns.
我们可以使用该函数为代理键列生成惟一值。
It can be used to generate unique values for the surrogate key column.
如果要为具有唯一约束的列生成数据,则很可能会失败。
If you are generating data for columns that have unique constraints, it will likely fail.
You could run the reaction, take solid iron gaseous oxygen, form iron oxide, measure the heat of formation of it, tabulate it.
你可以进行一个反应,用固态铁和氧气生成氧化铁,测量它的生成热,列成表格。
We can tabulate them. We can know them, and then when we have reactions that inter-convert different compounds, we can calculate the heat of reaction is just the difference between the heat of formation of the reactants, and the heat of formation of the products, right.
种化合物的生成热,可以把它们列成表,可以认知它们,而当我们要处理,在不同化合物间转变的反应时,我们只要计算反应物和,生成物的生成热之间的不同,就能计算出反应热。
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