Table and use an AS clause to name these columns for the display with the ij tool. Because the query joins these two tables (by using an implicit inner join), you can select columns from both tables.

因为查询(通过使用隐式内连接)将两个表连接，您可以从两个表中选择列。

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The difference between these two are, as the name suggests, one is made with 12 columns and the other one with 16 columns.

你会发现有两种规格：一个是12栏式的而另一个是16栏式的。他们的区别就像名字所说的，一个是按12栏分布一个按16栏。

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