For example, for family info and a member date, the column key is info:date.
例如，对于系列info和成员date，列键为 info:date。
The column key is the concatenation of the family name, the: symbol, and the label.
column键由族名、：号和标签组成。
For each column in the partitioning key of the joined tables, an equijoin predicate must exist.
对于被合并的表的分区键内的每列，必须存在一个同等连接的谓语。
As we mentioned above, they all have a column named ID as a primary key.
前面我们提过，它们都有一个叫作id的列，并将该列作为主键。
So a different solution was found if an identifying column like a primary key is found in the table.
所以，如果在表中找到一个标识列，例如主键，则可以找到一种不同的解决方案。
To convert an existing column into a primary key, click on the column (property in the class) in the diagram.
要转换一个已有的列成为一个主键，在图中点击这个列(类中的属性)。
The application never knows what value is put into the primary key column after running the INSERT statement.
在运行insert语句之后，应用程序将永远都不知道放入了主键列中的是什么值。
The tables are joined over a common key column (ID).
这两个表通过一个共同的键列(ID)进行联结。
When you create a table, you can add an extra column to be the surrogate key.
当创建一个表时，可以添加一个额外的列作为代理键。
If one is not supplied, one is created by default from the first column of the primary key.
如果没有提供分区键，则默认地从主键的第一个列创建分区键。
We selected TITLE as the key column for convenience.
为了简便，我们选择TITLE作为主键列。
It can be used to generate unique values for the surrogate key column.
我们可以使用该函数为代理键列生成惟一值。
Also in the query rewrite vein, modifying a SELECT to get rid of a range-type predicate can increase performance by improving index key column matching.
另外，在查询重写状态下，修改SELECT来摆脱一个范围型谓词，可以通过提高索引键列匹配增强性能。
TP will only benefit those queries that include the table partitioning key column.
TP只对那些包括表分区键列的查询有利。
Note, however, that we cannot update the primary key columns or any other key columns that you declare; in this case, EMP_ID is a primary key column.
但是请注意，我们不能修改您声明的主键列或任何其他的键列；在本例中，EMP _ ID是主键列。
In Listing 5, you have a standard primary key column called PO_ID (that is, purchase order ID).
在清单5中，您有一个称为PO_ID的标准主键列(即订单id)。
This surrogate column can be designated the primary key column.
可以将该代理列指定为主键列。
If using the above CSV file to retrieve a state name based on a state abbreviation, you can set up the lookup to use column 1 as the key column and column 0 as the value column.
如果使用以上CSV文件根据国家缩写检索一个国家名，您可以设置查找来使用列1作为键列，并将列0作为值列。
If a primary key is specified in the CREATE TABLE statement, the first column of the primary key is used as the distribution key.
如果在CREATEtable语句中指定了一个主键，那么主键的首列会被用作分配键。
The first column lists the key and the other column displays information about the key.
第一列列出键，另一列显示有关该键的信息。
When doing a lookup in a CSV file, the properties allow you to specify which column is used as the key column, and which is used as the value column.
当在CSV文件中执行一个查找时，属性允许您指定将哪个列用作键列，以及将哪个列用作值列。
The first column (ID) is the primary key of the table.
第一列(ID)是此表的主键。
An arbitrary key is one column and is almost always smaller than an operationally derived key.
任意键是一列，通常比操作派生的键要小。
The example USES the ID column as the join key.
示例使用id列作为连接键。
You've also identified the id column as the table's primary key.
还将ID列标识为表的主键。
Rails USES the primary key column id for various recordkeeping and referencing tasks.
Rails使用主键列id来完成各种记录保持和引用任务。
If the join key is a composite key, each key column must be prefixed with the PRIOR operator.
如果联接键是一个复合键，那么必须使用PRIOR运算符为每个键所在的列加上前缀。
If informational check constraints exist on the primary key column, you should explicitly specify informational check constraints on their corresponding foreign key columns. For example.
如果在主键列上存在信息检查约束，那么应该在它们相应的外键列上指定信息检查约束。
The "ID" is a generic key column but is not used in the reporting.
“ID”是一个类属键（generic key）列，但是未在报告中使用。
For an index key column that is of variable length.
具有可变长度的索引键列。
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