Without knowing unique attributes of the changed users, it is impossible to construct SQL query statement that retrieve only the changed data from the users table.
在不知道已改变用户的唯一属性的情况下，构造一个SQL声明去users表中重新获取已经改变的数据是可能的。
To retrieve structured type data from a table, there must be some way to convert that type into a single scalar value whose type, in turn, must be based on one of the built-in DB2 data types.
为了从表中检索结构化类型数据，必须有一些将类型转换成一个标量值，换句话说，这些值的类型必须基于某种内置的DB2 数据类型。
With the table now populated with data and a means to access it, retrieve the amount overdue from account 12345.
现在表中已经填充了数据，并且可以使用某种方式访问它，那么现在从帐户12345中检索过期时间量。
This data set must include the WI_ITEMID column in the output, because this table provides the key that you will use to retrieve the links from these work items.
该数据集合必须包含输出中的wi_itemid列，因为该表提供了您将会使用到的键，来获取来自这些工作项的联系。
The same is true for retrieving data; every time you retrieve data from the ORDER_ITEMS table, you also want to get the order information, so order table will be accessed too.
对于抓取数据也是一样；每当从order_items表抓取数据时，还需要获取订单信息，因此还要访问order表。
Next, you get the session reference, and then retrieve the table data (vector of value objects) and combo box data (vector of strings) from the session.
下一步，得到会话引用，然后从会话中获取表格数据(值对象的vector)和组合框数据(字符串的vector)。
In this case it will retrieve data starting from the first row and then sequentially until it reaches the last row in the table.
在本例中，它从第一行开始检索数据，然后按顺序检索，直到达到表中的最后一行。
In this case it will retrieve data starting from the first row and then sequentially until it reaches the last row in the table.
在本例中，它从第一行开始检索数据，然后按顺序检索，直到达到表中的最后一行。
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