您要查找的是不是：
- The query determines whether some columns are part of an index key. 该查询确定某些列是否属于索引键。
- This means no two rows can have the same value for the index key. 这意味着任何两行都不能有相同的索引键值。
- A column is part of a clustered index key that may be null. 列是可能空聚集索引键的一部分。
- Up to 16 columns can be combined into a single composite index key. 一个组合索引键中最多可组合16列。
- Sum the length of each column that will be defined in the index key. 求索引键中将定义的每一列的长度之和。
- These column modification restrictions also apply to index key columns. 这些列修改限制也适用于索引键列。
- Each index key must be unique or contain a NULL in at least one column. 每个索引键必须是唯一的,或者至少在一列中包含NULL。
- Columns; however, such columns cannot be included in the clustered index key. 列;但聚集索引健中不能包含这类列。
- It reports only include columns for some queries, so index key columns must be manually selected. 它针对某些查询只报告包含列,因此必须手动选择索引键列。
- In this case, one of the include columns must be selected for the index key column. 在这种情况下,必须为索引键列选择包含列之一。
- Neither column of the output result set is a key, but together they form an index key. 输出结果集中的任一列都不是一个键,但是它们结合在一起将形成一个索引键。
- For indexes, the insertion point of a new row is set by the index key. 对于索引,新行的插入点由索引键设置。
- The UNLOAD TABLE statement allows you to unload a table in the order of the index key. UNLOAD TABLE语句可用于按照索引键的顺序卸载表。
- This value is part of the index key and is required to make sure that every row has a unique key value. 此值是索引键的一部分,用于确保每一行都具有唯一的键值。
- The LOAD TABLE statement inserts rows into the table in the order of the index key. LOAD TABLE语句可用于按照索引键的顺序在表中插入行。
- VSAM arranges records by an index key, relative record number, or relative byte addressing. VSAM通过一个索引键值,相关记录号或者相关字节地址来组织记录。
- Smaller index keys take less space and are more effective that larger keys. 与较大的键相比,较小的索引键占用的空间更小,并且更为有效。
- SQL Server navigates down the index to find the row corresponding to a clustered index key. 第二个参数，如果是''，表示影响该表的所有索引。
- The clustered index is implemented as a B-tree index structure that supports fast retrieval of the rows, based on their clustered index key values. 聚集索引按B树索引结构实现,B树索引结构支持基于聚集索引键值对行进行快速检索。
- An imprecise expression that forms the value of an index key column must reference a stored column in a base table underlying the view. 构成索引键列值的不精确表达式必须引用视图下基表中的存储列。
