Every record in the table has a unique ID called the primary key.

The data type of this is typically an unique ID or other index.

这种动作的数据类型通常是惟一ID或其他索引类型。

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Make sure each user has a unique ID and a unique name.

请确保每个用户都具有惟一ID和惟一名称。

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Prevent this situation by using unique ID mapping attributes.

使用惟一的ID映射属性可以防止出现这种情况。

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That unique ID is the best way to identify each member.

这个惟一的ID是识别每个成员最好的方法。

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The first column is the unique ID of the move.

第一列是步着的惟一ID。

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Selecting a unique ID will allow you to update the data in your drawing easily using the refresh command.

通过选择唯一id，可以使用“刷新”命令轻松地更新绘图中的数据。

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However, if the session data conflicts with a new index,( such as duplicate rows conflicting with a unique index), the index is not materialized for that session until the data is corrected.

但是，如果会话数据与某个新索引冲突（比如重复行在唯一的索引上冲突），则在数据纠正之前不会为该会话物化该索引。

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When you create or rebuild a unique index online, the index builder and a concurrent user transaction may try to insert the same key, therefore violating uniqueness.

联机创建或重新生成unique索引时，索引生成器和并发用户事务可能会尝试插入相同的键，从而违反唯一性。

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When a UNIQUE index is created on a column in Oracle10g, it ensures that the NOT NULL values entered in that column are unique.

当在Oracle10g中的列上创建UNIQUE索引时，会确保此列中输入的NOT NULL值是惟一的。

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But, in DB2 z/ OS if a UNIQUE index is created on a column, then only one NULL value can be inserted into it.

但是在DB2z/OS中，如果在列上创建UNIQUE索引，那么只能在其中插入一个NULL值。

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In a multi-partition database partition group, you can only create a unique index if it is a superset of the partitioning key.

在多分区数据库分区组中，如果索引是分区键的超集，那么只能创建一个惟一的索引。

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Make sure that you use the right keys in the WHERE clause, which should preferrably be either the primary key or a unique index.

要确保在WHERE子句中使用正确的键，这个键最好是主键或惟一索引。

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The "name" column will be a CHAR ( 30), set to NOT NULL, and have a unique index on it.

“name”列的类型是CHAR（30），不允许为空，而且根据此列建立了一个索引。

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Column '% s' cannot be excluded from the vertical partitioning because there is a unique index accessing this column.

不能从垂直分区操作中排除列''%1！''，因为有一个唯一索引正在访问该列。

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Also, before setting up replication in DB2, you will want to ensure that every database table has a primary key or unique index.

此外，在DB2中创建复制之前，您会希望保证每一个数据库表都具有一个主键或惟一索引。

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An index specification that defines a unique index also conveys information about the uniqueness of the index columns to the federated system.

定义惟一索引的索引规范还将关于索引列惟一性的信息传递给联邦系统。

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You can't create a unique index on this field because it contains duplicate values. Do you want to keep the existing index?

不能在该字段上创建唯一索引，因为字段中含有重复值。是否还用现有的索引？

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Newly added not nullable column ( s) are involved in the primary key or unique index ( constraint).

新添加的不可空列包含在主键或唯一索引（约束）中。

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In other words, all columns that are part of the partitioning key must be present in the primary key or unique index definition.

换句话说，作为分区键一部分的所有列都必须出现在主键或惟一索引定义中。

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Single-row update/ delete affected more than one row of a linked table. Unique index contains duplicate values

单行更新或删除影响链接表中的多行。唯一的索引包含重复数值

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