| 单词 | unique constraint | ||||||||||||||
| 释义 | unique constraint
更多释义 收起释义 例句释义: 唯一性约束,唯一约束,惟一性约束 1. Columns of a unique index are allowed to be NULL, while columns in a unique constraint are not. 唯一索引的列可以为NULL，而唯一约束的列不能为NULL。 www.ianywhere.com 2. However, changing the length of a variable-length column used in a CHECK or UNIQUE constraint is allowed. 但是，允许更改用于CHECK或UNIQUE约束中的长度可变的列的长度。 msdn2.microsoft.com 3. Create a unique constraint to ensure no duplicate values are entered in specific columns that do not participate in a primary key. 创建唯一约束可确保在不参与主键的特定列中不输入重复值。 msdn2.microsoft.com 4. A unique constraint guarantees that there are no duplicates in a specific column and allows you to define a primary key. 唯一的条件约束保证在特定资料行内没有重复，并可让您定义主要索引键。 technet.microsoft.com 5. Make a one-to-many relationship if only one of the related columns is a primary key or has a unique constraint. 如果在相关列中只有一列是主键或具有唯一约束，则创建一对多关系。 msdn2.microsoft.com 6. In Server Explorer, select the table to which you want to add a unique constraint, and from the Database menu click Open Table Definition. 在服务器资源管理器中，选择要将唯一约束添加到的表，再从“数据库”菜单中单击“打开表定义”。 msdn2.microsoft.com 7. An index created as part of a PRIMARY KEY or UNIQUE constraint is automatically given the same name as the constraint name. 创建为PRIMARYKEY或UNIQUE约束的一部分的索引将自动给定与约束名称相同的名称。 technet.microsoft.com 8. A UNIQUE constraint enforces the uniqueness of the values in a set of columns, so no duplicate values are entered. 强制UNIQUE约束在一列设置值的唯一性，所以没有重复的值输入。 wenwen.soso.com 9. In order to create a foreign key relationship, at least one of the two tables must have a primary key or unique constraint defined. 要创建外键关系，两个表中必须至少有一个定义了主键或唯一约束。 msdn2.microsoft.com 10. When you select the type, the appropriate dialog box opens ( Unique Constraint or Foreign Key Constraint) to help you create the constraint. 显示适当的对话框（唯一约束或外键约束），从而允许您更改约束的属性。 msdn.microsoft.com 1. If CLUSTERED is specified for a UNIQUE constraint and a PRIMARY KEY constraint is also specified, the PRIMARY KEY uses NONCLUSTERED. 如果为UNIQUE约束指定了CLUSTERED，并且指定了PRIMARYKEY约束，则PRIMARYKEY使用NONCLUSTERED。 technet.microsoft.com 2. This method can cause unpredictable results, and errors might appear if any one of the columns has a unique constraint. 此方法会导致不可预知的结果，如果其中任何一列具有唯一约束，则还可能会出现错误。 msdn2.microsoft.com 3. A unique index , UNIQUE constraint, or PRIMARY KEY constraint cannot be created if duplicate key values exist in the data . 如果数据中存在重复的键值，则不能创建唯一索引、UNIQUE约束或PRIMARYKEY约束。 www.bing.com 4. This class can be used to identify a unique constraint among a set of elements. 此类可用于标识一组元素中的唯一约束。 msdn2.microsoft.com 5. Alternatively, setting the Unique property of a single column to false removes any unique constraint that may exist. 或者，通过将单列的Unique属性设置为false，可移除可能存在的任何唯一约束。 msdn2.microsoft.com 6. To generate data for a user-defined type column with a unique constraint, you must use the data bound generator or a custom data generator. 若要为具有唯一约束的用户定义的类型列生成数据，必须使用数据绑定生成器或自定义数据生成器。 msdn2.microsoft.com 7. There are no significant differences between creating a UNIQUE constraint and creating a unique index independent of a constraint. 创建UNIQUE约束和创建独立于约束的唯一索引没有明显的区别。 msdn2.microsoft.com 8. Specifies the start of the definition for a PRIMARY KEY or UNIQUE constraint. 指定PRIMARYKEY或UNIQUE约束的定义起点。 msdn2.microsoft.com 9. This set of columns may be generated from a base table primary key, a unique constraint or a unique index. 这组列可以从基表主键、唯一约束或唯一索引生成。 msdn2.microsoft.com 10. All of the tables in the main data connection must contain a primary key, unique constraint, or unique index. 主数据连接中的所有表都必须包含一个主键、唯一约束或唯一索引。 office.microsoft.com 1. You can also create a unique constraint for a column by setting the Unique property of the column to true. 还可以通过将列的Unique属性设置为true，为某列创建唯一约束。 msdn2.microsoft.com 2. Index imposing the UNIQUE constraint on the column designated as the unique key column. 对于指定为唯一键列的列施加UNIQUE约束的索引。 technet.microsoft.com 3. Before you create a relationship, you must first define a primary key or unique constraint for your table. 在创建关系之前，必须首先为表定义主键或唯一约束。 msdn2.microsoft.com 4. There is a difference between a unique constraint on a table and a unique index. 表的唯一约束和唯一索引是有区别的。 www.ianywhere.com 5. Marking a column as a Primary Key in the Dataset designer will create a Unique Constraint. 在数据集设计器中将列标记为主键会创建一个唯一约束。 msdn2.microsoft.com 6. Creating a PRIMARY KEY or UNIQUE constraint automatically creates a unique index on the specified columns. 创建PRIMARYKEY或UNIQUE约束会自动为指定的列创建唯一索引。 msdn2.microsoft.com 7. Can't remove unique constraint since it's the primary key of a table. 唯一约束是表的主键，因此不能移除。 www.dictall.com 8. Unless a clustered index is explicitly specified, a unique, nonclustered index is created by default to enforce the UNIQUE constraint. 除非显式指定了聚集索引，否则，默认情况下将创建唯一的非聚集索引以强制执行UNIQUE约束。 technet.microsoft.com 9. This clause is not allowed if the column is specified in the primary key, or in a unique constraint of the table (SQLSTATE 42831). 如果表的主键或惟一性约束中指定了这个列，那么不允许使用这个子句（SQLSTATE42831）。 www.ibm.com 10. Specifies whether a unique constraint applies to this column. 指定是否有唯一的约束应用于此列。 msdn2.microsoft.com 1. Name of the unique constraint definition for referenced table. 所引用表的唯一约束定义的名称。 msdn2.microsoft.com 2. Tables must have the same primary key, unique index, or unique constraint. 表必须具有相同的主键、唯一索引或唯一约束。 technet.microsoft.com 3. Verify that the correct column is selected in the Unique Constraint dialog box. 确认在“唯一约束”对话框中选择了正确的列。 msdn2.microsoft.com 4. Used in a CHECK or UNIQUE constraint. 用于CHECK或UNIQUE约束中的列。 msdn2.microsoft.com 5. In Server Explorer, select the table with the unique constraint, and from the Database menu click Open Table Definition. 在服务器资源管理器中，选择包含该唯一约束的表，再从“数据库”菜单中单击“打开表定义”。 msdn2.microsoft.com 6. The following example adds a new column with a UNIQUE constraint. 以下示例将添加一个包含UNIQUE约束的新列。 msdn2.microsoft.com 7. You set a DataColumn to contain unique values by adding a unique constraint to a data table. 通过向数据表添加唯一约束，可以将DataColumn设置为包含唯一值。 msdn2.microsoft.com 8. Allows you to place a unique constraint on one or more columns in a table in an untyped dataset. 允许您将唯一约束放置在非类型化数据集中的表的一个或多个列上。 msdn2.microsoft.com 9. Unique constraint that checks that the new values in a column are unique in the table. 唯一约束，检查列中的新值在表中是否是唯一的。 msdn2.microsoft.com 10. Click Add and then select Unique Constraint or Foreign Key Constraint from the drop-down list. 单击“添加”，然后从下拉列表中选择“唯一约束”或“外键约束”。 msdn2.microsoft.com 1. The Unique Constraint or Foreign Key Constraint dialog box is displayed. 即显示“唯一约束”或“外键约束”对话框。 msdn2.microsoft.com 2. 4For every PRIMARY KEY and UNIQUE constraint defined on a table, an index is created on those columns. 4对于表中定义的每一个PRIMARYKEY和UNIQUE约束，将在这些列上创建索引。 msdn2.microsoft.com 3. The matching column from the primary table is a primary key or has a unique constraint. 来自主键表的匹配列是主键或具有唯一约束。 msdn2.microsoft.com 4. Index_id The index ID for a unique constraint. index_id唯一约束的索引ID。 www.ianywhere.com 5. You can create a UNIQUE constraint as part of the table definition when you create a table. 创建表时，可以创建UNIQUE约束作为表定义的一部分。 technet.microsoft.com 6. Property, which creates a unique constraint on the column. 属性，使用该属性可以在列上创建唯一约束。 msdn2.microsoft.com 7. You can specify a unique constraint for other columns by setting their. 可以为它们指定唯一约束。 msdn2.microsoft.com 8. There are no significant differences between creating a UNIQUE constraint and creating a unique index that is independent of a constraint. 创建UNIQUE约束和创建与约束无关的唯一索引并没有明显的区别。 msdn2.microsoft.com 9. A Boolean value indicating a unique constraint on the column. 指示列上的唯一约束的布尔值。 msdn2.microsoft.com 10. Name of schema that contains the UNIQUE constraint. 包含UNIQUE约束的架构的名称。 technet.microsoft.com 1. You cannot delete a UNIQUE constraint if the associated column is used as the full-text key of the table. 如果相关联的列被用作表的全文键，则不能删除UNIQUE约束。 technet.microsoft.com 2. Specifies that a clustered or nonclustered index is created for the PRIMARY KEY or UNIQUE constraint. 指定为PRIMARYKEY或UNIQUE约束创建聚集或非聚集索引。 msdn2.microsoft.com 3. Can't remove unique constraint '{0}'. Remove foreign key constraint '{1}' first. 不能移除唯一的约束“{0}”。请首先移除外键约束“{1}”。 www.dictall.com 4. The unique constraint is created in the database when you save the table. 当保存表时，将在数据库中创建该唯一约束。 msdn2.microsoft.com 5. Can't remove unique constraint since it's the primary key of table {0}. 唯一约束是表{0}的主键，因此不能移除。 www.dictall.com 6. A unique constraint, which guarantees that a column in the table contains no duplicates. 唯一约束，它保证表中的列不包含重复内容。 msdn2.microsoft.com 7. If a UNIQUE constraint already exists, you can modify or delete it. 如果UNIQUE约束已经存在，可以修改或删除它。 technet.microsoft.com 8. Indicate that a clustered or a nonclustered index is created for the PRIMARY KEY or UNIQUE constraint. 指示为PRIMARYKEY或UNIQUE约束创建聚集索引还是非聚集索引。 msdn2.microsoft.com 9. When you create a logical primary key, a unique constraint is created in the data source view and marked as a primary key constraint. 创建逻辑主键时，将在数据源视图中创建一个唯一约束并将其标记为主键约束。 msdn2.microsoft.com 10. The Database Engine automatically creates a UNIQUE index to enforce the uniqueness requirement of the UNIQUE constraint. 数据库引擎将自动创建UNIQUE索引来强制执行UNIQUE约束的唯一性要求。 technet.microsoft.com 1. To create a UNIQUE constraint on an existing table 在现有表中创建UNIQUE约束 technet.microsoft.com 2. By defining a PRIMARY KEY or UNIQUE constraint on a column by using CREATE TABLE or ALTER TABLE 使用CREATETABLE或ALTERTABLE对列定义PRIMARYKEY或UNIQUE约束 technet.microsoft.com 3. To create a PRIMARY KEY or UNIQUE constraint when you create a table 在创建表时创建PRIMARYKEY或UNIQUE约束 msdn2.microsoft.com 4. To create a UNIQUE constraint when you create a table 在创建表时创建UNIQUE约束 technet.microsoft.com 5. To create a unique constraint 创建唯一约束 msdn2.microsoft.com 6. To modify a unique constraint 修改唯一约束 msdn2.microsoft.com 7. To delete a unique constraint 删除唯一约束 msdn2.microsoft.com |
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