primarykey

  • un.主关键字;主码
  • 网络主键;主表的主键信息;主键约束

primarykeyprimarykey

primarykey

主关键字

winform 分页控件 - r.小怪兽的日志 - 网易博客 ... 1.Tables: 表名称,视图 2.PrimaryKey: 主关键字 4.CurrentPage: 当前页码 ...

主码

主码PrimaryKey):一个关系中的某个属性(或属性组),根据它(们)的值能唯一标识关系中的各个元组,且又不含有多 …

主键

主键Primarykey)是UniqueConstraints的一种特殊类型。ADONET对象模型中的DataRowCollection对象可以用Find方法来根 …

主表的主键信息

CodeSmith中自带一个程序集SchemaExplorer.dl... ... PrimaryKeyTable: 主键表,即主表 PrimaryKey: 主表的主键信息 Table: …

主键约束

>>主键约束(PRIMARYKEY):主键表示一个唯一的标识,本身不能为空. 例如,身份证号是唯一的,不可重复,不可为空,则可以使用主 …

主键值

3-4-2 主键值(PrimaryKey) 3-5 数据库的范式(Normalization) 3-5-1 第一范式(FirstNormalForm,1NF) 3-5-2 第二范式(SecondNo…

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However, you cannot change the length of a column defined with a PRIMARY KEY constraint. 但是,不能更改使用PRIMARYKEY约束定义的列长度。
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You cannot change the length of a column defined with a PRIMARY KEY or FOREIGN KEY constraint. 无法更改用PRIMARYKEY或FOREIGNKEY约束定义的列的长度。
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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。
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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。
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In addition, the CREATE TABLE and ALTER TABLE statements can be used to set locking granularity on PRIMARY KEY and UNIQUE constraints. 另外,CREATETABLE和ALTERTABLE语句还可用于设置PRIMARYKEY和UNIQUE约束的锁定粒度。
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This includes both DDS-created files and SQL indexes as well as physical files with a Primary Key constraint. 这包括DDS创建的文件和SQL索引,以及带有PrimaryKey约束的物理文件。
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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。
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Identity columns are commonly used in conjunction with PRIMARY KEY constraints to serve as the unique row identifier for the table. 标识列通常与PRIMARYKEY约束一起用作表的唯一行标识符。
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PRIMARY KEY columns cannot be modified through an UPDATE statement if the member tables have. 列,则PRIMARYKEY列无法通过UPDATE语句进行修改。
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NULL can be specified in ALTER COLUMN to force a NOT NULL column to allow null values, except for columns in PRIMARY KEY constraints. 在ALTERCOLUMN语句中指定NULL,可以强制NOTNULL列允许空值,但PRIMARYKEY约束中的列除外。
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The UNIQUE or PRIMARY KEY constraint can contain a computed column as long as it satisfies all conditions for indexing. UNIQUE或PRIMARYKEY约束只要满足所有索引条件,就可以包含计算列。
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This includes indexes that are created due to a UNIQUE or PRIMARY KEY constraint. 这包括由于UNIQUE或PRIMARYKEY约束而创建的索引。
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After applying the PrimaryKey-stereotype a key-icon is visible to the left of the attribute, as shown in Figure 10. 在应用PrimaryKey构造型之后,在属性的左边就会出现一个图标了,如图10所示。
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Because PRIMARY KEY constraints guarantee unique data, they are frequently defined on an identity column. 由于PRIMARYKEY约束可保证数据的唯一性,因此经常对标识列定义这种约束。
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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。
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Searches for duplicates of new index key values in insert and update operations, to enforce PRIMARY KEY and UNIQUE constraints. 搜索与插入和更新操作中的新索引键值重复的值,以强制PRIMARYKEY和UNIQUE约束。
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For indexes that enforce UNIQUE and PRIMARY KEY constraints, this value is always 1. 对于强制使用UNIQUE和PRIMARYKEY约束的索引,此值始终为1。
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The following example deletes a clustered index with a PRIMARY KEY constraint by dropping the constraint. 以下示例通过删除PRIMARYKEY约束删除了具有该约束的聚集索引。
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The DROP INDEX statement does not apply to indexes created by defining PRIMARY KEY or UNIQUE constraints. DROPINDEX语句不适用于通过定义PRIMARYKEY或UNIQUE约束创建的索引。这些约束是分别使用。
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You can do this by editing a table's PrimaryKey property and choosing the parts of the key from the drop-down list of columns. 可以通过编辑表的PrimaryKey属性并从列的下拉列表中选择此键的各部分来实现。
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Identity columns are typically used together with PRIMARY KEY constraints to serve as the unique row identifier for the table. 标识列通常与PRIMARYKEY约束一起使用,作为表的唯一行标识符。
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Member tables must have all PRIMARY KEY constraints on the same number of columns. 各个成员表中具有PRIMARYKEY约束的列数必须相同。
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A primary key can also be created by selecting the Primary Key tool in the tool palette and clicking on a table. 主键也可以透过选择工具面板中的PrimaryKey工具并在表上点选一下进行建立。
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The member tables should have all PRIMARY KEY constraints on the same number of columns. 成员表在编号相同的列上应具有所有PRIMARYKEY约束。
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Table form a composite PRIMARY KEY constraint for this table. 列构成了针对此表的复合PRIMARYKEY约束。
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Indexes are automatically created when PRIMARY KEY and UNIQUE constraints are defined on table columns. 对表列定义了PRIMARYKEY约束和UNIQUE约束时,会自动创建索引。
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Only one PRIMARY KEY constraint can be created for each table. 只能为每个表创建一个PRIMARYKEY约束。
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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。
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Changes to PRIMARY KEY constraints are checked with FOREIGN KEY constraints in related tables. 对PRIMARYKEY约束的更改可由相关表中的FOREIGNKEY约束检查。
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When you create a PRIMARY KEY constraint, a unique index on the column, or columns, is automatically created. 创建PRIMARYKEY约束时,将在列上自动创建唯一索引。