CREATE TABLE IF NOT EXISTS newbook_mast(book_idvarchar(15)NOTNULLUNIQUE,book_namevarchar(50),isbn_novarchar(15)NOTNULLUNIQUE,cate_idvarchar(8),aut_idvarchar(8),pub_idvarchar(8),dt_of_pub date,pub_langvarchar(15),no_pagedecimal(5,0)CHECK(no_page>0),# check constraint book_pricedecima...
[ CONSTRAINT constraint_name ] { { PRIMARY KEY | UNIQUE } [ CLUSTERED | NONCLUSTERED ] (column [ ASC | DESC ] [ ,...n ] ) [ WITH FILLFACTOR =fillfactor [ WITH ( <index_option>[ , ...n ] ) ] [ ON { partition_scheme_name (partition_column_name ... ) | filegroup | "defau...
1.语法:ALTER TABLE 表名 ADD CONSTRAINT 主键名 PRIMARY KEY 表名(主键字段); 3.添加外键 1.语法:ALTER TABLE 表名 ADD CONNSTRAINT 外键名 FOREIGN KEY(外键字段) REFERENCES 关联表名(关联字段); 4.插入单(多)条数据记录(和SQL Server相同,但是不能用select多列添加数据) 1.INSERT INTO 表名[(字段名...
A key definition includes the Unique property that you can use to create a unique constraint on the table in SQL Server. A unique key ensures that records in a table don't have identical field values. With a unique key, when table is validated, the key value is checked for uniqueness. ...
TableTypePrimaryKeyConstraint 屬性 C# 閱讀英文 新增至集合 新增至計劃 共用方式為 Facebookx.comLinkedIn電子郵件 列印 Reference Feedback Definition Namespace: Microsoft.SqlServer.Dac.Model Assembly: Microsoft.SqlServer.Dac.Extensions.dll Package: Microsoft.SqlServer.DacFx v162.2.111 ...
CREATE TABLE dbo.Globally_Unique_Data (guid uniqueidentifier CONSTRAINT Guid_Default DEFAULT NEWSEQUENTIALID() ROWGUIDCOL, Employee_Name varchar(60) CONSTRAINT Guid_PK PRIMARY KEY (guid) ); J. Verwenden eines Ausdrucks für eine berechnete Spalte ...
ADD table_constraint [ NOT VALID ] 给表增加一个新的约束。 ADD table_constraint_using_index 根据已有唯一索引为表增加主键约束或唯一约束。 VALIDATE CONSTRAINT constraint_name 验证一个外键或是一个使用NOT VALID选项创建的检查类约束,通过扫描全表来保证所有记录都符合约束条件。如果约束已标记为有效时,什么...
For example, if a stored procedure creates a temporary table with a named primary key constraint, the stored procedure cannot be executed simultaneously by multiple users. Many uses of temporary tables can be replaced with variables that have the table data type. For more information about using ...
1.4、约束(constraint) ——可参考《SQL必知必会(第5版)》之《22.1 约束(constraint)》章节 1.4.1 主键(PRIMARY KEY) PRIMARY KEY的用途: 数据的唯一标识。主键必须是唯一的值。主键不能是NULL值。每个表都应该有一个主键,且只能有一个。 PRIMARY KEY的语法: 创建主键的方法有两种, 一是建表的时候就添加上...
Clustered property class of TableTypePrimaryKeyConstraint 命名空间: Microsoft.SqlServer.Dac.Model 程序集: Microsoft.SqlServer.Dac.Extensions(在 Microsoft.SqlServer.Dac.Extensions.dll 中) 语法 C# 复制 public static ModelPropertyClass Clustered { get; internal set; } 属性值 类型:Microsoft.SqlServer.Dac...