The CREATE TABLE Statement is used to create tables to store data. Integrity Constraints like primary key, unique key, foreign key can be defined for the columns while creating the table. The integrity constraints can be defined at column level or table level. The implementation and the syntax...
Oracle PL/SQL:CREATE TABLE statement: create a table with primary key.CREATE TABLE statement can be used to create table objects in database. It is possible to add constraints like primary key ,foreign key while table creation.Primary key is the unique identifier for a row of data.One ...
【摘要】 下面的 SQL 在 "Orders" 表创建时在 "P_Id" 列上创建 FOREIGN KEY 约束:MySQL:CREATE TABLE Orders(O_Id int NOT NULL,OrderNo int NOT NULL,P_Id int,PRIMARY KEY (O_Id),FOREIGN KEY (P_Id) REFERENCES Persons(P_Id))SQL Serv... 下面的 SQL 在 "Orders" 表创建时在 "P_Id" 列...
1.3:Creating aTable with aForeign Key Reference In this recipe, I’ll demonstrate how to create atable with aforeign key. In this example, aforeign key reference is included in a CREATE TABLE statement: CREATETABLEPerson.EmployeeCreditRating( EmployeeCreditRatingintNOTNULLPRIMARYKEY, EmployeeIDint...
SQL定义功能中,用CREATE TABLE建立表时,FOREIGN KEY...REFERENCES…短语的含义是A.说明主关键字B.建立表之间的联系C.说明有效性规则
The following SQL creates aFOREIGN KEYon the "PersonID" column when the "Orders" table is created: MySQL: CREATETABLEOrders ( OrderID intNOTNULL, OrderNumber intNOTNULL, PersonID int, PRIMARYKEY(OrderID), FOREIGNKEY(PersonID)REFERENCESPersons(PersonID) ...
{ PRIMARY KEY | UNIQUE } [ CLUSTERED | NONCLUSTERED ] [ WITH FILLFACTOR = fillfactor | WITH ( <index_option> [ ,... n ] ) ] [ ON { partition_scheme_name ( partition_column_name ) | filegroup | "default" } ] | [ FOREIGN KEY ] REFERENCES referenced_table_name [ ( ref_column ...
The CREATE TABLE statement defines a table. The definition must include its name and the names and attributes of its columns. The definition can include other attributes of the table, such as its primary key and its table space. Invocation for CREATE TABLE This statement can be embedded in ...
用SQL语句创建表,使用语句 CREATE TABLE对列的约束主要有 NOT NULL,UNIQUE,PRIMARY KEY, FOREIGN KEY等。定义表的删除与
可以使用SQL语句CREATE VIEW创建视图,其语法格式为: CREATE VIEW view_name [ (column [ ,...n ] ) ][ WITH < view_attribute> [ ,...n ] ]AS select_statement[ WITH CHECK OPTION ] [ ; ]< view_attribute> ::={[ ENCRYPTION ][ SCHEMABINDING ][ VIEW_METADATA ] } 各主要参数说明如下。 (...