Option 1:select table → right click → Design → Relationships icon in toolbarorright click and choose Relationships → select key in Selected Relationship list on the left When you select the right key on the left expandTables And Columns Specificationoption in the right panel. There are 4 ...
To avoid this error, you have to first create the PRIMARY KEY constraint in the table to be referenced in a FOREIGN KEY constraint. ALTER TABLE [dbo].[Department] ADD CONSTRAINT [PK_Department] PRIMARY KEY ( [DepartmentID] ) GO ALTER TABLE [dbo].[Employee] ADD CONSTRAINT [FK_Employee_De...
在这个示例中,我们首先创建两个表:Customers和Orders。 -- 创建 Customers 表CREATETABLECustomers(CustomerIDINTPRIMARYKEY,-- 主键CustomerName NVARCHAR(100),-- 客户名称ContactEmail NVARCHAR(100)-- 联系邮箱);-- 创建 Orders 表CREATETABLEOrders(OrderIDINTPRIMARYKEY,-- 主键OrderDateDATETIME,-- 订单日期Custo...
and have to create FOREIGN KEY in users table to link to the department table SQL statement : CREATE TABLEDEPARTMENTS( department_idSMALLINTNOT NULLPRIMARY KEY, department_nameVARCHAR(50), ) And the users table will be like this: SQL statement is: CREATE TABLEUSERS( user_idSMALLINTNOT NULLP...
To add a foreign key, click the last row in theForeign Key Namelist. Enter a name for the foreign key and select the column or columns that you wish to index by checking the column name in theColumnlist. You can remove a column from the index by removing the check mark from the appr...
消息 547，级别 16，状态 1，服务器 HOME-BED592453C\SQLEXPRESS，第 1 行 DELETE 语句与 REFERENCE 约束"main_id_cons"冲突。该冲突发生于数据库"Stock"，表"db o.test_sub", column 'main_id'。语句已终止。产生这类信息的原因是，你创建了默认的外键约束。默认的就是，为了保证数据的完整性...
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
SQL FOREIGN KEY on CREATE TABLE 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), ...
百度试题 题目在SQL中使用FOREIGNKEY时,与之配合的语句是() A.EXISTSB.EXCEPTC.TABLED.REFERENCES相关知识点: 试题来源: 解析 D 反馈 收藏
#defineTAB_LEN SQL_MAX_TABLE_NAME_LEN + 1#defineCOL_LEN SQL_MAX_COLUMN_NAME_LEN + 1LPSTR szTable;/* Table to display */UCHAR szPkTable[TAB_LEN];/* Primary key table name */UCHAR szFkTable[TAB_LEN];/* Foreign key table name */UCHAR szPkCol[COL_LEN];/* Primary key column */...