首先创建测试表 usetest;createtabletest01 ( id1intnotnull, id2intnotnull);createtabletest02 ( id11intnotnull, id22intnotnull);altertabletest01addconstraintpk_id1primarykey(id1); 考虑如下关系 test02表中的id11依赖于test01中的id1,因此为test02创建外键 altertabletest02addconstraintfk_id11foreign...
CONSTRAINT fk_PerOrders FOREIGN KEY (P_Id) REFERENCES Persons(P_Id) ) (2)ALTER TABLE 时的 SQL FOREIGN KEY 约束 ALTER TABLE Orders ADD FOREIGN KEY (P_Id) REFERENCES Persons(P_Id) 如需命名 FOREIGN KEY 约束,并定义多个列的 FOREIGN KEY 约束,请使用下面的 SQL 语法: ALTER TABLE Orders ADD ...
I get an error when trying to create `sp-neu`.`bestellpositionen` like this (excerpt from 'show engine innodb status'): --- LATEST FOREIGN KEY ERROR --- 090925 9:36:47 Error in foreign key constraint of table sp@002dneu/bestellpositionen: FOREIGN KEY (`warenkoerbe_id` , `artikelnu...
CreateApplicationRoleStatement CreateAssemblyStatement CreateAsymmetricKeyStatement CreateAvailabilityGroupStatement CreateBrokerPriorityStatement CreateCertificateStatement CreateColumnEncryptionKeyStatement CreateColumnMasterKeyStatement CreateColumnStoreIndexStatement
Class(ClassIdchar(8)NOTNULL,ClassNamevarchar(30)NOTNULL,DeptIdchar(2)NOTNULL,ClassStuNumberint,CONSTRAINTPK_ClassIdPRIMARYKEY(ClassId,ClassName))2020/3/1 ---江阴职业技术学院计算机系--- MicrosoftSQLServer2005 4
When you create a primary key, SQL Server enforces the constraint behind the scenes by creating a unique index on that column and using the primary key column or columns as the keys of the index. 当你创建一个主键时,SQL Server强制在幕后对这个列创建唯一性索引,并使用主键列作为索引的键。
CheckConstraintDefinition CheckpointStatement ChildObjectName ClassifierEndTimeOption ClassifierImportanceOption ClassifierMemberNameOption ClassifierStartTimeOption ClassifierWlmContextOption ClassifierWlmLabelOption ClassifierWorkloadGroupOption CloseCursorStatement CloseMasterKeyStatement CloseSymmetricKeyStatement CoalesceExpress...
Feature FOREIGN KEY Applies to: Azure SQL Database and SQL Server starting SQL Server 2016 (13.x)For memory-optimized tables, FOREIGN KEY constraints are only supported for foreign keys referencing primary keys of other memory-optimized tables. Remove the constraint from the table definition if th...
Feature FOREIGN KEY Applies to: Azure SQL Database and SQL Server starting SQL Server 2016 (13.x)For memory-optimized tables, FOREIGN KEY constraints are only supported for foreign keys referencing primary keys of other memory-optimized tables. Remove the constraint from the table definition if th...
"Can't create table .\test\#sql-140_1.frm'" I did a few more experiments and the following commands work: ALTER TABLE `test`.`testing` ADD CONSTRAINT `FK_testing_1` FOREIGN KEY `FK_testing_1` (`ID`) REFERENCES `reftable` (`ID`) ON DELETE RESTRICT ON UPDATE RESTRICT ,...