使用Transact-SQL 对INSERT 和 UPDATE 语句禁用外键约束 在“对象资源管理器”中,连接到 数据库引擎的实例。 在标准栏上,选择“新建查询” 。 将以下示例复制并粘贴到查询窗口中,然后选择“执行”。 SQL USEAdventureWorks2022; GOALTERTABLEPurchasing.PurchaseOrderHeaderNOCHECK...
使用Transact-SQL 若要停用 INSERT 和 UPDATE 陳述式的檢查條件約束 在物件總管中,連線到資料庫引擎的一個執行個體。 在標準列上,按一下[新增查詢]。 將下列範例複製並貼入查詢視窗中,然後按一下[執行]。 SQL USEAdventureWorks2022; GOALTERTABLEPurchasing.PurchaseOrderHeaderNOCHECKCONSTRAINTCK...
performanceINT(11)DEFAULTNULL, salaryFLOATDEFAULTNULL,PRIMARYKEY (emp_id),CONSTRAINTfk_performanceFOREIGNKEY (performance)REFERENCESmerits (performance) );-- insert data for merits tableINSERTINTOmerits(performance,percentage)VALUES(1,0), (2,0.01), (3,0.03), (4,0.05), (5,0.08);-- insert data ...
SQL 复制 USE AdventureWorks2022; GO BEGIN TRANSACTION; BEGIN TRY -- Intentionally generate a constraint violation error. UPDATE HumanResources.Department SET Name = N'MyNewName' WHERE DepartmentID BETWEEN 1 AND 2; END TRY BEGIN CATCH SELECT ERROR_NUMBER() AS ErrorNumber ,ERROR_SEVERITY() AS...
constraint user2_fk primary key (firstname,secondname) ); -- 2)初始化 100w条数据 -- 语法: insert into 表名 select语句; -- 2.1) 查询结果 select dbms_random.string('x',20) as firstname, dbms_random.string('x',20) as secondname, ...
SQL Server索引进阶第一篇:索引介绍 SQL Server索引进阶第二篇:深入非聚集索引 SQL Server索引进阶第三篇:聚集索引 SQL Server索引进阶第四篇:页和区 SQL Server索引进阶第五篇:索引包含列 SQL Server索引进阶第六篇:书签 SQL Server索引进阶第七篇:过滤的索引 ...
SQLCODE - 120% msg字符串包括违背唯一性约束的字段和值。 例如<Table 'Sample.MyTable', Constraint 'MYTABLE_UNIQUE3', Field(s) FullName="Molly Bloom"; failed unique check> or <Table 'Sample.MyTable', Constraint 'MYTABLE_PKEY2', Field(s) FullName="Molly Bloom"; failed unique check>。
CONSTRAINT fk_performance FOREIGN KEY (performance) REFERENCES merits (performance) ); -- insert data for merits table INSERT INTO merits(performance,percentage) VALUES(1,0), (2,0.01), (3,0.03), (4,0.05), (5,0.08); -- insert data for employees table ...
If an update to a row violates a constraint or rule, violates the NULL setting for the column, or the new value is an incompatible data type, the statement is canceled, an error is returned, and no records are updated. When an UPDATE statement encounters an arithmetic error (overflow, div...
If an update to a row violates a constraint or rule, violates the NULL setting for the column, or the new value is an incompatible data type, the statement is canceled, an error is returned, and no records are updated. When an UPDATE statement encounters an arithmetic error (overflow, div...