使用APPLY UPDATE some_table SET some_row = another_row, some_row2 = another_row/2 FROM some_table st CROSS APPLY (SELECT TOP 1 another_row FROM another_table at WHERE at.shared_id=st.shared_id) WHERE ... Run Code Online (Sandbox Code Playgroud) 在更新语句中使用交叉应用归档...
CREATE TABLE [Person]( [Id] [int] PRIMARY KEY, [Name] [varchar](100) NOT NULL, [Email] [varchar](100) NOT NULL, [GenderID] [int] CONSTRAINT FK_Person_GenderID FOREIGN KEY REFERENCES dbo.Gender(Id) ON DELETE CASCADE ON UPDATE CASCADE ) ...
ALTERTABLEdbo.OrdersADDCONSTRAINTFK_Orders_EmployeesFOREIGNKEY(empid)REFERENCESdbo.Employees(empid);--同一表中的外键,修改表dbo.Employees,定义外键约束mgrid,指向表Employees中的empid列,主键列ALTERTABLEdbo.EmployeesADDCONSTRAINTFK_Employees_EmployeesFOREIGNKEY(mgrid)REFERENCESEmployees(empid); 注:即使被引用的候选键...
「Clone Table in another schema」と入力して、クエリの名前を変更します。 キーボードの Enter キーを押すか、タブの外側の任意の場所を選択して変更を保存します。 次のステップ チュートリアル: ストアド プロシージャを使用してデータを変換する 関連するコンテンツ Microsoft Fabric で...
UPDATE SomeTable SET SomeColumn = SomeValue WHERE SomeCondition = 'Condition'; -- Second operation INSERT INTO AnotherTable VALUES ('Data'); -- If all operations succeed, exit RETURN; END TRY BEGIN CATCH -- Increment retry count SET @RetryCount = @RetryCount + 1; -- Log the error SET...
如果有两个 WHEN MATCHED 子句,一个必须指定 UPDATE 操作,另一个必须指定 DELETE 操作。 如果在 <merge_matched> 子句中指定了 UPDATE,并且根据 <merge_search_condition> <table_source> 中有多行与 target_table 中的一行匹配, SQL Server 便会返回错误。 MERGE 语句无法多次更新同一行,也无法更新和删除同...
LEFT JOIN − Returns all rows from the left table, even if there are no matches in the right table. RIGHT JOIN − Returns all rows from the right table, even if there are no matches in the left table. FULL JOIN − Returns rows when there is a match in one of the tables. SEL...
You can manage additional logic such as deleting rows from the target that don’t appear in the source. For simple, straightforward updates of data in one table based on data in another, it is typically more efficient to use simple INSERT, DELETE, and UPDATE s...
Executesp_removedbreplicationin the appropriate database, or, if the execution is in the context of another database on the same instance, specify the database where the replication objects should be removed. This procedure doesn't remove objects from other databases, such as the d...
EXECUTE format('UPDATE employees SET salary = salary + $1 WHERE %I = $2', col_name) USING amount, col_val; Run DDL EXECUTE ('CREATE TABLE link_emp (idemp1 integer, idemp2 integer);'); EXECUTE 'CREATE TABLE link_emp (idemp1 integer, idemp2 integer)'...