如果 DML 语句包含一个没有 INTO 子句的 OUTPUT 子句，则该语句不能有任何启用的触发器

Question

I have been unsuccessfully trawling StackOverflow and other sites to solve my error so time to post and see if someone can tell me where I'm going wrong.

My system has a PowerApp with a simple form. On saving the form, the fields are written to table1. I then want to create a trigger on table1 so that one field from each new record is inserted into table2.

Despite there being no output clause in my code, I am getting the following error:

The requested operation is invalid. Server Response: Microsoft SQL: The target table 'table1' of the DML statement cannot have any enabled triggers if the statement contains an OUTPUT clause without INTO clause. inner exception: Microsoft SQL: The target table 'table1' of the DML statement cannot have any enabled triggers if the statement contains an OUTPUT clause without INTO clause.

Stripping my code back to the following still throws the same error:

ALTER TRIGGER [dbo].[FormatID] 
   ON  [dbo].[table1]
   AFTER INSERT
AS 
BEGIN

    INSERT INTO [dbo].[table2](origID) 
    VALUES (1)

END

Any suggestions please fire away, I feel as though I am missing something obvious...

Answer 1

your application is OUTPUT-ing inserted/deleted values of a dml statement as a resultset. This is not possible when there are triggers on the table (target of the dml)

create table dbo.table1(id int);
create table dbo.table2(origID int);
go

CREATE OR ALTER TRIGGER [dbo].[FormatID] 
   ON  [dbo].[table1]
   AFTER INSERT
AS 
BEGIN

    INSERT INTO [dbo].[table2](origID) 
    VALUES (1)

END;


--succeeds
insert into dbo.table1(id) 
values (1);
go

--fails
insert into dbo.table1(id) 
output inserted.id --output cannot be a resultset(in the void) because there is a trigger
values(1);

--succeeds
declare @outputtable table (id int);
insert into dbo.table1(id) 
output inserted.id into @outputtable(id)--output into a table
values(1);