基于具有多列的Select语句插入语句

Question

I need to create a static "copy" of values from one table and store them in another.

The best way I know how to do this is to get the values from the db to my application, loop through them and concatenate multiple INSERT statements, then execute the query.

Is there a way to do this without the round trip between application and database?

I was hoping something like this would work:

INSERT INTO dbo.StudentProject 
VALUES (SELECT StudentID, ProjectID 
        FROM dbo.StudentProjectSimulation
        WHERE SimulationID = 1)

but it doesn't.

(everything is an int so no worries there)

Answer 1

You're very close:

INSERT INTO dbo.StudentProject 
SELECT StudentID, ProjectID 
FROM dbo.StudentProjectSimulation
WHERE SimulationID = 1

Answer 2

Just drop values from the insert into clause.

Insert Into dbo.StudentProject 
Select StudentID, ProjectID  
From dbo.StudentProjectSimulation 
Where SimulationID = 1;

Answer 3

Alternatively to explicitly define the columns to insert into use the following where you substitute Student_Col and ProjectID_Col for appropriate column names in dbo.StudentProject

Insert Into dbo.StudentProject 
  (
    Student_Col,
    ProjectID_Col
  )
Select 
  StudentID, 
  ProjectID 
From dbo.StudentProjectSimulation 
Where SimulationID = 1