如何使用最后插入的ID将行插入另一个表？

Question

I'm having two table on my SQL server GamerName and GamerValues , I want that, when I insert a new row on GamerName

 GamerName

    ╔════╦═════════╦
    ║ ID ║  Name   ║
    ╠════╬═════════╬
    ║  1 ║ Jeff    ║
    ║  2 ║ Geoff   ║
    ║  3 ║ Jarrod  ║
    ║  4 ║ Joel Sp ║
    ╚════╩═════════╩

So, with the last inserted ID on the table GamerName , the values should be filled on GamerValues

 GamerValues

╔════╦══════════════╦════════╗
║ ID ║  GamerID     ║ Score  ║
╠════╬══════════════╬════════╣
║  1 ║ 1            ║ 5636   ║
║  2 ║ 2            ║  148   ║
║  3 ║ 3            ║  101   ║
║  4 ║ 4            ║  959   ║
╚════╩══════════════╩════════╝

Is it possible to do it with a single query?

Answer 1

You should manage this with a stored procedure. You can concentrate any additional logic you need when creating a new gamer this way (for example, checking if already exists).

CREATE PROCEDURE dbo.CreateGamer
    @Name VARCHAR(100)
AS
BEGIN

    IF EXISTS (SELECT 'gamer name already exists' FROM GamerName AS G WHERE G.Name = @Name)
    BEGIN

        RAISERROR('Gamer name already used!', 16, 1)
        RETURN

    END

    INSERT INTO GamerName (
        Name)
    VALUES
        (@Name)

    DECLARE @GamerID INT = SCOPE_IDENTITY()

    INSERT INTO GamerValues (
        GamerID,
        Score)
    SELECT
        GamerID = @GamerID,
        Score = 0

END

You can ensure the uniqueness of the gamer name with a UNIQUE constraint, I'm just using the EXISTS to show how you can put additional logic in your SP.

Answer 2

You don't need a trigger or any of the @@IDENTITY , SCOPE_IDENTITY() functions. All of them have restrictions and none of them can deal with values that aren't produced by an IDENTITY constraint. None of them can deal with multiple insertions either.

You can use the OUTPUT clause of INSERT to copy newly inserted values into another table or a table variable.

OUTPUT is also available for UPDATE and DELETE. You can retrieve the new/modified columns with the inserted. and deleted. prefixes

For these tables :

create table #GamerName 
(
    ID int IDENTITY primary key, 
    Name nvarchar(20) not null
);
create table #GamerValues(
    ID int IDENTITY primary key,
    GamerID int not null,
    Score int not null
);

You can insert new records in #GamerName and copy the generated ID to #GamerValues with :

INSERT INTO #GamerName (Name)
OUTPUT inserted.ID,0 into #GamerValues(GamerID,Score)
VALUES 
('Jeff'),
('Geoff'),
('Jarrod'),

New values appear in the inserted virtual table. OUTPUT is also availa

A new line will be created for each of the gamers in GamerValues. Let's modify the default score with :

UPDATE #GamerValues 
SET Score=100

The table will look like :

ID  GamerID Score
1   1       100
2   2       100
3   3       100

Adding another gamer with

insert into #GamerName (Name)
output inserted.ID,0 into #GamerValues(GamerID,Score)
Values 
('Joel sp')

Will result in a new line with a Score of 0

ID  GamerID Score
1   1       100
2   2       100
3   3       100
4   4       0

Answer 3

You have to add a trigger to this for you.

CREATE TRIGGER newTrigger ON GamerName
FOR INSERT
AS

INSERT INTO GamerValues
        (GamerID)
    SELECT
        'ID'
        FROM inserted

GO

Btw the score variable should be set 0 by default since you don't have a value when a new user is created. Unless if you do.

Hope this helps

Answer 4

If you have an identity column in Gamername Table you can use

INSERT INTO GamerName (Name)VALUES
('Joel Sp');


INSERT INTO GamerValues (GamerID,Score)
    SELECT SCOPE_IDENTITY() ,0 score;

If you just need the last column inserted and assuming the gamer id in gamername table are sequential then you can simply use

INSERT INTO GamerValues (GamerID,Score)
select max(id),0 score from gamername;

If Nothing Satisfies your condition then TRIGGER is the best Option