SQL: Assigning sequence numbers

Question

I would like to assign a sequence number as I add a group of rows to a table. How do I do this? I thought about using COUNT() or ROWID but I cannot figure out how.

Let's say I have a table with three columns: PlayListID, TuneID and SequenceNum

I want to create a new tune playlist, so I'm going to add a bunch of TuneID values for a PlayListID of 2 for example. The TuneIDs are ordered by artist, album and track number. Here's what I have at present:

SELECT TuneID From Tunes
WHERE ArtistID=2
ORDER BY AlbumID, TrackNum

I guess what I am trying to do is preserve the ordering information - ensure that when all tunes for PlayListID=2 are retrieved, they have a column that indicates their order. TrackNum cannot be used as their may be a number of albums and I may write another query to retrieve them in some other order as well.

So, how would I modify the below command to add an ascending column (sequence) value for each row inserted?

INSERT INTO Playlist (Name,Seq)
SELECT Name, ??? As Seq FROM Tunes
WHERE ArtistID=2
ORDER BY AlbumID, TrackNum

I'm using SQLite. I don't want to use autoincrement because I'd like the Seq number to be 1 for each PlaylistID.

Answer 1

try thiz：在播放列表中插入INSERT（名称，序列）从调谐中选择名称，行编号，WHERE ArtistID = 2 ORDER BY AlbumID，TrackNum；

Answer 2

The SQL genius at work solved my problem. Here's the solution - creating a temporary table which has an auto incrementing column..

CREATE TEMP TABLE New_Playlist (Seq INTEGER PRIMARY KEY AUTOINCREMENT, TuneID INTEGER);

INSERT INTO New_Playlist (TuneID)
SELECT TuneID FROM Tunes
WHERE ArtistID=2
ORDER BY AlbumID, Track;

INSERT INTO Playlist (TuneID, Name, Seq)
SELECT t.TuneID, t.Name, np.Seq
FROM New_Playlist np JOIN Tunes t ON t.TuneID = np.TuneID;

DROP TABLE New_Playlist;