Insert within select

hi,
i want to insert a row in project table with fieldd
ProjId , desc, lastdate, userid from same table by passing the projectId
I mean I want to create a duplicate row in the same table with different projectid (that max of projId in that table) and insert into the same table.
Any help is appreaciated
Regards
infyniti

Since I do not know the relation between project and projectDetails, I am going to provide 3 examples
-- Assuming that you have only 1 records in projectDetails.
INSERT INTO project_tbl
(lastdate, userid, proj_id, DESC)
SELECT proj.lastdate
,proj.userid
,(SELECT MAX(proj_id)+1 FROM project) projId
,(SELECT projdetails.DESC||'SOMETHING' FROM ProjectDetails projdetails) DESC
FROM project proj
WHERE proj.proj_id = 1234
-- Getting information from projectDetails
INSERT INTO project_tbl
(lastdate, userid, proj_id, DESC)
SELECT projdetails.lastdate
,projdetails.userid
,(SELECT MAX(proj_id)+1 FROM project) projId
,projdetails.DESC||'SOMETHING' DESC
FROM ProjectDetails projdetails
WHERE projdetails.proj_id = 1234
-- Getting information from project and projectDetails
INSERT INTO project_tbl
(lastdate, userid, proj_id, DESC)
SELECT proj.lastdate
,proj.userid
,(SELECT MAX(proj_id)+1 FROM project) projId
,projdetails.DESC||'SOMETHING' DESC
FROM project proj
,ProjectDetails projdetails
WHERE proj.proj_id = projdetails.proj_id
AND proj.proj_id = 1234

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Hi I've the following INSERT into SELECT statement .
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If its empty then you can drop it and create it as
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How can i achieve this ..
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