Re: [SQL] idiom to move records?

At 7:31 +0200 on 26/10/98, Leslie Mikesell wrote:


> Is there a handy way to move a set of records to a different
> table in sql?  I'd like to do this based on a WHERE clause
> and have it work atomically such that it will not lose new
> records added between the step that copies to the other table
> and deleting the copied records.

Do it in a transaction, then. Assuming that the target table is defined
(not a temporary table you create ad-hoc), you do:

BEGIN TRANSACTION;

LOCK TABLE source_table;

INSERT INTO target_table (col1, col2, col3)
SELECT (expr1, expr2, expr3)
FROM source_table
WHERE <where condition here>;

DELETE FROM source_table
WHERE <where condition here>;

COMMIT;



Herouth

--
Herouth Maoz, Internet developer.
Open University of Israel - Telem project
http://telem.openu.ac.il/~herutma