My table is Points(id,Lg,La) with 50000 rows
I do this SQL request

CREATE TABLE correspondances AS
SELECT reference.id1, toreplace.id
FROM (SELECT MIN(id) AS id1, lg, la FROM points GROUP BY lg, La) AS
reference
INNER JOIN points AS toreplace
ON reference.lg=toreplace.lg AND reference.la=toreplace.la;

The delay of this request is more than 13 minutes.

It's normal ?

My browser is Chrome and I use H2 console.

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