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CREATE TABLE
CREATE INDEX
INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 1
set_id from_id to_id
1 1 10
1 11 15
1 16 20
1 25 30
1 31 40
1 45 50
1 55 60
1 61 80
SELECT 8
UPDATE 4
set_id from_id to_id
1 1 20
1 25 40
1 45 50
1 55 80
SELECT 4