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CREATE TABLE t (c int); INSERT INTO t VALUES (NULL) , (1) , (2) ; TABLE t;
CREATE TABLE
INSERT 0 3
c
null
1
2
SELECT 3
ALTER TABLE t ALTER COLUMN c TYPE int USING (COALESCE(c, 0)) , ALTER COLUMN c SET DEFAULT 0 , ALTER COLUMN c SET NOT NULL; TABLE t;
ALTER TABLE
c
0
1
2
SELECT 3