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postgresql change column to not null

-- To change a column to NOT NULL:
ALTER TABLE products ALTER COLUMN product_no SET NOT NULL;
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postgresql alter column nullable

-- To change a column to nullable
ALTER TABLE mytable ALTER COLUMN mycolumn DROP NOT NULL;
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alter column set not null to null postgres

ALTER TABLE person ALTER COLUMN phone DROP NOT NULL;
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change from not null postgresql

ALTER TABLE table_name ALTER COLUMN column_name DROP NOT NULL;
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