Postgres โต๊ะปรับปรุงทุกโพรโทคอล aimcomment ค่า

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postegresql ปรับปรุงให้โพรโทคอล aimcomment

UPDATE table1 
SET column_a = NULL
WHERE column_b = 'XXX';
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postgresql เปลี่ยนแปลงคอลัมน์ nullable

-- To change a column to nullable
ALTER TABLE mytable ALTER COLUMN mycolumn DROP NOT NULL;

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