SQL查询以查找不存在主键的位置

SELECT column_name
FROM table_name
WHERE column_name NOT IN (SELECT primary_key_column FROM table_name);

SELECT t1.column_name
FROM table_name t1
LEFT JOIN (SELECT primary_key_column FROM table_name) t2
ON t1.column_name = t2.primary_key_column
WHERE t2.primary_key_column IS NULL;

SELECT column_name
FROM table_name t1
WHERE NOT EXISTS (SELECT 1 FROM table_name t2 WHERE t1.column_name = t2.primary_key_column);