数组中的 PostgreSQL 整数不可合并连接

Question

我想在整数数组中的整数条件下执行 FULL OUTER JOIN。

查询看起来像这样：

SELECT thing FROM table1 t1
FULL OUTER JOIN table2 t2
ON t1.id = ANY(t2.array_of_ids)

但是我得到以下错误：

FULL JOIN is only supported with merge-joinable or hash-joinable join conditions

有没有办法使这个条件可合并连接？

Answer 1

嗯。 . .是这样的吗？

SELECT thing
FROM table1 t1 FULL OUTER JOIN
     (table2 t2 CROSS JOIN
      UNNEST(t2.array_of_ids) t2_id
     )
     ON t1.id = t2_id;

问题在于它会成倍增加行数。那么，构建 FULL JOIN 怎么样？

SELECT . . .
FROM table1 t1 LEFT JOIN
     (table2 t2 CROSS JOIN
      UNNEST(t2.array_of_ids) t2_id
     )
     ON t1.id = t2_id
UNION ALL
SELECT . . .
FROM table2 t2
WHERE NOT EXISTS (SELECT 1
                  FROM UNNEST(t2.array_of_ids) t2_id JOIN
                       table1 t1
                  ON t2_id = t1.id
                 );

数组中的 PostgreSQL 整数不可合并连接

PostgreSQL Integer in Array is not merge-joinable

sql

arrays

postgresql

outer-join