SQLite 中带有嵌套 FROM 和 JOIN 的 UPDATE 语句

Question

我目前有一条 SQL 语句：

UPDATE table_1 SET
  property_1=b.value_1,
  property_2=b.value_2,
  property_3=b.value_3
FROM (
  SELECT a.property_4, a.property_5, b.value_2, b.value_3
  FROM (
    SELECT id1 AS property_4, MAX(id2) AS property_5
    FROM table_2
    WHERE
      id1 IN (...) AND
      id2 NOT IN (...)
    ) a
    JOIN table_3 b ON
      a.property_5 = b.id
) a
WHERE
table_1.id = a.property_4

这在我们的生产 postgresql db 上运行良好，但是 UPDATE 的语法在 SQLite 中是不同的（我们在测试中使用的），我发现我自己对如何转换它很困惑。我收到的错误是Error: syntax error near FROM。如果有人是 SQLite 高手，我将不胜感激。

Answer 1

由于 SQLite 不支持带有 JOIN/FROM 子句的 UPDATE。您可以使用CTE & SubQuery 交替进行：

WITH cte AS (
    SELECT a.property_4, b.value_1, b.value_2, b.value_3
    FROM (
    SELECT id1 AS property_4, MAX(id2) AS property_5
    FROM table_2
    WHERE
      id1 IN (...) AND
      id2 NOT IN (...)
    ) a 
    JOIN table_3 b ON
    a.property_5 = b.id    
)

UPDATE table_1 SET
  property_1=(select value_1 from cte where cte.property_4 = id)
  property_2=(select value_2 from cte where cte.property_4 = id)
  property_3=(select value_3 from cte where cte.property_4 = id)
WHERE
id IN (select property_4 from cte)