Question

我在oracle中有以下查询。我想将其转换为PostgreSQL表单。有人可以帮我解决这个问题，

SELECT user_id, user_name, reports_to, position 
FROM   pr_operators
START WITH reports_to = 'dpercival'
CONNECT BY PRIOR user_id = reports_to;

Answer 1

这样的事情应该适合你（SQL Fiddle）：

WITH RECURSIVE q AS (
    SELECT po.user_id,po.user_name,po.reports_to,po.position
      FROM pr_operators po
     WHERE po.reports_to = 'dpercival'
    UNION ALL
    SELECT po.user_id,po.user_name,po.reports_to,po.position
      FROM pr_operators po
      JOIN q ON q.user_id=po.reports_to
)
SELECT * FROM q;

你可以read more on recursive CTE's in the docs。

注意：您的设计看起来很奇怪 - reports_to包含字符串文字，但它与user_id一致，典型的类型为integer。< / p>

PostgreSQL - 在oracle中使用“start with”和“connect by”迁移查询

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