Oracle SQL 使用 having 子句删除 table 条目

Question

我有一个 SQL 查询，它根据上次登录日期 table 查找用户标识

select USER_ID, max(login_time) maxd from MyTable group by User_Id having max(login_time) < (sysdate - 90)

我需要删除此查询找到的条目

我试过了

DELETE a
FROM   MyTable a
JOIN
(
    select USER_ID, max(login_time) maxd from MyTable group by User_Id having max(login_time) < (sysdate - 90)
) b ON a.USER_ID = b.USER_ID

但这导致 SQL 错误：ORA-00933：SQL 命令未正确结束

有人能帮忙吗？

Answer 1

使用您的 select 作为子查询：

DELETE FROM MyTable
  WHERE (user_id, login_time) IN
           -- this is your query:
           (  SELECT USER_ID, MAX (login_time) maxd
                FROM MyTable
            GROUP BY User_Id
              HAVING MAX (login_time) < (SYSDATE - 90));

Answer 2

Oracle 支持 delete join 语法，但与其他数据库有点不同。

DELETE FROM (
    SELECT a.*
    FROM MyTable a
    INNER JOIN
    (
        SELECT USER_ID
        FROM MyTable
        GROUP BY User_Id
        HAVING MAX(login_time) < (sysdate - 90)
    ) b ON a.USER_ID = b.USER_ID
);

Answer 3

您可以关联 ROWID 伪列并使用分析函数：

DELETE FROM mytable
WHERE ROWID IN (
  SELECT ROWID
  FROM   (
    SELECT login_time,
           MAX(login_time) OVER (PARTITION BY user_id) AS max_login_time
    FROM   mytable
  )
  WHERE  max_login_time < SYSDATE - INTERVAL '90' DAY
  AND    login_time = max_login_time
)

Oracle SQL 使用 having 子句删除 table 条目

Oracle SQL to delete table entries using having clause

sql

oracle

having