"Single-row subquery returns more than one row" 在 Update 语句中

Question

为了弄清楚如何让我的 update 声明生效，我已经苦苦挣扎了几天。 select 语句似乎按预期工作，但当我尝试更新我的列值时，出现 ORA-01427 single-row subquery returns more than one row 错误。

代码如下：

UPDATE tbl_metrics
SET act_end_time = (WITH base
AS (SELECT caseid, entry_timestamp
       FROM activity
      WHERE act_id IN (100, 700, 300)
      )  
SELECT t1.entry_timestamp
FROM base t1, tbl_metrics t2
WHERE t1.caseid = t2.caseid
AND t2.act_start_time < (SELECT MIN(t1.entry_timestamp) FROM base t1 WHERE t1.caseid = t2.caseid))

想法是 tbl_metrics.act_end_time 列更新为 activity table 中的最低 entry_timestamp 值，其中 activity.caseid=tbl_metrics.caseid 和 activity.entry_timestamp>tbl_metrics.act_start_time activity.act_id 是 100、700 或 300。

Answer 1

我觉得应该是这样的：

UPDATE tbl_metrics t2
SET act_end_time = 
    (SELECT MIN(t1.entry_timestamp) 
    FROM activity t1 
    WHERE act_id IN (100, 700, 300)
        AND t1.entry_timestamp > t2.act_start_time
        AND t1.caseid = t2.caseid)

"Single-row subquery returns more than one row" 在 Update 语句中

"Single-row subquery returns more than one row" in Update statement

oracle

ora-01427

sql-update