我一直在努力研究如何让我的select声明发挥作用。
ORA-01427 single-row subquery returns more than one row语句似乎按预期工作，但当我尝试更新列值时，出现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))
错误。
以下是代码：
tbl_metrics.act_end_time我们的想法是使用entry_timestamp表中activity和activity.caseid=tbl_metrics.caseid以及activity.entry_timestamp>tbl_metrics.act_start_time的最低activity.act_id值更新tree_node *insert_node_in_tree(tree_node *root, node new_node) {
if(root == NULL)
return new_node;
queue <tree_node * > qu;
tree_node *temp;
qu.push(root);
while(!(qu.empty())) {
temp = qu.front();
qu.pop();
if(temp->left == NULL || temp->right == NULL)
break;
qu.push(temp->left);
qu.push(temp->right);
}
if(temp->left == NULL)
temp->left = new_node;
else
temp->right = new_node;
return root;
}
列}是100,700或300。
答案 0 :(得分：1)
我认为应该是这样的：
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)