Re: Parent Categories Hierarchy Nilesh Sane October 18, 2004 04:17AM Sorry, you can't reply to this topic. It has been closed. Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the...
When we need depth information for a sub-tree, we cannot limit either the node or parent tables in our self-join because it will corrupt our results. Instead, we add a third self-join, along with a sub-query to determine the depth that will be the new starting point for our sub-tree...
通过ON子句指定了连接条件为e1.parent_id = e2.id,即员工的parent_id等于其上级员工的id。 代码示例 接下来,我们通过一个简单的代码示例来演示如何在MySQL中查询自己和父亲的数据。 CREATETABLEemployee(idINTPRIMARYKEY,nameVARCHAR(50),parent_idINT);INSERTINTOemployee(id,name,parent_id)VALUES(1,'Alice',NU...
Parent : net::tls::TlsStream< LowerLayer > parent : opt_explain_json_namespace::context, Opt_hints, Pointer_vector< T >, Priority_queue< T, Container, Less, Marker >, purge_node_t, que_common_t, Query_term, Rewriter_alter_server, Rewriter_alter_user, Rewriter_create_server, Rewriter...
$result = mysql_query("SELECT * FROM category WHERE parent_id='$category_id'"); // display each child while ($row = mysql_fetch_array($result)) { // indent and display the title of this child // if you want to save the hierarchy, replace the following line with your code ...
For example, if an event executes an INSERT statement, execution of the event itself is the parent, instrumented using statement/scheduler/event, and the INSERT is the child, instrumented using statement/sql/insert. The parent/child relationship holds between separate instrumented operations. This ...
parent class 父类 parentheses[pəˈrenθɪsɪsiz] 圆括弧、圆括号 parse [pɑ:z]解析 parser ['pɑ:sə]解析器 part 零件、部件 partial specialization 局部特化 pass by address 传址(函式引数的传递方式)(非正式用语) pass by reference 传地址、按引用传递 ...
为具体的员工ID UNION ALL -- 递归部分 SELECT e.id, e.name, e.manager_id FROM employees e INNER JOIN employee_hierarchy eh ON e.id = eh.manager_id ) SELECT * FROM employee_hierarchy; 可能遇到的问题及解决方法 问题:递归查询进入无限循环。 原因:递归查询没有正确的终止条件,或者终止条件设置不...
context.Items.AddRange(newEntities); // if newEntities is parent list it can have child sublists context.BulkSaveChanges();Practical general usage could be made in a way to override regular SaveChanges and if any list of Modified entities entries is greater then say 1000 to redirect to Bulk...
Your table2 is an edges table, each row defining a child-parent relationship in a directed graph. But it has no PK either, nor any evident rule ensuring it is a correct single tree; presumably those rules are also enforced in application code. ...