WITH RECURSIVE cte AS ( SELECT parent_id, child_id FROM parent_child WHERE child_id = {输入的子节点id} UNION ALL SELECT pc.parent_id, pc.child_id FROM cte JOIN parent_child pc ON cte.parent_id = pc.child_id ) SELECT DISTINCT parent_id FROM cte; 1. 2. 3. 4. 5. 6. 7. 8....
"query": { "has_parent" : { "parent_type" : "question", "query" : { "match" : { "text" : "This is" } } } } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 6. 根据子文档查找父文档 GET my_join_index/_search { "query": { "has_child" : { "type" : "...
父子关系模型(Parent-Child Model):通过为每个节点记录其父节点ID的方式来表示树形结构。可以使用递归查询或者使用自连接查询实现树形结构的查询和操作。这种模型适合查询层级较浅的树形结构,写操作相对简单。 路径枚举模型(Path Enumeration Model):通过为每个节点记录其完整路径的方式来表示树形结构,路径可以使用特定的分隔...
I'm trying to get all child nodes for one parent node in my gallery. The gallery has 2 main tables, one for the pictures and one for the categories. Each picture is in one category, and each category is either a child (or a child of a child... or deeper) or a parent. ...
getAreaChildBottomUp (113) ); 显示结果: 也可以直接使用SQL语句: SELECT area_id, area_name, area_code, pid FROM ( SELECT @r AS _id, ( SELECT @r :=pid FROM tb_area WHERE area_id=_id ) AS parent_id, @l := @l + 1AS lvl ...
RECURSIVE child_tree AS ( -- 初始查询:选择目标节点 SELECT id, parent_id FROM your_table WHERE parent_id = your_target_parent_id UNION ALL -- 递归查询:选择子节点 SELECT t.id, t.parent_id FROM your_table t INNER JOIN child_tree ct ON t.parent_id = ct.id ) SELECT * FROM child_...
Query OK, 1 row affected (0.01 sec) 3 mysql> select * from dage; 4 +---+---+ 5 | id | name | 6 +---+---+ 7 | 1 | 铜锣湾 | 8 +---+---+ 9 1 row in set (0.00 sec) 插入个小弟: 1 mysql> insert into xiaodi...
LEFT JOIN tdb_goods_types AS s ON s.parent_id = p.type_id GROUP BY p.type_name ORDER BY p.type_id ) AS t2 ON t1.type_id = t2.type_id SET t1.child_count = t2.children_count; -- 查找重复记录 SELECT goods_id,goods_name FROM tdb_goods GROUP BY goods_name HAVING count(goods...
{ Item_exists_subselect **subq, **subq_begin= sj_candidates->begin(), **subq_end= sj_candidates->end(); for (subq= subq_begin; subq < subq_end; subq++) { table_count+= tables_added; // In WHERE/ON of parent query, replace IN(subq) with "1" (<=>TRUE) Item **...
THREAD_ID AND parent.EVENT_ID < child.EVENT_ID AND ( child.EVENT_ID <= parent.END_EVENT_ID OR parent.END_EVENT_ID IS NULL ); The query for session B should show statement [2] as owning a data lock on the record with pk=1. ...