怎么写 SQL 能查询红色(无子项)排除蓝色(有子项)?
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这个需要用到递归,可能不是这么好理解:
WITH RECURSIVE finish_tree AS ( -- 非递归部分:选择根节点 SELECT id, parent_id FROM blocks WHERE markdown like "* [x]%" UNION ALL -- 递归部分:选择所有子节点 SELECT fi.id, fi.parent_id FROM blocks as fi INNER JOIN finish_tree as ft ON fi.parent_id = ft.id ) select * from blocks where id not in (select id from finish_tree) and root_id = '20240522181405-mdiudfl' and type = 'i' and subtype = 't' limit 10
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这确实写的出来,但是提醒一下,太多子查询很慢的:
with RECURSIVE finish_tree AS ( -- 非递归部分:选择根分类 SELECT id, parent_id FROM blocks WHERE markdown like "* [x]%" and type = 'i' and subtype = 't' UNION ALL -- 递归部分:选择所有子分类 SELECT fi.id, fi.parent_id FROM blocks as fi INNER JOIN finish_tree as ft ON fi.parent_id = ft.id ) ,un_finish_parent AS ( SELECT id, parent_id FROM blocks WHERE type = 'l' and id in ( select parent_id from blocks where markdown like "* [ ]%" and type = 'i' and subtype = 't' ) ) select * from blocks where id not in (select parent_id from un_finish_parent ) and id not in (select id from finish_tree) and root_id = '20240522181405-mdiudfl' and type = 'i' and subtype = 't' limit 10
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