oracle Sql语句记录

1. 在数据库中有一树型结构表，现需要查询所有叶子节点

   
   select *
     from (SELECT CONNECT_BY_ISLEAF, m.*
             FROM test_table m
            START WITH m.pid IS NULL
                  
           CONNECT BY m.pid = PRIOR id) t
    where t.CONNECT_BY_ISLEAF = 1

2. 数据表重命名

alter table ts01 rename to ts01_new;   #修改表名的语法:alter table rename to/as new_tablename;

3、 树形结构同级排序

SELECT t.*
FROM pt_org_info t
START WITH t.id = 1
CONNECT BY t.par_id = PRIOR t.id
ORDER SIBLINGS BY t.id;