Split table into different level columns

问题

I have got a requirement to split the data based on the level into 3 different columns. In the below table SU_DC_1 is the top level based on SETTLEUNIT column I need to add the level.

Parent : TOPSETTLUNIT Child : SETTLEUNIT

Based on Child I need to create 3 additional columns

In the above hierarchy is mentioned as

• Output:

I am finding it difficult to write the query for it. Could you please help .

回答1:

Something like:

SELECT topsettlunit,
       settleunit,
       CONNECT_BY_ROOT( topsettlunit ) AS level1,
       CASE LEVEL
         WHEN 1 THEN settleunit
         WHEN 2 THEN topsettlunit
       END AS level2,
       CASE LEVEL
         WHEN 2 THEN settleunit
       END AS level3
FROM   your_table
START WITH topsettlunit NOT IN ( SELECT settleunit FROM your_table )
CONNECT BY PRIOR settleunit = topsettlunit;

来源：https://stackoverflow.com/questions/44903329/split-table-into-different-level-columns