인동머스크

Table: Tree+-------------+------+| Column Name | Type |+-------------+------+| id | int || p_id | int |+-------------+------+id is the column with unique values for this table.Each row of this table contains information about the id of a node and the id of its parent node in a tree.The given structure is always a valid tree. Each node in the tree can be one of three types:"Leaf..

Table: Stocks+---------------+---------+| Column Name | Type |+---------------+---------+| stock_name | varchar || operation | enum || operation_day | int || price | int |+---------------+---------+(stock_name, operation_day) is the primary key (combination of columns with unique values) for this table.The operation column is an ENUM (category) of type ('Sell', 'Bu..