数据库是什么数据库?我先假设你是Oracle 吧。CREATE TABLE test_tree (test_id INTNOT NULL,pid
INT,test_valVARCHAR(10),PRIMARY KEY (test_id));INSERT INTO test_tree VALUES(1, NULL, '.NET');INSERT INTO test_tree VALUES(2, 1,
'C#');INSERT INTO test_tree VALUES(3, 1,
'J#');INSERT INTO ... |
