Thiết lập Oracle :
CREATE TABLE table_name ( GRAND_MODEL, WAIT_4_MODEL_NAME ) AS
SELECT 'test', 'test1' FROM DUAL UNION ALL
SELECT 'test', 'test2' FROM DUAL UNION ALL
SELECT 'test', 'test3' FROM DUAL UNION ALL
SELECT 'test2', 'test3' FROM DUAL UNION ALL
SELECT 'test3', 'test4' FROM DUAL UNION ALL
SELECT 'test4', 'test5' FROM DUAL;
Truy vấn :
SELECT REGEXP_SUBSTR( tests, '[^|]+', 1, 1 ) AS first_model,
REGEXP_SUBSTR( tests, '[^|]+', 1, 2 ) AS second_model,
REGEXP_SUBSTR( tests, '[^|]+', 1, 3 ) AS third_model,
REGEXP_SUBSTR( tests, '[^|]+', 1, 4 ) AS fourth_model,
REGEXP_SUBSTR( tests, '[^|]+', 1, 5 ) AS fifth_model,
REGEXP_SUBSTR( tests, '[^|]+', 1, 6 ) AS sixth_model,
REGEXP_SUBSTR( tests, '[^|]+', 1, 7 ) AS seventh_model,
REGEXP_SUBSTR( tests, '[^|]+', 1, 8 ) AS eighth_model,
REGEXP_SUBSTR( tests, '[^|]+', 1, 9 ) AS ninth_model
FROM (
SELECT SYS_CONNECT_BY_PATH( wait_4_model_name, '|' ) || '|' || grand_model AS tests
FROM table_name
CONNECT BY PRIOR grand_model = wait_4_model_name
);
Đầu ra :
FIRST_MODEL SECOND_MODEL THIRD_MODEL FOURTH_MODEL FIFTH_MODEL SIXTH_MODEL SEVENTH_MODEL EIGHTH_MODEL NINTH_MODEL
----------- ------------ ----------- ------------ ----------- ----------- ------------- ------------ -----------
test1 test
test2 test
test3 test
test3 test2
test3 test2 test
test4 test3
test4 test3 test
test4 test3 test2
test4 test3 test2 test
test5 test4
test5 test4 test3
test5 test4 test3 test
test5 test4 test3 test2
test5 test4 test3 test2 test
