ORACLE 正负数分开排序 SQL

ORACLE 正负数分开排序 SQL

表结构

create table TEST_ORDER
(
  t_name  VARCHAR2(5),
  t_value NUMBER(3)
);

表数据

insert into TEST_ORDER (t_name, t_value) values ('A', 10);
insert into TEST_ORDER (t_name, t_value) values ('B', 30);
insert into TEST_ORDER (t_name, t_value) values ('C', 20);
insert into TEST_ORDER (t_name, t_value) values ('D', 40);
insert into TEST_ORDER (t_name, t_value) values ('E', -10);
insert into TEST_ORDER (t_name, t_value) values ('F', -30);
insert into TEST_ORDER (t_name, t_value) values ('G', -20);

T_NAME	T_VALUE
A	10
B	30
C	20
D	40
E	-10
F	-30
G	-20

先正后负 正数升序 负数降序

SELECT T_NAME, T_VALUE
  FROM TEST_ORDER
 ORDER BY SIGN(T_VALUE) DESC, ABS(T_VALUE) ASC;

SELECT T_NAME,
       T_VALUE,
       RANK() OVER(ORDER BY SIGN(T_VALUE) DESC, ABS(T_VALUE) ASC) AS RANKING
  FROM TEST_ORDER;

T_NAME	T_VALUE	RANKING
A	10	1
C	20	2
B	30	3
D	40	4
E	-10	5
G	-20	6
F	-30	7

先正后负 正数降序 负数升序

SELECT T_NAME, T_VALUE
  FROM TEST_ORDER
 ORDER BY SIGN(T_VALUE) DESC, ABS(T_VALUE) DESC;

SELECT T_NAME,
       T_VALUE,
       RANK() OVER(ORDER BY SIGN(T_VALUE) DESC, ABS(T_VALUE) DESC) AS RANKING
  FROM TEST_ORDER;

T_NAME	T_VALUE	RANKING
D	40	1
B	30	2
C	20	3
A	10	4
F	-30	5
G	-20	6
E	-10	7