SQL：标记具有重复值但交替列的多个记录

Question

我遇到问题。我有SQL表有两个变量，但重复交替。 因此，如果我们有一个表

A_ID OTHER_ID 
1111  2222 
2222  1111  
0000  0101 
3333  5555 
5555  3333 

我想唯一的表

A_ID OTHER_ID  
1111 2222   
0000 0101 
3333 5555 

或者，

A_ID OTHER_ID FINAL_ID 
1111 2222  2222  
2222 1111  2222   
0000 0101  0101   
3333 5555  3333  
5555 3333  5555 

感谢。

Answer 1

data dat; 
    input A_ID $ OTHER_ID $; 
    datalines;      
1111  2222 
2222  1111  
0000  0101 
3333  5555 
5555  3333 
; 

proc sql; 
    create table temp as 
    select A_ID, OTHER_ID, 
    case 
     when (A_ID<OTHER_ID) then cat(A_ID,OTHER_ID) 
     when (OTHER_ID<A_ID) then cat(OTHER_ID,A_ID) 
     end as key 
    from dat 
    order by A_ID; 
quit; 

data final; 
    retain A_ID OTHER_ID; 
    set temp; 
    by key; 
    if first.key; 
run; 

表temp创建一个关键变量，它是A_ID和OTHER_ID的八位串联，一旦它们被数字排序。然后通过查看这个关键变量可以找到不同的组合。

表温度看起来是这样的：

Obs A_ID OTHER_ID key 
1 0000 0101 0000 0101 
2 1111 2222 1111 2222 
3 2222 1111 1111 2222 
4 3333 5555 3333 5555 
5 5555 3333 3333 5555 

Answer 2

对于第一输出： -

/***In SQL server***/  
CREATE TABLE TABLES2(A_ID varchar(20), OTHER_ID varchar(20)); 

INSERT INTO TABLES2 VALUES('1111','2222'); 
INSERT INTO TABLES2 VALUES('2222','1111'); 
INSERT INTO TABLES2 VALUES('0000','0101'); 
INSERT INTO TABLES2 VALUES('3333','5555'); 
INSERT INTO TABLES2 VALUES('5555','3333'); 


select A_ID ,OTHER_ID 
from 
(
Select distinct A_ID ,OTHER_ID,(lag(OTHER_ID) over (order by A_ID)) as col_lag 
from tables2 
) a 
where A_ID <> col_lag or col_lag is null 


/****OUTPUT****/ 
A_ID OTHER_ID 
0000 0101 
1111 2222 
3333 5555 

select A_ID ,OTHER_ID 
from 
(
Select distinct A_ID ,OTHER_ID,(lag(OTHER_ID) over (order by A_ID)) as col_lag 
from tables2 
) a 
where A_ID <> col_lag or col_lag is null  


/***In SAS with same logic using lag function***/ 

data have; 
    input A_ID OTHER_ID ; 
    datalines;     
1111  2222 
2222  1111 
0000  0101 
3333  5555 
5555  3333 
; 

data have; 
set have; 
col_lag =lag(OTHER_ID); 
run; 

/* if character columns*/ 
proc sql; 
create table answer as 
select A_ID ,OTHER_ID from 
(
Select distinct A_ID ,OTHER_ID,col_lag 
from have 
) a 
where col_lag not= A_ID or col_lag not= ' '; 
quit; 

/* if numeric columns*/ 
proc sql; 
create table answer as 
select A_ID ,OTHER_ID from 
(
Select distinct A_ID ,OTHER_ID,col_lag 
from have 
) a 
where col_lag not= A_ID or col_lag not=.; 
quit; 

希望这有助于:-)