SQL Vergleichswert in Spalte

Question

Ich muss Leistungswert zuletzt vergleichen Zeichen W1 mit W6, W2 mit W7, W3 mit W8 usw. Wenn der Leistungswert anders ist, dann muss ich die Zelle & Leistungsinfo ausgeben.

cell | power 
---------+------- 
HUNDAW1 | 300 
HUNDAW2 | 300 
HUNDAW3 | 300 
HUNDAW6 | 300 
HUNDAW7 | 320 
HUNDAW8 | 300 

vergleichen Zellen Macht. verschiedene Leistungswerte

HUNDAW1 & HUNDAW6 
HUNDAW2 & HUNDAW7 
HUNDAW3 & HUNDAW8 

    cell | power 
---------+------- 
HUNDAW2 | 300 
HUNDAW7 | 320 

Answer 1

with t (cell, power) as (values 
    ('HUNDAW1',300), 
    ('HUNDAW2',300), 
    ('HUNDAW3',300), 
    ('HUNDAW6',300), 
    ('HUNDAW7',320), 
    ('HUNDAW8',300) 
) 
select 
    t0.cell as t0_cell, t0.power as t0_power, 
    t1.cell as t1_cell, t1.power as t1_power 
from 
    t t0 
    inner join 
    t t1 on t0.cell < t1.cell 
where 
    t0.power <> t1.power 
    and 
    (t0.cell, t1.cell) in (
     ('HUNDAW1','HUNDAW6'),('HUNDAW2','HUNDAW7'),('HUNDAW3','HUNDAW8') 
    ) 
order by t0.cell, t1.cell 
; 
t0_cell | t0_power | t1_cell | t1_power 
---------+----------+---------+---------- 
HUNDAW2 |  300 | HUNDAW7 |  320 

Answer 2

with t as 
     (
      select cell,power 
        ,count(*)  over()    as cnt 
        ,row_number() over (order by cell) as rn 

      from mytable 
     ) 

select  t1.cell,t1.power 

from    t as t1 

      join t as t2 

      on  t2.rn = (t1.rn + (t1.cnt/2) - 1) % t1.cnt + 1 

where  t1.power <> t2.power 

order by t1.cell  

---

+---------+-------+ 
| cell | power | 
+---------+-------+ 
| HUNDAW2 | 300 | 
+---------+-------+ 
| HUNDAW7 | 320 | 
+---------+-------+