組合計數和合並列PL/SQL

Question

如何將兩個查詢合併爲3列？ BR_SURG_SLN_POS和BR_SURG_NSLN_POS總是爲0-4，所以如果這兩列可以合併爲一列，因爲它們的值是相同的。 我想要計算下兩列（BR_SURG_SLN_POS）和計數（BR_SURG_NSLN_POS）。我嘗試使用concat來合併兩列，但它不是我想要的結果。

select 
br_surg_SLN_POS, 
count(BR_SURG_SLN_POS)<BR> 
from BR_SURGERY<BR> 
where BR_SURG_SLN_POS between 0 and 4<BR> 
group by 
BR_SURG_SLN_POS<BR> 
order by 
BR_SURG_SLN_POS 

---

select 
br_surg_NSLN_POS, 
count(BR_SURG_NSLN_POS)<BR> 
from BR_SURGERY<BR> 
where BR_SURG_NSLN_POS between 0 and 4<BR> 
group by 
BR_SURG_NSLN_POS<BR> 
order by 
BR_SURG_NSLN_POS 

---

與此類似：

Answer 1

試試這個

select t1.sln_value, t1.sln_cnt , t2.nsln_cnt from 
    (select 
     br_surg_SLN_POS sln_value, 
     count(BR_SURG_SLN_POS) sln_cnt 
    from BR_SURGERY 
     where BR_SURG_SLN_POS between 0 and 4<BR> 
     group by 
      BR_SURG_SLN_POS) t1, 
    (select 
      br_surg_NSLN_POS nsln_value, 
      count(BR_SURG_NSLN_POS) nsln_cnt 
     from BR_SURGERY 
     where BR_SURG_NSLN_POS between 0 and 4 
      group by 
      BR_SURG_NSLN_POS) t2 
      where t1.sln_value = t2.nsln_value 
      ;