SQL缺少語句

Question

請幫忙。我列在下面MYTABLE：A，B，C，d，E，G，H

我想要做一些處理，只得到3列（A，價格和h）

select a, if a = b and d = e then g/h as price 
else 
if a = d then g/100 as price 
else 
h/100 as price 
if price = 0 
then 
price = 0.1, 
h 
from my table 

---

感謝所有，但我仍然得到'無效的參數數量。下面是我的SQL

選擇TICKETID AS 「BLO」，

情況下（NOTIONAL_CURRENCY = BASE_CURRENCY AND PREMIUM_CURRENCY = TERM_CURRENCY） THEN 輪（（TERM_MARKET_PRICE /名義），9） 其他

case 

    when (NOTIONAL_CURRENCY = PREMIUM_CURRENCY) 
       THEN 
        round((BASE_MARKET_PRICE_PERCENT/100),9) 
     else 

round((TERM_MARKET_PRICE_PERCENT/100),9) 

    else .1 end 

END爲 「價格」

，TERM_CURRENCY 「貨幣」

FROM DBAPP.SD_STAGE

Answer 1

用例代替if，它會做你想做的。

例如像select a, case when a = b and d = e then g/h else case when a = d then g/100 else h/100 else .1 end else .1 end as price from my_table

Answer 2

的語法在SQL條件語句是

CASE WHEN <condition> THEN a ELSE b END CASE 

您的選擇可以寫爲：

select a, 
     case when (case when a = b and d = e and h > 0 then g/h 
      when a = d then g/100 
      else h/100 
      end case) = 0 then .1 
     else (case when a = b and d = e then g/h 
      when a = d then g/100 
      else h/100 
      end case) 
     end case as price, 
     h 
from my table 

簡化：

select a, 
     case when a = b and d = e and h > 0 and g > 0 then g/h 
      when a = d and g > 0 then g/100 
      when h > 0 then h/100 
      else 0.1 
     end case as price, 
     h 
from my table 

Answer 3

可能在某些SQL簡單品種，但要覆蓋他們所有你可以只窩一個CASE;

SELECT a, CASE 
      WHEN a = b AND d = e THEN CASE WHEN g=0 THEN 0.1 ELSE g/h END 
      WHEN a = d   THEN CASE WHEN g=0 THEN 0.1 ELSE g/100 END 
      ELSE      CASE WHEN h=0 THEN 0.1 ELSE h/100 END    
      END price, h 
FROM my_table