在Oracle SQL中比較兩個選擇語句

Question

如何在Oracle SQL中比較兩個選擇語句

select sum(quantity)
from Table 1
where order_number = XXXX

select sum(quantity)
from Table 2
where order_number = XXXX

如果數量不匹配，如果匹配，應用程序將回滾，我需要執行更新操作。任何人都可以幫助我了解如何在Shell腳本中回滾並執行更新操作。

Answer 1

我會使用內部選擇語句來做類似的事情...

SELECT (whatever operations you gonna do) FROM dual WHERE (select sum(quantity) from Table 1 where order_number = XXXX) = (select sum(quantity) from Table 2 where order_number = XXXX);

除此之外，您還可以使用CASE WHEN THEN。