加入复杂的SQL Oracle选择查询

Question

I have a complex query that selects product id values from history and orders.

SELECT ProductID
FROM History h ( SELECT .....) LATEST
WHERE h.ProductId = LATEST.ProductID
AND ....
AND IsActive = true; 

This query is too long, so I could not write all of it. But it returns a table like this:

ProdutID
--------
4654654
9879879
5465465
2132188
7894215
....

I want to join this product id result another table that containts ProductId column.

SELECT * FROM MySecondTable;

ProductID   Color
---------   -----
4654654     red
9879879     blue
5465465     orange

How can I join these two query?

Answer 1

CTEs are a really simple way to do such a thing:

with t as (<your query here>)
select t.*, t2.color
from t join
     MySecondTable t2
     on t.ProductId = t2.ProductId;

You could also just add the join to the from clause of the original query.

Answer 2

you could use the firts as inner joined table

  SELECT b.* 
  FROM MySecondTable b
  INNER JOIN (
      SELECT ProductID
      FROM History h ( SELECT .....) LATEST
      WHERE h.ProductId = LATEST.ProductID
      AND ....
      AND IsActive = true;
  ) t on t.ProductID = b.ProductID