Join a Parent Table with 2 Child table based on a value

Question

Dear Guru's
We have a Parent Table and 2 Child table . The Parent Table has a column like seqtype with only 2 possible values C and S . If the Value is C , then the details are available in Child 1 table and if the Value is S then the Details are in Child 2 table
How can we query the Data from this type of arrangement ? I am little bit confused and hit a road block
Will the following query will work ?
Select
from Parent P , Child C1, Child C2
where P.seqtype = C1.Seqtype
and P.seqtype = C2.Seqtype
With Warm Regards
ssr

Answer 1

You didn't mention the column names in two child tables. Whether the columns are same in 2 tables of these are different.
If the columns are same better to go and change your design to have only one child table. However if stiil business stops you having one table you can use UNION ALL (Assuming you want to fetch same column information from two child tables) like below:
SELECT p.col1
      ,c1.col2
      ,c1.col3
      ,c1.col4
  FROM parent     p
      ,child      c1
WHERE p.seqtype = c1.seqtype
UNION ALL
SELECT p.col1
      ,c2.col2
      ,c2.col3
      ,c2.col4
  FROM parent     p
      ,child      c2
WHERE p.seqtype = c2.seqtype Regards
Arun