Does derived table use where clause fillters inside

Question

dear all.
Table "A" has two cols aid and col1 , aid is pk.
Table "B" has two cols  bid , aid , and colb .
followin query can be formulated in other ways ,but i wanted to ask something about query processing.
select aid,aa.ca,aa.cb
from A
left join
(select aid, b.colb ca ,b1.colb  cb
 from A
left join B on a.aid=b.aid and b.colb='r'
left join B b1 on a.aid=b1.aid and b1.colb='e'
) aa
where a.aid (1,2)
i wanted to know if i put the where clause "where a.aid(1,2) in side derived table aa
then will it change its plan in any case or it is sufficant to put where clasue in last
or i should put the where clause in side the derive table "aa" also.
yours sincerley

Answer 1

Please post DDL, so that people do not have to guess what the keys, constraints, Declarative Referential Integrity, data types, etc. in your schema are. Learn how to follow ISO-11179 data element naming conventions and formatting rules. Temporal data should
use ISO-8601 formats. Code should be in Standard SQL as much as possible and not local dialect. 
This is minimal polite behavior ON SQL forums. Is your boss this rude to you?? 
CREATE TABLE Alphas
(alpha_id INTEGER NOT NULL PRIMARY KEY,
 col1 INTEGER NOT NULL);
Thanks to your rude, poor narrative I have to guess about the second table: 
CREATE TABLE Betas
(beta_id INTEGER NOT NULL PRIMARY KEY, 
 alpha_id INTEGER NOT NULL
   REFERENCES Alphas(alpha_id), 
 colb CHAR(1) NOT NULL);
Your query is awful. OUTER JOINs are rare in a properly designed schemA. The DRI should guarantee inner joins!  We seldom need to re-name columns. 
>> I wanted to know if I put the where clause WHERE A.alpha_id(1,2) in side derived table aa <<
That is not a syntactically invalid search condition; did you mean 
“WHERE A.alpha_id IN (1,2)” ??
Why did you de-normalize your results? My guess is that you can get the same data with this: 
SELECT alpha_id, colb
  FROM Betas AS B
 WHERE colb IN ('r', 'e')
   AND alpha_id IN (1, 2);
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