Join predicates, is this true?
Hi all
Yesterday when I look at the blog of Oracle, I met a heading called conversion Optimizer: join predicates (https://blogs.oracle.com/optimizer/entry/basics_of_join_predicate_pushdown_in_oracle). I interested in the topic, then read the article. The thing is when I tried to use this join method, I have legitimately get error ORA-00904. Because, the logical syntax of predicates attached is to use the column equilzation out of reach, as follows. Is it not illogical? It should give error. Can anyone throw some light on this you subject?
SELECT T4.unique1, V.unique3
OF T_4K T4.
(SELECT
T10.unique3, T10.hundred, T10.ten
OF T_5K T5, T10 T_10K
WHERE T5.unique3 = T10.unique3
AND T4.unique3 = V.hundred (+)
AND T4.ten =
V.Ten (+)) V
WHERE T4.thousand = 5;
Concerning
Charlie
Immediately above the statement that you quote is the following
undergoes a join predicates, we get the query B. Note this query B is expressed in a non-standard SQL and displays an internal representation of the query.
So, Yes, the statement you quote is not a valid syntax. It shows the transformation logic that is carried out.
Justin
Tags: Database
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