Outer join - problem with the name of the table in the select list
Oracle Database 11 g Enterprise Edition Release 11.2.0.2.0 - 64 bit Production
create table (j1)
number of C1,
number of C2);
create table (j2)
number of C1,
number of C2);
insert into values j1 (1, 10);
insert into j1 values (1, 100);
insert into values j1 (1, 1000);
insert into values j2 (1, 2);
insert into values j2 (1, 4);
insert into values j2 (1, 8);
commit;
Select c1, j1.c2, j2.c2 of outer join of j1 j2 using (c1); - DOES NOT
Select c1, j1 j2 (c1) using outer join j2.c2. - WORK
Why?
Hello
Interesting question! Oracle goes very far in trying not to trigger an error.
The OUTER keyword (if used; it is always optional) must be preceded by one of the keywords, right or LEFT. Since neither LEFT, RIGHT, or FULL comes before OUTER in queries in your first message, it does not recognize as keyword OUTER and treats him like a table alias for table j1. Since j1 has an alias, the real table name cannot be used in the SELECT clause. This query is executed:
SELECT c1
outer.c2
j2.c2
External J1
Join the HELP of j2 (c1)
;
There is an INTERNAL join. Add to your sample data:
insert into values of j1 (-1, -10);
insert into values of j2 (-2, -20);
to be specified.
Moreover, USING is short for confUSING. I suggest you use IT for all the join conditions. Everyone (unless they you write or read a manual) does.
Tags: Database
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[amended to be readable by an admin text]
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