Update with Select from a non-existant column

Hello,
If I have two tables in Oracle database:
Table_1 has column id, c1, c2
Table_2 has column id, c1, c2
If I run the following select statement, it will give error, because column c3 does not exist:
select c3 from table_2;
However, if I run the following update statement, it run successfully with error. It shows, for example, 10 rows updated:
update table_1 t1 set t1.c2 =
(select t2.c3 from table_2 t2
where t2.id = t1.id);
Could someone explain to me what happens?
Regards!

rp0428 wrote:
>
It's called a Correlated Sub-Query . It's documented, with examples, in the SQL Language manual
>
I'm familiar with correlated sub-queries. That link has NO examples using a column in the FROM list of a sub-query that is NOT in a table in the FROM list of that sub-query.
You can certainly use constants, or functions in a select list without needing a table reference but I haven't seen any documentation showing an example of selecting a column in a sub-query that doesn't exist in one of the FROM tables.There are no examples of selecting a column from the outer query in a sub-query because in 99.999% of the cases it would be the wrong thing to do, however it is possible. Clearly the sub-query can "see" columns in the outer query otherwise how would it see the values for a correlated sub-query. As Frank said, there is nothing in the documenation that precludes using an outer column in the sub-query, and this paragraph from Frank's link certainly seems to pretty generally refer to the entire sub-query:
If columns in a subquery have the same name as columns in the containing statement, then you must prefix any reference to the column of the table from the containing statement with the table name or alias. To make your statements easier to read, always qualify the columns in a subquery with the name or alias of the table, view, or materialized view.John

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Alex Korneyev (guest) wrote:
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Hi,
mlov83 wrote:
Hello guys i have a cursor like so.
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Update with Select from a non-existant column

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