How to use join by applying select Method

[Brunoz]

How to select using join. You can write different select queries by writing appending clause. How do I count the users that have completed specific activities. I've created a table and want to join outer table with another table, getting only the first row of the second table using Oracle 9.2.

[wllwnn]

Every update should have one record. But a record with the same Unique ID can be updated multiple times. If part or all of the result of a SELECT statement is equivalent to an existing materialized view, WITH x AS then Oracle Database may use the materialized view in place of one or more tables specified in the SELECT statement. This substitution is called query rewrite.

DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (x int, y int);
DROP TABLE IF EXISTS bar;
CREATE TABLE t2 (z int, y int);

[Pauline]

It takes place only if cost optimization is enabled and the QUERY_REWRITE_ENABLED parameter is set to TRUE. There was an incomplete reset of the name resolution context, that caused INSERT ... SELECT ... JOIN statements to resolve not by joint row type calculated for the join. To determine whether query write has occurred, use the EXPLAIN PLAN statement.

[Tweaker]

select statement simply returns a result set, which has exactly the same definition as a table. However, try this one (changed LEFT JOIN with INNER JOIN) and let us know if it's better, If you make sure each column in the select statement has a specific "column name", then it works just like a table.

join('accounts', 'accounts.account_name = bugs.reported_by')
join('accounts', 'accounts.account_name = bugs.assigned_to')

A patch for this bug has been committed. After review, it may be pushed to the relevant source trees for release in the next version.