What is the method for performing a join query in Oracle?
In Oracle, joining tables can be achieved by using the JOIN keyword in SQL statements. Common ways of joining tables include:
- Join that only includes rows that have matching values in both tables.
SELECT columns
FROM table1
INNER JOIN table2
ON table1.column = table2.column;
- Merge two tables based on a common column and include all rows from the left table.
SELECT columns
FROM table1
LEFT JOIN table2
ON table1.column = table2.column;
- – Right outer join
SELECT columns
FROM table1
RIGHT JOIN table2
ON table1.column = table2.column;
- Full outer join
- No suitable response
SELECT columns
FROM table1
FULL JOIN table2
ON table1.column = table2.column;
The above are common methods for performing join queries in Oracle, and the appropriate join type can be selected based on the specific situation to meet the query needs.