oracle join and ansi join

Oracle JOIN and ANSI JOIN are two types of SQL join syntax used to combine data from two or more tables.

Oracle JOIN syntax uses the (+) operator to indicate the outer join. In Oracle, the outer join can be either a left outer join, a right outer join, or a full outer join. Here's an example of an Oracle left outer join:

SELECT *
FROM table1, table2
WHERE table1.column1 = table2.column2(+);

On the other hand, ANSI JOIN syntax uses the JOIN keyword to specify the type of join (INNER, LEFT, RIGHT, or FULL), and the ON keyword to specify the join condition. Here's an example of an ANSI left outer join:

SELECT *
FROM table1
LEFT OUTER JOIN table2
ON table1.column1 = table2.column2;

ANSI JOIN syntax is considered more standardized and easier to read, while Oracle JOIN syntax is more concise and familiar to Oracle developers.