Oracle database, sql in (+) (-) meaning

SELECT *FROM TABLE1 A，TABLE2 B WHERE A.ID(+)＝B.ID;

Right connecting = RIGHT JOIN

 

SELECT *FROM TABLE1 A，TABLE2 B WHERE A.ID＝B.ID(+);

Left = LEFT JOIN link

 

That is: the left side of the equal sign +, is connected to the right; + equal sign on the right side, is connected to the left