Left and right connections in Oracle and SQL

Oracle can use (+) to replace the left and right connections, the interesting thing is the plus sign on the left is the right connection, the plus sign is to make a link to the bottom, as follows

Select A.*, b.* from a.x (+) = b.x is a right connection, which is equivalent to select A.*, b.* from a starboard join B on A.x=b.xselect a.*, b.* from a.x = b.x (+ ) is a left connection, which is equivalent to select A.*, b.* from a, and then to join B on a.x=b.x

The following is a deeper understanding of the left connection through the W3school

And so on, the right connection on their own experience it.

Left and right connections in Oracle and SQL