Pl sql updating tables from another table
But, the syntax example above might not show the whole truth, since we can have a situation like this: In the expanded version of our UPDATE syntax above, the value that we want to update column1 with, actually comes from a different table.
BUT, in this post I really wanted to show you how to update multiple columns in a table at once.
In this article, we are going to look at four scenarios for Oracle cross table update. Category_ID) where exists ( select * from Categories b where b. These columns uniquely identify a record in a table.
Suppose we have two tables Categories and Categories_Test. The common column in the two tables is CATEGORY_ID. Please note that query below is used for illustration purpose because Category_ID alone is primary key.
When I try to update only the missing data the non-matched data is also updated but to NULL. The reason some of your rows are getting NULLs updated is due to the subquery.
But, you might have to have your DBA activate the schemas, and give you access.
Let us start simple, and pretend that the department with id # 20, “Marketing” is from now on going to be named “Customer Relations”.
First off: The Oracle UPDATE statement is a part of the Oracle DDL (Data Definition Language) that can be used to alter the content or structure of a table in our database.
Some examples of DDL can be can be one condition, or multiple, dependent on what you need. be that you want to update just customers that are located in one area of the world.