So, with the syntax shown earlier in mind, let us put things together, and look at some practical examples.
BTW – If you are interested in where I get the data for these examples – they are from the sample schemas (OE, HR, etc.) that comes with most Oracle database installations.
The subquery must return exactly one row that includes all the columns listed.
The column values returned by the subquery are assigned to the columns in the column list in order. WHERE search_condition Chooses which rows to update in the database table.
DEPARTMENT FROM PERSONS P, TEMP_ECOLAB_PERSONS TE WHERE P.
DEPARTMENT; MERGE INTO PERSONS_TMP PT USING ( SELECT P.
He loves teaching others, and like to share his thoughts, ideas, and experience on his blog.
Anyhow, in this example, let’s pretend we are going to build a summarized table with order totals for our customers.
But, we only want to use the customers that actually have had a purchase.
But, at the same time they were going to be under management of manager id # 205.
Here is a simple update: And, of course remember to commit.
profile_cur has 19 columns and has 1-2 million rows.