Oracle SQL Questions for combined INSERT/UPDATE?

I have a table with 4 columns:

ID (Primary Key)

I need a single SQL statement to perform an update if the primary key in the sql already exists or an insert if the primary key does not already exist? Any ideas? I'm hoping there is some way to do this in one statement.

I could easily do an SQL statement in my code to see if the primary key exist then do an if else to do either an insert/update, but that sounds like a waste of code and inneficient if an single oracle SQL query would cover both for me.
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HainKurtSr. System AnalystCommented:
not one statement but:

option 1:

  insert ...
when DUP_VAL_ON_INDEX then
  update ...
when others then null;

option 2:

select count(1) into cnt from ...
if (cnt=0)

option 3:

MERGE which is posted before...

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or you can do like this
update tablename set name=<<ne name>> where id=id;

if sql%norfound then
   insert into table name values(id,name,data1,data2)

Hope this helps.

What is the source for your updates or inserts? Is it a file or another table?
Mark GeerlingsDatabase AdministratorCommented:
Without knowing anything about the percentage of inserts compared to updates, your most efficient option is likely to use the "merge" syntax that Oracle SQL supports now.  

Also, remember that using PL\SQL is almost always slower than using SQL by itself, so the PL\SQL examples using "if" statements and "exception" sections will likely be slower than a straight SQL solution.
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