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11 lis 2015 · You could use the SQL%ROWCOUNT Oracle variable: UPDATE table1 SET field2 = value2, field3 = value3 WHERE field1 = value1; IF (SQL%ROWCOUNT = 0) THEN INSERT INTO table (field1, field2, field3) VALUES (value1, value2, value3); END IF;
19 lip 2022 · This does update-if-exists, insert-if-not-exists logic in one statement. The target table is currently empty, so every row from the source is an insert into the target UPSERT rows
This statement is equivalent to: update people_target t set (t.first_name, t.last_name) = ( select s.first_name, s.last_name from people_source s where s.person_id = t.person_id ) where exists ( select null from people_source s where s.person_id = t.person_id).
This tutorial will show you how to do update-or-insert logic in one statement using merge. It uses these two tables: select * from purchased_bricks; select * from bricks_for_sale;
19 lip 2022 · So you need "update if exists, insert if not exists" logic, aka UPSERT. This can lead to complex statements and conditional logic. The MERGE statement enables you to do both actions in one SQL statement. Join this session to learn how this works.
create table bridge (t1_key number, t2_key number, t1_id number, t2_id number) The T1.id is natural key. update bridge. set t1_key = (select key from t1 where t1.id = bridge.id) where exists (select key from t1 where t1.id = bridge.id) The T2.id is natural key. update bridge.
11 cze 2020 · You issue a select statement to find if the record exists and then do an update if the record exists OR directly update and check with sql%rowcount if sql%rowcount <= 0 then raise exception... end if; there is no FK relationships or checks during update
