Oracle sql updating multiple rows Totaly free adult chat
What I want to do is either insert only the new rows, or insert the new rows and update the changed rows (depending on the scenario). If I want to insert only the rows that will not violate the unique index, I can: Which method to use largely depends on requirements.If the software must support multiple database backends or versions, perhaps the generic, standard queries are the best bet.In this article I have discussed several ways to use such non-standard extensions in My SQL for performance and convenience. Not only does it potentially make code non-portable, it can encourage mediocrity by teaching bad habits instead of teaching people the “right” way to do things.For example, updating multiple tables in a single statement, or inserting and updating at the same time, are definitely strange and ugly things to do.
That’s a terrible way to update data, but for various reasons, I’m sure many readers have found themselves in a similar situation.
In this article I’ll give an overview of each feature, help you understand how to choose among them, and point out some things to watch out for. I assume My ISAM tables without support for transactions, with the following sample data: create table t1 ( a int not null primary key, b int not null, c int not null ) type=My ISAM; create table t2 ( d int not null primary key, e int not null, f int not null ) type=My ISAM; insert into t1 (a, b, c) values (1, 2, 3), (2, 4, 6), (3, 6, 9); insert into t2 (d, e, f) values (1, 1, 1), (4, 4, 4), (5, 5, 5);.
Recall that in My SQL, a primary key is simply a unique index named PRIMARY.
to allow inserting and updating exactly the desired data.
These features provide a lot of power and flexibility, making My SQL significantly more capable than it otherwise might be.SQL SET SERVEROUTPUT ON DECLARE l_id t1.id%TYPE; BEGIN UPDATE t1 SET description = description WHERE description = 'FOUR' RETURNING id INTO l_id; DBMS_OUTPUT.put_line('UPDATE ID=' || l_id); DELETE FROM t1 WHERE description = 'FOUR' RETURNING id INTO l_id; DBMS_OUTPUT.put_line('DELETE ID=' || l_id); COMMIT; END; / UPDATE ID=4 DELETE ID=4 PL/SQL procedure successfully completed.