Oracle sql updating multiple rows
But it often cannot, or it is too difficult to make it do so, so resorting to SQL is the way to go.
SET SERVEROUTPUT ON DROP TABLE post; CREATE TABLE post ( id INT NOT NULL PRIMARY KEY, text VARCHAR2(1000) NOT NULL, archived NUMBER(1) NOT NULL CHECK (archived IN (0, 1)), creation_date DATE NOT NULL ); CREATE INDEX post_creation_date_i ON post (creation_date); ALTER SYSTEM FLUSH SHARED_POOL; ALTER SYSTEM FLUSH BUFFER_CACHE; CREATE TABLE results ( run NUMBER(2), stmt NUMBER(2), elapsed NUMBER ); DECLARE v_ts TIMESTAMP WITH TIME ZONE; PROCEDURE reset_post IS BEGIN EXECUTE IMMEDIATE 'TRUNCATE TABLE post'; INSERT INTO post SELECT level AS id, lpad('a', 1000, 'a') AS text, 0 AS archived, DATE '2017-01-01' (level / 100) AS creation_date FROM dual CONNECT BY level import
The following example illustrates the use of the DEFAULT keyword: The DEFAULT keyword in the values list will insert the value that was specified as the default for a particular column during table creation. My SQL, Postgre SQL, and SQL Server users have another option available if all columns in the table are defined with a default value (as table D is in this case).
Hint: Always know what your ORM (if you're using one) is doing, because the ORM can help you with automatic batching/bulking in many cases. For tables with a mix of default and non-default columns, inserting default values for a column is as easy as excluding the column from the insert list; you do not need to use the DEFAULT keyword.Say that table D had an additional column that was not defined with a default value: Not everyone realizes that you can explicitly specify NULL in the values list of an INSERT statement.Likewise, updating and deleting start out as simple tasks.You can update one record, and you can delete one record.