merge into MY_TABLE tgt using (select [expressions] from dual ) src on (src.key_condition = tgt.key_condition) when matched then update tgt set tgt.column1 = src.column1 [,...] when not matched then insert into tgt ([list of columns]) values (src.column1 [,...]); Unfortunately many frameworks such as Hibernate treat all database errors (e.g.unique constraint violation) as unrecoverable conditions, so it isn't always easy.
The implicit cursor attributes are: DROP TABLE dept_temp; CREATE TABLE dept_temp AS SELECT * FROM departments; CREATE OR REPLACE PROCEDURE p ( dept_no NUMBER ) AUTHID DEFINER AS BEGIN DELETE FROM dept_temp WHERE department_id = dept_no; IF DROP TABLE employees_temp; CREATE TABLE employees_temp AS SELECT * FROM employees; DECLARE mgr_no NUMBER(6) := 122; BEGIN DELETE FROM employees_temp WHERE manager_id = mgr_no; DBMS_OUTPUT.
It seemed like such a corner case to me until I was required to perform UPDATEs that are only valid if the state of the data since the last read is still the same.
DECLARE rt_mytable mytable%ROWTYPE; CURSOR update_mytable_cursor(p_rt_mytable IN mytable%ROWTYPE) IS SELECT * FROM mytable WHERE ID = p_rt_mytable.
Therefore, an explicit cursor or cursor variable is called a 2000; CURSOR c1 RETURN departments%ROWTYPE IS -- Define c1, SELECT * FROM departments -- repeating return type WHERE department_id = 110; CURSOR c3 RETURN locations%ROWTYPE; -- Declare c3 CURSOR c3 IS -- Define c3, SELECT * FROM locations -- omitting return type WHERE country_id = 'JP'; BEGIN NULL; END; / statement, thereby allowing its resources to be reused.
After closing a cursor, you cannot fetch records from its result set or reference its attributes.