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A transaction in Oracle is a series of SQL statements that have been grouped together into a logical unit by the programmer.
In this chapter from Oracle PL/SQL by Example, 5th Edition, learn how to make use of variables and the various ways to populate variables.
This chapter also covers transactional control in PL/SQL by explaining what it means to commit data as well as how SAVEPOINTs are used.
If we refer to the Books Online documentation, it gives examples that are similar to: IF EXISTS (SELECT * FROM Table1 WHERE Column1='Some Value') UPDATE Table1 SET (...) WHERE Column1='Some Value'ELSE INSERT INTO Table1 VALUES (...) This approach does work, however it might not always be the best approach.
This will do a table/index scan for both the SELECT statement and the UPDATE statement.
Here is an example of a PL/SQL block that updates an existing entry in the DECLARE v_zip zipcode.zip%TYPE; v_user zipcode.created_by%TYPE; v_date zipcode.created_date%TYPE; BEGIN SELECT 43438, USER, SYSDATE INTO v_zip, v_user, v_date FROM dual; INSERT INTO zipcode (ZIP, CREATED_BY , CREATED_DATE, MODIFIED_BY, MODIFIED_DATE ) VALUES(v_zip, v_user, v_date, v_user, v_date); END; statements in PL/SQL that return no rows or too many rows will cause an error to occur that can be trapped by using an exception.v_average_cost); END; SET SERVEROUTPUT ON DECLARE v_average_cost VARCHAR2(10); BEGIN DBMS_OUTPUT.PUT_LINE('The average cost of a ' Tags: Adult Dating, affair dating, sex dating