Pl sql inserting updating
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In most standard approaches, the following statement will likely provide better performance.
This will do a table/index scan for both the SELECT statement and the UPDATE statement.
The first one, which you learned in Chapter 1, is initialization with the “:=” syntax.
In this lab we will learn how to initialize a variable with a select statement by making use of the SET SERVEROUTPUT ON DECLARE v_average_cost VARCHAR2(10); BEGIN SELECT TO_CHAR(AVG(cost), ',999.99') INTO v_average_cost FROM course; DBMS_OUTPUT.
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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.
You will learn more about handling exceptions in Chapters 8, 9, and 10.
These variables can then be used in DML statements (insert, delete, or update).
Additionally, we will demonstrate how you can use a sequence in your DML statements within a PL/SQL block much as you would in a stand-alone SQL statement.
PUT_LINE('The average cost of a '