Re: Oracle Problem 1: Please Help

[singhjih]

The table looks like the following:
Code
-------------------

INSTRUCTOR_ID(P K) NUMBER(8,0) NOT NULL
SALUTATION VARCHAR2(5) NULL
FIRST_NAME VARCHAR2(25) NULL
LAST_NAME VARCHAR2(25) NULL
STREET_ADDRESS VARCHAR2(50) NULL
ZIP(FK) VARCHAR2(5) NOT NULL
PHONE VARCHAR2(15)
CREATED_BY VARCHAR(3)
CREATED_DATE DATE NOT NUL
-------------------
I'm not fully capable to write PL/SQL I just started last week howeve
I am a very compitent student. If I need to write a trigger could yo
lead me in the right direction
-
singhji
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[Hans Forbrich]

singhjih wrote:

>
The table looks like the following:
Code:
--------------------

INSTRUCTOR_ID(P K) NUMBER(8,0) NOT NULL
SALUTATION VARCHAR2(5) NULL
FIRST_NAME VARCHAR2(25) NULL
LAST_NAME VARCHAR2(25) NULL
STREET_ADDRESS VARCHAR2(50) NULL
ZIP(FK) VARCHAR2(5) NOT NULL
PHONE VARCHAR2(15)
CREATED_BY VARCHAR(3)
CREATED_DATE DATE NOT NULL
--------------------
I'm not fully capable to write PL/SQL I just started last week however
I am a very compitent student. If I need to write a trigger could you
lead me in the right direction.

Oracle has a lot of good documentation on their site at
http://docs.oracle.com. You should get familiar with the one called 'SQL
Reference' for language and syntax, and the one called PLSQL Reference (I
think) for general PLSQL.

CREATE TRIGGER and PLSQL Anonymous block are some keywords.

/Hans

[Dave]

Hans Forbrich <fo******@yahoo .netwrote in message news:<enBcc.755 9$Sh4.5308@edtn ps84>...

singhjih wrote:

The table looks like the following:
Code:
--------------------

INSTRUCTOR_ID(P K) NUMBER(8,0) NOT NULL
SALUTATION VARCHAR2(5) NULL
FIRST_NAME VARCHAR2(25) NULL
LAST_NAME VARCHAR2(25) NULL
STREET_ADDRESS VARCHAR2(50) NULL
ZIP(FK) VARCHAR2(5) NOT NULL
PHONE VARCHAR2(15)
CREATED_BY VARCHAR(3)
CREATED_DATE DATE NOT NULL
--------------------
I'm not fully capable to write PL/SQL I just started last week however
I am a very compitent student. If I need to write a trigger could you
lead me in the right direction.

Oracle has a lot of good documentation on their site at
http://docs.oracle.com. You should get familiar with the one called 'SQL
Reference' for language and syntax, and the one called PLSQL Reference (I
think) for general PLSQL.

CREATE TRIGGER and PLSQL Anonymous block are some keywords.

/Hans

Hans gives good advice. Check to doc, its quite complete. The key to
the trigger is that you can reference the old and new values with
syntax :new.<col_namea nd :old.<col_name. You can write PL/SQL code
in the trigger that references the old and new value and thus create
complex constraints.

Suggestion. Instead of trying to solve your problem straight out. Try
to create a very simple trigger to get familiar with the concept and
to see it work. Then tackle your problem.

Dave