How to cascade update

how to cascade update?

Sorry everyone for going regional with my Mexican fiend!
In MEXMAN's first case, integrity on related data was already being enforced through a valid foreign key (TIZAYUCA.REGLAFAB_PRODUCTO_FK). However, the user wanted to update data included in the foreign key relationship. To acomplish this, I recommended to change the actual constraint state to defer validation until commit. Using the now familiar column names, the sentences are:
ALTER TABLE TIZAYUCA.REGLA_FABRICACION
DROP CONSTRAINT REGLAFAB_PRODUCTO_FK;
ALTER TABLE TIZAYUCA.REGLA_FABRICACION
ADD CONSTRAINT REGLAFAB_PRODUCTO_FK FOREIGN KEY (GRUPO, PRODUCTO)
REFERENCES TIZAYUCA.PRODUCTO (GRUPO, CLAVE)
INITIALLY DEFERRED;
In MEXMAN's second case, a wholly new integrity needs to be enforced between two tables but some actual data present in both tables do not validate the desired constraint. The offending rows from the child table (TIZAYUCA.PRESENTACION) may be obtained executing
SELECT *
FROM tizayuca.presentacion t
WHERE (t.grupo, t.producto) NOT IN
(SELECT p.grupo, p.clave
FROM tizayuca.producto p);
MEXMAN has 3 choices:
1. deleting the offending rows in the child table (TIZAYUCA.PRESENTACION) before executing
alter table TIZAYUCA.PRESENTACION enable constraint PRES_PROD_FK;
2. inserting the missing rows in the parent table (TIZAYUCA.PRODUCTO) before executing
alter table TIZAYUCA.PRESENTACION enable constraint PRES_PROD_FK;
3. making the new constraint ignore the present data and enforcing the relationship starting with new data:
alter table TIZAYUCA.PRESENTACION
add constraint PRES_PROD_FK foreign key (GRUPO, PRODUCTO)
references TIZAYUCA.PRODUCTO (GRUPO, CLAVE)
deferrable initially deferred
enable novalidate;
(drop the present PRES_PROD_FK constraint first)
Please find more on the constraint topic here:
http://download-east.oracle.com/docs/cd/B14117_01/server.101/b10759/clauses002.htm#CJAFFBAA
and here:
http://download-east.oracle.com/docs/cd/B14117_01/server.101/b10759/clauses002.htm#i1002273
Best regards,
Luis Morales,
ConsiteNicaragua.com

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I would like to understand how sql server 2008 deals with cascade updates
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Parent table: Employee with column Id as varchar(20) primary key
Child table with IdEmployee as varchar(20) foreign key
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>> would like to understand how sql server 2008 deals with cascade updates <<
Your posting has a number of conceptual errors.
1. The terms “parent” and “child” are not RDBMS; they are used in network databases. We have “referenced” and “referencing” tables; they can be the same table.
2. A table models a SET of things, so there is no “Employee” table unless you truly have a one-man company. We want a collective or plural name for the SET/table. A better name is “Personnel” for this table.
3. Her is no such thing as a generic “id” in RDBMS; it has to be “<something in particular>_id” to be valid. Identifiers are usually fixed length
4. It is very, very rude not to post DDL on a forum. You also do not know the ISO-11179 Rules for data element names. They do not change names from table to table! Does your name change whenever you use it in a new place?? NO! Same principle with data.
5. The ISO standard uses “<property>_<attribute property>” syntax, no the old PascalCase.
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CREATE TABLE Personnel
(emp_id CHAR(20) NOT NULL PRIMARY KEY,
emp_name VARCHAR(25) NOT NULL,
CREATE TABLE Health_Plan
(health_plan_acct CHAR(20) NOT NULL PRIMARY KEY,
emp_id CHAR(20) NOT NULL
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ON DELETE CASCADE,
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emp_name = 'something new'
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This time, I am doing something different. I am beside UPDATE of column emp_name with new value, also UPDATE PRIMARY KEY but
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SQL uses a set-oriented model, so the whole table is updated as a unit of work in theory.
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>> I put an timestamp column in child [sic: referencing] table that should UPDATE each time row gets updated <<
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outcome.
--CELKO-- Books in Celko Series for Morgan-Kaufmann Publishing: Analytics and OLAP in SQL / Data and Databases: Concepts in Practice Data / Measurements and Standards in SQL SQL for Smarties / SQL Programming Style / SQL Puzzles and Answers / Thinking
in Sets / Trees and Hierarchies in SQL

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