Help with another query!
Date: Mon, 24 Mar 2003 13:23:14 -0000
Message-ID: <NHDfa.1399$YD5.164179_at_wards.force9.net>
Hi,
I have the following table structure, as my installation of MySQL doesnt support Foreign keys i have to maintain the referential integrity myself. So if i delete a user, how can i make sure that the allocations from the allocations table where the user_id is the same as the one being deleted and that bookings are deleted where the allocations_id is the same as the allocations deleted for that user_id?
Thanks for your help
# ---------- MySQL dump ----------
#
# Table structure for table 'WMS_Allocations'
#
CREATE TABLE WMS_Allocations (
Allocation_ID int(11) DEFAULT '' NOT NULL auto_increment,
Project_ID int(11) DEFAULT '0' NOT NULL ,
User_ID int(11) DEFAULT '0' NOT NULL ,
PRIMARY KEY (Allocation_ID),
KEY Project_ID (Project_ID,User_ID)
);
#
# Table structure for table 'WMS_Bookings'
#
CREATE TABLE WMS_Bookings (
Booking_ID int(11) DEFAULT '' NOT NULL auto_increment,
Booking_Date date DEFAULT '0000-00-00' NOT NULL ,
PCT_address varchar(255) , PCT_postcode varchar(255) , PCT_telephone varchar(255) , PCT_manager varchar(255) , PCT_gp varchar(255) , P_address varchar(255) , P_postcode varchar(255) , P_telephone varchar(255) ,
P_manager varchar(255) ,
P_gp varchar(255) ,
Allocation_ID int(11) ,
PRIMARY KEY (Booking_ID),
KEY Allocation_ID (Allocation_ID)
);
#
# Table structure for table 'WMS_Projects'
#
CREATE TABLE WMS_Projects (
Project_ID int(11) DEFAULT '' NOT NULL auto_increment,
Project_Name varchar(255) ,
PRIMARY KEY (Project_ID)
);
#
# Table structure for table 'WMS_User'
#
CREATE TABLE WMS_User (
User_ID int(11) DEFAULT '' NOT NULL auto_increment, User_Username varchar(100) DEFAULT '' NOT NULL , User_Password varchar(100) DEFAULT '' NOT NULL , User_Name varchar(100) DEFAULT '' NOT NULL , User_Type int(11) DEFAULT '0' NOT NULL , User_Email varchar(100) ,
PRIMARY KEY (User_ID),
UNIQUE User_Username (User_Username)
); Received on Mon Mar 24 2003 - 14:23:14 CET