Multiple nested statements - searching out erroneus posts

Question

Hi!
I have a problem which occurs when there are connection problems to the database and objects are not saved properly.
I have the following tables:
MEETING
MEETINGID
1
2
3
MEETING_CUSTOMERS
MEETINGID--------CUSTOMERID
1----------------------XXXX
1----------------------YYYY
1----------------------ZZZZ
2----------------------AAAA
3----------------------BBBB
SHOPPINGCART
SHOPPINGCARTID------------CUSTOMERID
1-----------------------------------AAAA
2-----------------------------------BBBB
3-----------------------------------XXXX
4-----------------------------------YYYY
5-----------------------------------ZZZZ
SHOPPINGCART_PRODUCTS
SHOPPINGCARTITEMID----------SHOPPINGCARTID-----------PARENTID
1----------------------------------------1-----------------------------------NULL
2----------------------------------------2-----------------------------------1
3----------------------------------------2-----------------------------------NULL
4----------------------------------------3-----------------------------------5
5----------------------------------------4-----------------------------------NULL
6----------------------------------------5-----------------------------------NULL
MEETINGID is PK in MEETING and FK in MEETING_CUSTOMERS, one meeting can have many customers. One customer can only be in one salesmeeting.
SHOPPINGCARTID is PK i SHOPPINGCART and FK in SHOPPINGCART_PRODUCTS, one shoppingcart can have many products. One customer can only have one shoppingcart. PARENTID is a reference to another SHOPPINGCARTITEMID
So, when the connection problem occurs, the link bonding customers in a salesmeeting is broken so two customers who were in the same salesmeeting when I first started to work with the errand, are now separated. Without going in to details on how this affects my application, it is not good.
So now I want to write a script that in pseudocode does something like this:
List MEETING_CUSTOMERS with customers who has a SHOPPINGCART where there are SHOPPINGCART_PRODUCTS that has a PARENTID-reference to another SHOPPINGCART_PRODUCT which is in a SHOPPINGCART belonging to another customer who is NOT in the same SALESMEETING. Also print rows in the other MEETING_CUSTOMERS.
In the example above, customer AAAA and customer BBBB are i different MEETING's but in customer BBBB's SHOPPINGCART there is a SHOPPINGCART_PRODUCT with a reference (PARENTID) to a SHOPPINGCART_PRODUCT in customer AAAA's SHOPPINGCART. In the other case where PARENTID is not null, everything is correct because the customer with the referenced SHOPPINGCART_PRODUCT is in the same MEETING.
So, the output would be:
2----------------------AAAA
3----------------------BBBB
I hope you follow my thought here, if not, just ask me and I will try to give a better explanation =)
Thanks!
/Paul

Answer 1

Yepps!
MEETING
CREATE TABLE "MEETING"
(     "MEETINGID" NUMBER NOT NULL ENABLE,
     CONSTRAINT "MEETINGID_PK" PRIMARY KEY ("MEETINGID")
USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS
STORAGE(INITIAL 1054720 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
ENABLE
MEETING_CUSTOMERS
CREATE TABLE "MEETING_CUSTOMERS"
(     "MEETINGID" NUMBER NOT NULL ENABLE,
     "CUSTOMERID" VARCHAR2(12 BYTE) NOT NULL ENABLE,
     CONSTRAINT "MEETING_CUSTOMERS_PK" PRIMARY KEY ("MEETINGID", "CUSTOMERID")
USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
ENABLE,
     CONSTRAINT "CUSTOMERID_UNIQUE_2" UNIQUE ("CUSTOMERID")
USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
ENABLE,
     CONSTRAINT "MEETING_CUSTOMERS_FK" FOREIGN KEY ("MEETINGID")
     REFERENCES "MEETING" ("MEETINGID") ON DELETE CASCADE ENABLE
CART
CREATE TABLE "CART"
(     "CARTID" NUMBER NOT NULL ENABLE,
     "CUSTOMERID" VARCHAR2(15 BYTE),
     CONSTRAINT "CART_PK" PRIMARY KEY ("CARTID")
USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
ENABLE,
     UNIQUE ("CUSTOMERID")
USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
ENABLE
) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
STORAGE(INITIAL 1048576 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT);
CART_PRODUCT
CREATE TABLE "CART_PRODUCT"
(     "PRODUCTID" NUMBER NOT NULL ENABLE,
     "CARTID" NUMBER,
     "PARENTID" NUMBER,
     PRIMARY KEY ("PRODUCTID")
USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
ENABLE,
     FOREIGN KEY ("CARTID")
     REFERENCES "CART" ("CARTID") ON DELETE CASCADE ENABLE
) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
STORAGE(INITIAL 4194304 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT);
-- INSERTING into MEETING
Insert into MEETING (MEETINGID) values (1);
Insert into MEETING (MEETINGID) values (2);
Insert into MEETING (MEETINGID) values (3);
-- INSERTING into MEETING_CUSTOMERS
Insert into MEETING_CUSTOMERS (MEETINGID,CUSTOMERID) values (1,'XXXX');
Insert into MEETING_CUSTOMERS (MEETINGID,CUSTOMERID) values (1,'YYYY');
Insert into MEETING_CUSTOMERS (MEETINGID,CUSTOMERID) values (1,'ZZZZ');
Insert into MEETING_CUSTOMERS (MEETINGID,CUSTOMERID) values (2,'AAAA');
Insert into MEETING_CUSTOMERS (MEETINGID,CUSTOMERID) values (3,'BBBB');
-- INSERTING into CART
Insert into CART (CARTID,CUSTOMERID) values (1,'AAAA');
Insert into CART (CARTID,CUSTOMERID) values (2,'BBBB');
Insert into CART (CARTID,CUSTOMERID) values (3,'XXXX');
Insert into CART (CARTID,CUSTOMERID) values (4,'YYYY');
-- INSERTING into CART_PRODUCT
Insert into CART_PRODUCT (PRODUCTID,CARTID,PARENTID) values (1,1,null);
Insert into CART_PRODUCT (PRODUCTID,CARTID,PARENTID) values (2,2,1);
Insert into CART_PRODUCT (PRODUCTID,CARTID,PARENTID) values (3,2,null);
Insert into CART_PRODUCT (PRODUCTID,CARTID,PARENTID) values (4,3,5);
Insert into CART_PRODUCT (PRODUCTID,CARTID,PARENTID) values (5,4,null);
Insert into CART_PRODUCT (PRODUCTID,CARTID,PARENTID) values (6,5,null);
And version of the database....hmm, that I do not know, how do I find out? I'm using SQL-developer 1.2.1
/Paul
Insert into CART (CARTID,CUSTOMERID) values (5,'ZZZZ');