Need help in writin a trigger---Very Urgent

Question

Help me in creating the trigger with below specifications.
"We want to reject record deletions where DATE_APPROVED_PROV is not null or NLA_PROV_DONE is not null
We want to reject updates where (DATE_APPROVED_PROV is not null or NLA_PROV_DONE is not null)
and
(any of CAPEX or RFS or ALLOCATIONS or DEPR_START_DATE is different before update than it would be after update)"
Defination of Table is below :
CREATE TABLE ir_data
(record_id NUMBER(12,0) NOT NULL,
request_title VARCHAR2(255),
cio VARCHAR2(30),
host_country VARCHAR2(20),
ben_project_name VARCHAR2(255),
application VARCHAR2(80),
req_summary VARCHAR2(500),
external_ref VARCHAR2(255),
submitted_by VARCHAR2(60),
approved_by_prov VARCHAR2(60),
date_approved_prov DATE,
approved_by_final VARCHAR2(60),
date_approved_final DATE,
nla_prov_done DATE,
nla_final_done DATE,
cost_alloc_method VARCHAR2(255),
capex NUMBER(12,0) DEFAULT 0,
allocations NUMBER(12,0) DEFAULT 0,
rfs NUMBER(12,0) DEFAULT 0,
ben_budget_id VARCHAR2(20),
delete_flag VARCHAR2(1),
amortisation NUMBER(12,0) DEFAULT 0
depr_start_date DATE,
fy_allocations NUMBER(12,0),
wusys VARCHAR2(1))

Answer 1

Help me in creating the trigger with below
specifications.
"We want to reject record deletions where
DATE_APPROVED_PROV is not null or NLA_PROV_DONE is
not null
We want to reject updates where (DATE_APPROVED_PROV
is not null or NLA_PROV_DONE is not null)
and
(any of CAPEX or RFS or ALLOCATIONS or
DEPR_START_DATE is different before update than it
would be after update)"
Defination of Table is below :
CREATE TABLE ir_data
(record_id NUMBER(12,0) NOT
NULL,
request_title VARCHAR2(255),
cio VARCHAR2(30),
host_country VARCHAR2(20),
ben_project_name VARCHAR2(255),
application VARCHAR2(80),
req_summary VARCHAR2(500),
external_ref VARCHAR2(255),
submitted_by VARCHAR2(60),
approved_by_prov VARCHAR2(60),
date_approved_prov DATE,
approved_by_final VARCHAR2(60),
date_approved_final DATE,
nla_prov_done DATE,
nla_final_done DATE,
cost_alloc_method VARCHAR2(255),
capex NUMBER(12,0) DEFAULT
0,
allocations NUMBER(12,0)
DEFAULT 0,
rfs NUMBER(12,0)
DEFAULT 0,
ben_budget_id VARCHAR2(20),
delete_flag VARCHAR2(1),
amortisation NUMBER(12,0)
DEFAULT 0
depr_start_date DATE,
fy_allocations NUMBER(12,0),
wusys VARCHAR2(1))(any of CAPEX or RFS or ALLOCATIONS or DEPR_START_DATE is different before update than it would be after update)
I think if any of these change during an update do something. Not sure what. Probably reject, because that is what the other 2 requirements are.
Is this for an homework assignment?
Jim P.