我是这个网站的新手，我希望我能以正确的方式提出问题
-- Create a Database table to represent the "FACT" entity.
CREATE TABLE FACT
(
Time_id DATE NOT NULL,
Area_id INTEGER NOT NULL,
Reported_crime_id INTEGER NOT NULL,
Crime_status VARCHAR(8) NOT NULL,
no_of_crime INTEGER NOT NULL,
Max_crime INTEGER NOT NULL,
Avg_crime INTEGER NOT NULL,
Min_crime INTEGER NOT NULL,
date_reported DATE NOT NULL,
-- Specify the PRIMARY KEY constraint for table "FACT".
-- This indicates which attribute(s) uniquely identify each row of data.
CONSTRAINT pk_fact PRIMARY KEY (Time_id, Area_id, Reported_crime_id,
Crime_status)
);
-- Create a Database table to represent the "Crime_Dim" entity.
CREATE TABLE Crime_Dim
(
REPORTED_CRIME_ID INTEGER NOT NULL,
CRIME_TYPE_Desc VARCHAR(50),
DATE_REPORTED DATE NOT NULL,
Crime_type_id INTEGER NOT NULL,
-- Specify the PRIMARY KEY constraint for table "Crime_Dim".
-- This indicates which attribute(s) uniquely identify each row of data.
CONSTRAINT pk_crime_dim PRIMARY KEY (REPORTED_CRIME_ID)
);
-- Create a Database table to represent the "Location_Dim" entity.
CREATE TABLE Location_Dim
(
AREA_ID INTEGER NOT NULL,
AREA_Name VARCHAR(30) NOT NULL,
Area_code INTEGER NOT NULL,
Force_id INTEGER NOT NULL,
-- Specify the PRIMARY KEY constraint for table "Location_Dim".
-- This indicates which attribute(s) uniquely identify each row of data.
CONSTRAINT pk_location_dim PRIMARY KEY (AREA_ID)
);
-- Create a Database table to represent the "Time_Dim" entity.
CREATE TABLE Time_Dim
(
Time_id INTEGER NOT NULL,
day_id INTEGER NOT NULL,
Month_id INTEGER NOT NULL,
Year INTEGER,
-- Specify the PRIMARY KEY constraint for table "Time_Dim".
-- This indicates which attribute(s) uniquely identify each row of data.
CONSTRAINT pk_time_dim PRIMARY KEY (Time_id)
);
-- Create a Database table to represent the "Reported_crime_dim" entity.
CREATE TABLE Reported_crime_dim
(
Crime_status VARCHAR(20) NOT NULL,
Date_reported DATE NOT NULL,
-- Specify the PRIMARY KEY constraint for table "Reported_crime_dim".
-- This indicates which attribute(s) uniquely identify each row of data.
CONSTRAINT pk_reported_crime_dim PRIMARY KEY (Crime_status)
);
-- i.e. tables may be referenced before they have been created. This method is therefore safer.
-- Alter table to add new constraints required to implement the "FACT_Time_Dim" relationship
-- This constraint ensures that the foreign key of table "FACT"
-- correctly references the primary key of table "Time_Dim"
ALTER TABLE FACT
ADD CONSTRAINT fk1_fact_to_time_dim FOREIGN KEY(Time_id) REFERENCES Time_Dim(
Time_id) ON DELETE RESTRICT ON UPDATE RESTRICT;
-- Alter table to add new constraints required to implement the "FACT_Location_Dim" relationship
-- This constraint ensures that the foreign key of table "FACT"
-- correctly references the primary key of table "Location_Dim"
ALTER TABLE FACT
ADD CONSTRAINT fk2_fact_to_location_dim FOREIGN KEY(AREA_ID) REFERENCES
Location_Dim(AREA_ID) ON DELETE RESTRICT ON UPDATE RESTRICT;
-- Alter table to add new constraints required to implement the "FACT_Crime_Dim" relationship
-- This constraint ensures that the foreign key of table "FACT"
-- correctly references the primary key of table "Crime_Dim"
ALTER TABLE FACT
ADD CONSTRAINT fk3_fact_to_crime_dim FOREIGN KEY(REPORTED_CRIME_ID) REFERENCES
Crime_Dim(REPORTED_CRIME_ID) ON DELETE RESTRICT ON UPDATE RESTRICT;
-- Alter table to add new constraints required to implement the "FACT_Reported_crime_dim" relationship
-- This constraint ensures that the foreign key of table "FACT"
-- correctly references the primary key of table "Reported_crime_dim"
ALTER TABLE FACT
ADD CONSTRAINT fk4_fact_to_reported_crime_dim FOREIGN KEY(Crime_status)
REFERENCES Reported_crime_dim(Crime_status) ON DELETE RESTRICT ON UPDATE
RESTRICT;
--------------------------------------------------------------
-- End of DDL file auto-generation
--------------------------------------------------------------
有人可以帮我纠正上面的SQL代码中的错误吗？当我运行最后几个代码中提到的代码时，我需要创建约束以防止Fact表中的外键并将它们与原始表关联，如果我有这个权利的话...... 有人可以更正代码，让我知道PLZ