CREATE TABLE Time(
Tipo VARCHAR(15) PRIMARY KEY,
DataInizio DATE,
DataFine DATE NOT NULL);
INSERT INTO Time VALUES('PreIscrizione', '2017-02-01', '2017-04-30');
INSERT INTO Time VALUES('Candidatura', '2017-05-01', '2017-07-30');
CREATE TABLE PreIscrizione(
Studente VARCHAR(16) REFERENCES Persona ON DELETE CASCADE ON UPDATE CASCADE PRIMARY KEY,
DataPreIscrizione DATE CHECK(DataPreIscrizione<(SELECT DataFine FROM Time WHERE Tipo = 'PreIscrizione')));
The table PreIscrizione allows to sign up a student, but it has to be done before a date indicated in the table Time. Obviously what i wrote above doesn't work, but it explains my idea. Which is the right way to solve this?
Related
I have the following table that joins driver and truck tables in order to assign trucks to drivers. I need to constraint entries that belong to the same driver on the same day, and DO NOT include the same truck code.
CREATE TABLE Assignments(
ID_CxC CHAR(3) NOT NULL PRIMARY KEY,
truck_code char(3) NOT NULL REFERENCES Trucks(truck_code),
driver_code char(5) NOT NULL REFERENCES Drivers(driver_code),
[date] DATE NOT NULL
);
INSERT Assignments
VALUES(1,1,1,'06-11-2021');
INSERT Assignments
VALUES(2,2,2,'06-11-2021');
INSERT Assignments
VALUES(3,3,3,'06-11-2021');
INSERT Assignments
VALUES(4,4,4,'06-11-2021');
INSERT Assignments
VALUES(5,5,5,'06-11-2021');
INSERT Assignments
VALUES(6,6,6,'06-11-2021');
INSERT Assignments
VALUES(7,1,1,'06-11-2021');
INSERT Assignments
VALUES(8,2,2,'06-11-2021');
INSERT Assignments
VALUES(9,3,3,'06-11-2021');
INSERT Assignments
VALUES(10,4,4,'06-11-2021');
It was suggested to create a boolean function to pass along dateval, truckval and driverval, and returns the following.
Not Exists (Select id_CxC From Assignments
Where Date = Dateval and Driver=Driverval
And Truck<>Truckval)
I have tried creating a function returning a bit datatype, but I honestly lack knowledge on user created functions, how would I go about passing the parameters for the function?
Is there an easier approach to the whole situation?
You clearly have two different entities -- but they are related. You have something like an "assignment" where a driver has a truck for one or more days. Then you have something like a "trip" where a driver uses the truck (what you are currently calling an "assignment").
So, I would model this as:
CREATE TABLE assignments (
ID_CxC CHAR(3) PRIMARY KEY,
truck_code char(3) NOT NULL REFERENCES Trucks(truck_code),
driver_code char(5) NOT NULL REFERENCES Drivers(driver_code),
date DATE NOT NULL,
UNIQUE (driver_code, date)
);
Note that there is only one row per driver and per date. Voila! Only one truck.
CREATE TABLE trips (
ID_trip INT IDENTITY(1, 1) PRIMARY KEY,
AssignmentId CHAR(3) NOT NULL REFERENCES Assignments(ID_CxC)
);
You can then add as many trips for a driver that you like, but for a given driver, they all have the same truck.
I want to create a stored procedure to update a column based on an amount of time. For example, to update the interest generated column every 15 days.
Here is my code. Please help.
create table Loan(
Loan_ID int not null primary key,
Loan_custID int not null foreign key references Customers(Cust_ID),
Loan_Amount int not null,
Loan_Interest int not null,
Loan_Date date not null unique,
)
Create table Interestgenerated(
IG_ID int not null primary key,
Loan_ID int not null foreign key references Loan1(Loan_ID),
Loan_Date date null foreign key references Loan1(Loan_Date),
IG_Amount int not null,
IG_Date datetime not null
)
create procedure InsertINtoInterestgenerated1
#PresentDate Datetime
as
set #PresentDate=getdate()
select Loan_ID from Loan
set IG_Date=Loan_Date
IG_Date=dateadd(day,15, IG_Date)
if #PresentDate=IG_Date
begin
update Interestgenerated1 set IG_Date = #PresentDate, IG_Amount=IG_Amount*0.15
end
Considering you want to automate the update of the value in column IG_Amount every 15 days,
you can schedule a job to run every 15 days at midnight like on the 1st and 16th of every month.
the below link might help you:
how to schedule a job for sql query to run daily?
I am creating a database in Oracle Application Express and am having a problem inserting a date into one of the tables.
INSERT INTO VIEWING( VIEWING_ID, VIEWING_DATE, TIME, PROPERTY_ID, AGENT_ID)
VALUES('3', '12-07-2015' ,'10:00','1', '101');
I've tried every combination of date format, and trying to force the date to my correct format
to_date('12-07-2015','MM-DD-YYYY')
But nothing is working
CREATE TABLE Viewing (
Viewing_ID number(10) NOT NULL,
Viewing_Date date NOT NULL,
Time timestamp(7) NOT NULL,
Property_ID number(10) NOT NULL,
Agent_ID number(10) NOT NULL,
PRIMARY KEY (Viewing_ID));
ALTER TABLE Viewing ADD CONSTRAINT FK_Viewing_Agent_ID FOREIGN KEY (Agent_ID) REFERENCES Agent (Agent_ID);
ALTER TABLE Viewing ADD CONSTRAINT FK_Viewing_Property_ID FOREIGN KEY (Property_ID) REFERENCES Property (Property_ID);
Every Resource I have found suggests it is most likely a parsing or syntax error but so far nothing has helped.
I have a second table in the schema that I can insert dates into without a problem, the only difference on this table is that the date is required (I have tried making it nullable to test and I still get the same error)
I should point out that Im am completely new to Oracle and this is part of a study project. If I had I choice I would be using SQL Server! But Ive been at this for hours and think its time to admit defeat!
Thanks
It is due to TIME column, not VIEWING_DATE. This worked:
INSERT INTO VIEWING( VIEWING_ID, VIEWING_DATE, TIME, PROPERTY_ID, AGENT_ID)
VALUES(4, date '2015-12-07' , timestamp '2015-12-07 10:00:00',1, 101);
I am a beginner with SQL. I have created 4 tables and added data to my SHIP table. I am having some issues with inserting data into the CRUISE table. I get the error message at the bottom.
I have researched and can not figure out what i am doing wrong. Is there an issue with my sequence and/or trigger that is not allowing me to do this or is my syntax in the CREATE TABLE CRUISE causing the error? Everything i have done has been successful up until trying to insert the first column into the CRUISE table.
The tables:
CREATE TABLE SHIP
( Ship_Name VARCHAR2(100) PRIMARY KEY,
Ship_Size INTEGER,
Ship_Registry VARCHAR2(50),
Ship_ServEntryDate INTEGER,
Ship_PassCapacity INTEGER,
Ship_CrewCapacity INTEGER,
Ship_Lifestyle VARCHAR2(40),
CONSTRAINT Size_ck CHECK (Ship_Size > 0),
CONSTRAINT Registry_ck CHECK (Ship_Registry IN ('Norway','Liberia','The Netherlands','Bahamas'))
)
CREATE TABLE CRUISE (
Cruise_ID INTEGER Primary Key,
Ship_Name VARCHAR(100),
Cruise_DeptDate DATE NOT NULL,
Cruise_DeptCity VARCHAR(80) NOT NULL,
Cruise_Duration INTEGER,
FOREIGN KEY (Ship_Name) REFERENCES SHIP(Ship_Name)
)
CREATE TABLE PASSENGERS (
Pass_ID INTEGER PRIMARY KEY,
Pass_Name VARCHAR(100) NOT NULL,
Pass_City VARCHAR(80),
Pass_Telephone VARCHAR(15),
Pass_NextOfKin VARCHAR(100)
)
CREATE TABLE RESERVATIONS (
Pass_ID INTEGER NOT NULL,
Cruise_ID INTEGER NOT NULL,
Res_TotalCost NUMERIC(9,2),
Res_BalanceDue NUMERIC(9,2),
Res_SpecialRequest VARCHAR(30),
Res_Room VARCHAR(10),
FOREIGN KEY (Pass_ID) REFERENCES PASSENGERS(Pass_ID),
FOREIGN KEY (Cruise_ID) REFERENCES CRUISE(Cruise_ID),
CONSTRAINT Cost_ck CHECK (Res_TotalCost >= 0),
CONSTRAINT BalanceDue_ck CHECK (Res_BalanceDue >= 0),
CONSTRAINT SpecialRequest_ck CHECK (Res_SpecialRequest IN ('Vegetarian','Vegan','Low salt','Gluten free','Kosher','Other'))
)
The sequence/trigger is an attempt to auto number Cruise_ID.
Create SEQUENCE cruise_id_sq
START WITH 1
INCREMENT BY 1;
CREATE OR REPLACE TRIGGER cruise_id_t
BEFORE INSERT
ON CRUISE
REFERENCING NEW AS NEW
FOR EACH ROW
BEGIN
if(:new.Cruise_ID is null) then
SELECT cruise_id_sq.nextval
INTO :new.Cruise_ID
FROM dual;
end if;
END;
ALTER TRIGGER cruise_id_t ENABLE;
Inserting into SHIP is okay....
INSERT INTO SHIP
(Ship_Name, Ship_Size, Ship_Registry,Ship_ServEntryDate, Ship_PassCapacity,Ship_CrewCapacity,Ship_Lifestyle)
Values ('Carribean Princess',142000,'Liberia',1000,3100,1181,'Contemporary');
INSERT INTO SHIP
(Ship_Name, Ship_Size, Ship_Registry,Ship_ServEntryDate, Ship_PassCapacity,Ship_CrewCapacity,Ship_Lifestyle)
Values ('Carribean Sunshine',74000,'Norway',1992,1950,760,'Premium');
INSERT INTO SHIP
(Ship_Name, Ship_Size, Ship_Registry,Ship_ServEntryDate, Ship_PassCapacity,Ship_CrewCapacity,Ship_Lifestyle)
Values ('Ship of Dreams',70000,'Liberia',2004,1804,735,'Contemporary');
INSERT INTO SHIP
(Ship_Name, Ship_Size, Ship_Registry,Ship_ServEntryDate, Ship_PassCapacity,Ship_CrewCapacity,Ship_Lifestyle)
Values ('Sunshine of the Seas',74000,'The Netherlands',1990,2354,822,'Luxury');
Inserting into CRUISE fails...
INSERT INTO Cruise
(Ship_Name, Cruise_DeptDate,Cruise_DeptCity,CruiseDuration)
Values ('Sunshine of the Seas',25-may-15,'Miami',10);
Error starting at line : 1 in command - INSERT INTO Cruise (Ship_Name,
Cruise_DeptDate,Cruise_DeptCity,CruiseDuration) Values ('Sunshine of
the Seas',25-may-15,'Miami',10) Error at Command Line : 3 Column : 35
Error report - SQL Error: ORA-00984: column not allowed here
00984. 00000 - "column not allowed here"
*Cause:
*Action:
Oracle thinks that 25-may-15 is the expression 25 minus may minus 15. In looking up the value for may Oracle finds that there is nothing there. Thus the error.
You can, but probably don't want to, quote it like so, '25-may-15'. This will make a string that may or may not be implicitly converted to a date, depending on the settings of NLS_DATE_FORMAT and or NLS_TERRITORY.
To form a date independent of session setting one can use the TO_DATE function with explicit date format, to_date('25-may-15', 'DD-Mon-YY'). Another option is a date literal, date '2015-05-25', which is always YYYY-MM-DD no matter the session settings..
I am trying to make a procedure that takes makes potential empty "received" fields use the current date. I made a sequence called Order_number_seq that populates the order number (Ono) column. I don't know how to link errors in the orders table to a entry in the Orders_errors table.
this is what i have so far:
CREATE PROCEDURE Add_Order
AS BEGIN
UPDATE Orders
CREATE Sequence Order_number_seq
Start with 1,
Increment by 1;
UPDATE Orders SET received = GETDATE WHERE received = null;
These are the tables I am working with:
Orders table
(
Ono Number Not Null,
Cno Number Not Null,
Eno Number Not Null,
Received Date Null,
Shipped_Date Date Null,
Creation_Date Date Not Null,
Created_By VARCHAR2(10) Not Null,
Last_Update_Date Date Not Null,
Last_Updated_By VARCHAR2(10) Not Null,
CONSTRAINT Ono_PK PRIMARY KEY (Ono),
CONSTRAINT Cno_FK FOREIGN KEY (Cno)
REFERENCES Customers_Proj2 (Cno)
);
and
Order_Errors table
(
Ono Number Not Null,
Transaction_Date Date Not Null,
Message VARCHAR(100) Not Null
);
Any help is appreciated, especially on linking the orders table errors to create a new entry in OrderErrors table.
Thanks in advance.
Contrary to Martin Drautzburg's answer, there is no foreign key for the order number on the Order_Errors table. There is an Ono column which appears to serve that purpose, but it is not a foreign as far as Oracle is concerned. To make it a foreign key, you need to add a constraint much like the Cno_FK on Orders. An example:
CREATE TABLE Order_Errors
(
Ono Number Not Null,
Transaction_Date Date Not Null,
Message VARCHAR(100) Not Null,
CONSTRAINT Order_Errors_Orders_FK FOREIGN KEY (Ono) REFERENCES Orders (Ono)
);
Or, if your Order_Errors table already exists and you don't want to drop it, you can use an ALTER TABLE statement:
ALTER TABLE Order_Errors
ADD CONSTRAINT Order_Errors_Orders_FK FOREIGN KEY (Ono) REFERENCES Orders (Ono)
;
As for the procedure, I'm inclined to say what you're trying to do does not lend itself well to a PROCEDURE. If your intention is that you want the row to use default values when inserted, a trigger is better suited for this purpose. (There is some performance hit to using a trigger, so that's a consideration.)
-- Create sequence to be used
CREATE SEQUENCE Order_Number_Sequence
START WITH 1
INCREMENT BY 1
/
-- Create trigger for insert
CREATE TRIGGER Orders_Insert_Trigger
BEFORE INSERT ON Orders
FOR EACH ROW
DECLARE
BEGIN
IF :NEW.Ono IS NULL
THEN
SELECT Order_Number_Sequence.NEXTVAL INTO :NEW.Ono FROM DUAL;
END IF;
IF :NEW.Received IS NULL
THEN
SELECT CURRENT_DATE INTO :NEW.O_Received FROM DUAL;
END IF;
END;
/
This trigger will then be executed on every single row inserted into the Orders table. It checks if the Ono column was NULL and replaces it with an ID from the sequence if so. (Be careful that you don't ever provide an ID that will later be generated by the sequence; it will get a primary key conflict error.) It then checks if the received date is NULL and sets it to the current date, using the CURRENT_DATE function (which I believe was one of the things you were trying to figure out), if so.
(Side note: Other databases may not require a trigger to do this and instead could use a default value. I believe PostgreSQL, for instance, allows the use of function calls in its DEFAULT clauses, and that is how its SERIAL auto-increment type is implemented.)
If you are merely trying to update existing data, I would think the UPDATE statements by themselves would suffice. Is there a reason this needs to be a PROCEDURE?
One other note. Order_Errors has no primary key. You probably want to have an auto-incrementating surrogate key column, or at least create an index on its Ono column if you only ever intend to select off that column.
There are a number of confusing things in your question:
(1) You are creating a sequence inside a procedure. Does this even compile?
(2) Your procedure does not have any parameters. It just updates the RECEIVED column of all rows.
(3) You are not telling us what you want in the MESSAGE column.
My impression is that you should first go "back to the books" before you ask questions here.
As for your original question
how to link errors in the orders table to a entry in the Orders_errors
table.
This is aleady (correctly) done. The Orders_error table contains an ONO foreign key which points to an order.