keep getting an error on the line where I put my values in, it specifically appears on the "15" of "15 Water Road", same line as VALUES. The error states:
"Syntax Error: Missing closing parenthesis".
Also when I try run it on XAMPP I get:
"You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'Water Rd, 0412345678, 750, 3), (2, Smith, 2, 14 Water Rd, 0412345679, 400, 4),"
Extremely new to DB's and SQL, any help would be much appreciated.
CREATE TABLE Customer_info (
CustomerID int,
LastName varchar(50),
Username int,
Address varchar(777),
PhoneNumber int,
TotalSpent int,
OrdersCompleted int
);
INSERT INTO Customer_info (CustomerID, LastName, Username, Address, PhoneNumber, TotalSpent, OrdersCompleted)
VALUES (1, Mason, 1, 15 Water Rd, 0412345678, 750, 3), (2, Smith, 2, 14 Water Rd, 0412345679, 400, 4),
(3, Lens, 3, 1 Water rd, 0412345671, 700, 7), (4, Marks, 4, 5 Fire Rd, 0412345672, 100, 1),
(5, Barr, 5, 19 Fire Rd, 0412345673, 500, 1), (6, Blok, 6, 21 Fire Rd, 0412345674, 1000, 10),
(7, Pume, 7, 21 Water Rd, 0412345675, 1000, 2), (8, Po, 8, 77 Earth Rd, 0412345676, 1000, 4),
(9, Adid, 9, 20 Earth Rd, 0412345677, 2, 200), (10, Lew, 10, 6 Earth Rd, 0412345679, 250, 1),
(11, Chia, 11, 1 Earth Rd, 0412345681, 150, 1), (12, Barrett, 12, 11 Wind Rd, 0412345682, 450, 9),
(13, James, 13, 9 Wind Rd, 0412345683, 250, 10), (14, Foop, 14, 2 Window St, 0412345684, 200, 10),
(15, Watch, 15, 8 Window St, 0412345685, 1200, 1), (16, Irving, 16, 11 Window St, 0412345686, 1400, 2),
(17, Jones, 17, 22 Window St, 0412345687, 1600, 2);
You should enclose the non-numeric values with (single) quotation marks.
The error here is slightly cryptic, but what's going on is that when the DB engine tries to parse what you're inserting, it doesn't know how these characters should be used - for example, whether the commas are part of the string or not (remember, it doesn't know that an address field is unlikely to contain commas).
You are not enclosing varchar elements inside quotes, hence address values is read wrongly and error is thrown, enclose last name and address in quotes and insert this would solve the problem
INSERT INTO Customer_info (CustomerID, LastName, Username, Address, PhoneNumber, TotalSpent, OrdersCompleted) VALUES (1, 'Mason', 1, '15 Water Rd', 0412345678, 750, 3),(1, 'Mason', 1, '15 Water Rd', 0412345678, 750, 3);
<?php
CREATE TABLE Customer_info (
CustomerID int,
LastName varchar(50),
Username int,
Address varchar(777),
PhoneNumber int,
TotalSpent int,
OrdersCompleted int
);
"INSERT INTO Customer_info('CustomerID','LastName','Username','Address','PhoneNumber','TotalSpent','OrdersCompleted')VALUES
('1', 'Mason','1','15 Water Rd','0412345678','750','3'),
('2', 'Smith','2','14 Water Rd','0412345679','400','4'),
('3', 'Lens','3','1 Water rd','0412345671','700','7'),
('4', 'Marks','4','5 Fire Rd','0412345672','100','1'),
('5', 'Barr', '5', '19 Fire Rd','0412345673','500','1'),
('6','Blok','6','21 Fire Rd','0412345674','1000','10'),
('7','Pume','7','21 Water Rd','0412345675','1000','2'),
('8','Po','8','77 Earth Rd','0412345676','1000','4'),
('9','Adid','9','20 Earth Rd','0412345677','2','200'),
('10', 'Lew', '10','6 Earth Rd','0412345679', '250', '1'),
('11','Chia','11','1 Earth Rd','0412345681','150','1'),
('12','Barrett','12','11 Wind Rd','0412345682','450','9'),
('13','James','13','9 Wind Rd','0412345683','250','10'),
('14', 'Foop','14','2 Window St','0412345684','200', '10'),
('15','Watch','15','8 Window St','0412345685','1200','1'),
('16', 'Irving', '16', '11 Window St', '0412345686', '1400', '2'),
('17', 'Jones', '17', '22 Window St', '0412345687', '1600', '2')";
?>
Related
I have these tables below along with the definition. I want to find top 10 products sold in a year after finding counts and without using aggregation and in an optimized way. I want to know if aggregation is still needed or I can accomplish it without using aggregation. Below is the query. Can anyone suggest a better approach.
CREATE TABLE Customer (
id int not null,
first_name VARCHAR(30),
last_name VARCHAR(30),
Address VARCHAR(60),
State VARCHAR(30),
Phone text,
PRIMARY KEY(id)
);
CREATE TABLE Product (
ProductId int not null,
name VARCHAR(30),
unitprice int,
BrandID int,
Brandname varchar(30),
color VARCHAR(30),
PRIMARY KEY(ProductId)
);
Create Table Sales (
SalesId int not null,
Date date,
Customerid int,
Productid int,
Purchaseamount int,
PRIMARY KEY(SalesId),
FOREIGN KEY (Productid) REFERENCES Product(ProductId),
FOREIGN KEY (Customerid) REFERENCES Customer(id)
)
Sample Data:
insert into
Customer(id, first_name, last_name, address, state, phone)
values
(1111, 'andy', 'johnson', '123 Maryland Heights', 'MO', 3211451234),
(1112, 'john', 'smith', '237 Jackson Heights', 'TX', 3671456534),
(1113, 'sandy', 'fleming', '878 Jersey Heights', 'NJ', 2121456534),
(1114, 'tony', 'anderson', '789 Harrison Heights', 'CA', 6101456534)
insert into
Product(ProductId, name, unitprice, BrandId, Brandname)
values
(1, 'watch',200, 100, 'apple'),
(2, 'ipad', 429, 100, 'apple'),
(3, 'iphone', 799, 100, 'apple'),
(4, 'gear', 300, 110, 'samsung'),
(5, 'phone',1000, 110, 'samsung'),
(6, 'tab', 250, 110, 'samsung'),
(7, 'laptop', 1300, 120, 'hp'),
(8, 'mouse', 10, 120, 'hp'),
(9, 'monitor', 400, 130, 'dell'),
(10, 'keyboard', 40, 130, 'dell'),
(11, 'dvddrive', 100, 130, 'dell'),
(12, 'dvddrive', 90, 150, 'lg')
insert into
Sales(SalesId, Date, CustomerID, ProductID, Purchaseamount)
values (30, '01-10-2019', 1111, 1, 200),
(31, '02-10-2019', 1111, 3, 799),
(32, '03-10-2019', 1111, 2, 429),
(33, '04-10-2019', 1111, 4, 300),
(34, '05-10-2019', 1111, 5, 1000),
(35, '06-10-2019', 1112, 7, 1300),
(36, '07-10-2019', 1112, 9, 400),
(37, '08-10-2019', 1113, 5, 2000),
(38, '09-10-2019', 1113, 4, 300),
(39, '10-10-2019', 1113, 3, 799),
(40, '11-10-2019', 1113, 2, 858),
(41, '01-10-2020', 1111, 1, 400),
(42, '02-10-2020', 1111, 2, 429),
(43, '03-10-2020', 1112, 7, 1300),
(44, '04-10-2020', 1113, 7, 2600),
(45, '05-10-2020', 1114, 7, 1300),
(46, '06-10-2020', 1114, 7, 1300),
(47, '07-10-2020', 1114, 9, 800)
Tried this:
SELECT PCY.Name, PCY.Year, PCY.SEQNUM
FROM (SELECT P.Name AS Name, Extract('Year' from S.Date) AS YEAR, COUNT(P.Productid) AS CNT,
RANK() OVER (PARTITION BY Extract('Year' from S.Date) ORDER BY COUNT(P.Productid) DESC) AS RANK
FROM Sales S inner JOIN
Product P
ON S.Productid = P.Productid
) PCY
WHERE PCY.RANK <= 10;
I am seeing this error:
ERROR: column "p.name" must appear in the GROUP BY clause or be used in an aggregate function
LINE 2: FROM (SELECT P.Name AS Name, Extract('Year' from S.Date) AS ...
^
SQL state: 42803
Character: 52
I don't understand why you don't want to use an aggregate function when you have to aggregate over your data. This query works fine, without any issues on the GROUP BY:
WITH stats AS (
SELECT EXTRACT
( YEAR FROM DATE ) AS y,
P.productid,
P.NAME,
COUNT ( * ) numbers_sold,
RANK ( ) OVER ( PARTITION BY EXTRACT ( YEAR FROM DATE ) ORDER BY COUNT ( * ) DESC ) r
FROM
product
P JOIN sales S ON S.Productid = P.Productid
GROUP BY
1,2
)
SELECT y
, name
, numbers_sold
FROM stats
WHERE r <= 10;
This works because the productid is the primary key that has a functional dependency to the product name.
By the way, tested on version 12, but it should work on older and newer versions as well.
Good evening everyone,
I'm working on a assignment and can't figure out the following, I have two tables:
CREATE TABLE Rental (
rental_id DECIMAL(12) PRIMARY KEY,
customer_id DECIMAL(12),
movie_id DECIMAL(12),
delivery_status VARCHAR(64),
return_status VARCHAR(64));
and
CREATE TABLE Movie (
movie_id DECIMAL(12) PRIMARY KEY,
DVD_id INTEGER NOT NULL,
title VARCHAR(64) NOT NULL,
stock_number DECIMAL(12),
director_id DECIMAL(12),
genre_id DECIMAL(12),
release_date DATE NOT NULL,
restrictions VARCHAR(256) NOT NULL);
I need to do the following, list the names of all movies that are currently unavailable, rented and not yet returned. And this is my query:
SELECT Movie.movie_id, Movie.title, Movie.stock_number
FROM Movie
WHERE (Movie.movie_id, Movie.stock_number) NOT IN (
SELECT Rental.movie_id,
COUNT(Rental.return_status) AS number_of_unreturned
FROM Rental
WHERE Rental.return_status = 'Unreturned'
GROUP BY Rental.movie_id
HAVING COUNT (Rental.return_status) > 1) AND Movie.stock_number = 0;
I definitely have movies in Movie table that are not "Unreturend" but I get no rows selected all the time. Any advices or directions to think would be appreciated. Thanks!
I edited this post and added the content of the tables.
INSERT INTO Movie VALUES (1, 1, 'Amblin', 1, 1, 1, CAST('18-Dec-1968' AS DATE), 'G');
INSERT INTO Movie VALUES (2, 2, 'Duel', 2, 1, 2, CAST('13-Nov-1971' AS DATE), 'R');
INSERT INTO Movie VALUES (3, 3, 'Something Evil ', 3, 1, 3, CAST('21-Jan-1972' AS DATE), 'R');
INSERT INTO Movie VALUES (4, 4, 'The Sugarland Express ', 4, 1, 4, CAST('05-Apr-1974' AS DATE), 'PG13');
INSERT INTO Movie VALUES (5, 5, 'Jaws', 5, 1, 3, CAST('20-Jun-1975' AS DATE), 'R');
INSERT INTO Movie VALUES (6, 6, 'Close Encounters of the Third Kind', 6, 1, 5, CAST('16-Nov-1977' AS DATE), 'PG13');
INSERT INTO Movie VALUES (7, 7, ' 1941', 7, 1, 6, CAST('14-Dec-1979' AS DATE), 'G');
INSERT INTO Movie VALUES (8, 8, 'Raiders of the Lost Ark', 8, 1, 7, CAST('12-Jun-1981' AS DATE), 'PG13');
INSERT INTO Movie VALUES (9, 9, 'E.T. the Extra-Terrestrial', 9, 1, 5, CAST('11-Jun-1982' AS DATE), 'PG13');
INSERT INTO Movie VALUES (10, 10, 'Twilight Zone: The Movie', 10, 1, 3, CAST('24-Jun-1983' AS DATE), 'R');
INSERT INTO Movie VALUES (11, 11, 'Indiana Jones and the Temple of Doom', 11, 1, 7, CAST('23-May-1984' AS DATE), 'PG13');
INSERT INTO Movie VALUES (12, 12, 'The Color Purple', 12, 1, 4, CAST('18-Dec-1985' AS DATE), 'G');
INSERT INTO Movie VALUES (13, 13, 'Empire of the Sun', 13, 1, 4, CAST('25-Dec-1987' AS DATE), 'G');
INSERT INTO Movie VALUES (14, 14, 'Always', 14, 1, 4, CAST('22-Dec-1989' AS DATE), 'G');
INSERT INTO Movie VALUES (15, 15, 'Indiana Jones and the Last Crusade', 15, 1, 7, CAST('24-May-1989' AS DATE), 'G');
INSERT INTO Movie VALUES (16, 16, 'Hook', 16, 1, 8, CAST('11-Dec-1991' AS DATE), 'G');
INSERT INTO Movie VALUES (17, 17, 'Jurassic Park ', 17, 1, 5, CAST('11-Jun-1993' AS DATE), 'PG13');
INSERT INTO Movie VALUES (18, 18, 'Schindler''s List', 18, 1, 4, CAST('15-Dec-1993' AS DATE), 'PG13');
INSERT INTO Movie VALUES (19, 19, 'The Lost World: Jurassic Park', 19, 1, 5, CAST('23-May-1997' AS DATE), 'PG13');
INSERT INTO Movie VALUES (20, 20, 'Amistad', 20, 1, 4, CAST('10-Dec-1997' AS DATE), 'PG13');
INSERT INTO Movie VALUES (21, 21, 'Saving Private Ryan', 21, 1, 4, CAST('24-Jul-1998' AS DATE), 'PG13');
INSERT INTO Movie VALUES (22, 22, 'A.I. Artificial Intelligence', 22, 1, 4, CAST('29-Jun-2001' AS DATE), 'PG13');
INSERT INTO Movie VALUES (23, 23, 'Minority Report', 23, 1, 7, CAST('21-Jun-2002' AS DATE), 'PG13');
INSERT INTO Movie VALUES (24, 24, 'Catch Me If You Can', 24, 1, 8, CAST('25-Dec-2002' AS DATE), 'PG13');
INSERT INTO Movie VALUES (25, 25, ' The Terminal', 25, 1, 4, CAST('18-Jun-2004' AS DATE), 'G');
INSERT INTO Movie VALUES (26, 26, 'War of the Worlds', 26, 1, 5, CAST('29-Jun-2005' AS DATE), 'PG13');
INSERT INTO Movie VALUES (27, 27, 'Munich', 27, 1, 4, CAST('23-Dec-2005' AS DATE), 'PG13');
INSERT INTO Movie VALUES (28, 28, 'Indiana Jones and the Kingdom of the Crystal Skull', 28, 1, 7, CAST('22-May-2008' AS DATE), 'PG13');
INSERT INTO Movie VALUES (29, 29, 'The Adventures of Tintin', 28, 1, 7, CAST('21-Dec-2011' AS DATE), 'PG13');
INSERT INTO Movie VALUES (30, 30, 'War Horse', 30, 1, 4, CAST('25-Dec-2011' AS DATE), 'PG13');
INSERT INTO Movie VALUES (31, 31, 'Lincoln', 31, 1, 4, CAST('09-Nov-2012' AS DATE), 'PG13');
INSERT INTO Movie VALUES (32, 32, 'Bridge of Spies', 32, 1, 4, CAST('16-Oct-2015' AS DATE), 'PG13');
INSERT INTO Movie VALUES (33, 33, 'The BFG', 33, 1, 8, CAST('01-Jul-2016' AS DATE), 'PG13');
INSERT INTO Movie VALUES (34, 34, 'Praying with Anger', 34, 2, 5, CAST('12-Sep-1992' AS DATE), 'PG13');
INSERT INTO Movie VALUES (35, 35, 'Wide Awake', 35, 2, 4, CAST('20-Mar-1998' AS DATE), 'G');
INSERT INTO Movie VALUES (36, 36, 'The Sixth Sense', 36, 2, 2, CAST('06-Aug-1999' AS DATE), 'PG13');
INSERT INTO Movie VALUES (37, 37, 'Unbreakable', 37, 2, 2, CAST('22-Nov-2000' AS DATE), 'PG13');
INSERT INTO Movie VALUES (38, 38, 'Signs', 38, 2, 2, CAST('02-Aug-2002' AS DATE), 'PG13');
INSERT INTO Movie VALUES (39, 39, 'The Village', 39, 2, 2, CAST('30-Jul-2004' AS DATE), 'PG13');
INSERT INTO Movie VALUES (40, 40, 'Lady in the Water', 40, 2, 8, CAST('21-Jul-2006' AS DATE), 'PG13');
INSERT INTO Movie VALUES (41, 41, 'The Happening', 41, 2, 2, CAST('13-Jun-2008' AS DATE), 'R');
INSERT INTO Movie VALUES (42, 42, 'The Last Airbender', 42, 2, 7, CAST('02-Jul-2010' AS DATE), 'G');
INSERT INTO Movie VALUES (43, 43, 'After Earth', 43, 2, 7, CAST('31-May-2013' AS DATE), 'G');
INSERT INTO Movie VALUES (44, 44, 'The Visit', 44, 2, 3, CAST('11-Sep-2015' AS DATE), 'R');
INSERT INTO Movie VALUES (45, 45, 'Split', 45, 2, 2, CAST('20-Jan-2017' AS DATE), 'PG13');
and
INSERT INTO Rental VALUES (sequence_rental.NEXTVAL, 1, 1, 'Delivered', 'Unreturned');
INSERT INTO Rental VALUES (sequence_rental.NEXTVAL, 2, 1, 'Delivered', 'Unreturned');
INSERT INTO Rental VALUES (sequence_rental.NEXTVAL, 3, 6, 'Delivered', 'Unreturned');
INSERT INTO Rental VALUES (sequence_rental.NEXTVAL, 4, 7, 'Delivered', 'Unreturned');
INSERT INTO Rental VALUES (sequence_rental.NEXTVAL, 2, 2, 'Delivered', 'Unreturned');
INSERT INTO Rental VALUES (sequence_rental.NEXTVAL, 2, 37, 'Delivered', 'Unreturned');
INSERT INTO Rental VALUES (sequence_rental.NEXTVAL, 5, 1, 'Delivered', 'Unreturned');
INSERT INTO Rental VALUES (sequence_rental.NEXTVAL, 5, 24, 'Delivered', 'Unreturned');
INSERT INTO Rental VALUES (sequence_rental.NEXTVAL, 5, 3, 'Delivered', 'Unreturned');
INSERT INTO Rental VALUES (sequence_rental.NEXTVAL, 6, 13, 'Delivered', 'Unreturned');
INSERT INTO Rental VALUES (sequence_rental.NEXTVAL, 6, 2, 'Delivered', 'Unreturned');
INSERT INTO Rental VALUES (sequence_rental.NEXTVAL, 6, 8, 'Delivered', 'Unreturned');
INSERT INTO Rental VALUES (sequence_rental.NEXTVAL, 6, 1, 'Delivered', 'Unreturned');
INSERT INTO Rental VALUES (sequence_rental.NEXTVAL, 5, 2, 'Delivered', 'Unreturned');
INSERT INTO Rental VALUES (sequence_rental.NEXTVAL, 5, 3, 'Delivered', 'Unreturned');
INSERT INTO Rental VALUES (sequence_rental.NEXTVAL, 3, 27, 'Delivered', 'Returned');
Sorry if that is a too long post.
I don't want to write the code since you are a student. I'll give some direction though. In your where clause you're comparing (movie.movie_id = rental.movie_id) and (movie.stock_number = count(rental.return_status). Comparing the stock_number to the count of returns is incorrect.
When returning columns from multiple tables, use a join. The in statement does a comparison. Count is not being returned.
Join movies and the "in" subquery on movie_id. Create an alias on the subquery so you can join it.
Add the count column to the topmost outer select
Please try, if this logic is correct, I did not quite understand column naming. You might change last row (having) to correct it.
SELECT
m.movie_id, m.title, m.stock_number -- Getting movie id, movie title, stock number
FROM Movie m -- from movie table
JOIN rental r
ON (m.movie_id = r.movie_id) -- joining rental table in movie_id
WHERE
r.return_status = 'Unreturned' -- where return_status is unreturned
GROUP BY
m.movie_id, m.title, m.stock_number -- grouping_by (same as select)
HAVING
SUM(r.movie_id) > m.stock_number; -- restricting group by quantity
To resolve the query try first to break it down in the components you need.
In this case you need to compare the number of rented movies against the stock of movies.
So write 2 separte queries:
1 - One that will provide the movie id and the number to movies in stock.
2 - Another for the movie id and the number of rentals. For this one you have to count the unretured.
After you have the two queries, you can use them as subqueries of a higer level query that treats each or these queries as a table joined by the common id field.
And add awhere clause comparing the stock with the counted field.
Example:
Table A: id, name, age
Table B: table_b_id, table_a_id, telephone, address
Query 1: select id, name, age from A
Query 2: select table_a_id, telephone, address from B
select Q1.id, Q1.name, Q1.age, Q2telephone, Q2.address
from
(select A.id, A.name, A.age from A) Q1,
(select B.table_a_id, B.telephone, B.address from B) Q2
where
Q1.id = Q2.table_a_id
I have a SQL Server table like this:
MenuID MenuName MenuColor
---------------------------------------
10 Daily Tickets Gray
15 Kids Ticket Dark Pink
20 Group Discount Dark Ash
11 Discount ticket Brown
17 Referral Ticket Beige
22 Frequent visitor Musturd
27 Annual Pass sky blue
25 Kids Pass Pink
24 free Ticket Yellow
This table has lot of records and more columns too..
Desired result - first four Menus should be ordered with pre-defined order (which I mentioned in my trial query) and remaining should be ordered ASC on MenuName column
Desired result set:
MenuID MenuName MenuColor
---------------------------------------
10 Daily Tickets Gray
27 Annual Pass sky blue
22 Frequent visitor Musturd
20 Group Discount Dark Ash
11 Discount ticket Brown
24 free Ticket Yellow
25 Kids Pass Pink
15 Kids Ticket Dark Pink
17 Referral Ticket Beige
This is the query I tried for this:
SELECT *
FROM tMenus m
ORDER BY
(CASE m.MenuName
WHEN 'Daily Tickets' THEN 1
WHEN 'Annual Pass' THEN 2
WHEN 'Frequent visitor' THEN 3
WHEN 'Group Discount' THEN 4
END), m.MenuName ASC;
However, this is not returning the result that I want. Please correct me where I am wrong.
Thanks
Perhaps you just need an else:
ORDER BY (CASE m.MenuName
WHEN 'Daily Tickets' THEN 1
WHEN 'Annual Pass' THEN 2
WHEN 'Frequent visitor' THEN 3
WHEN 'Group Discount' THEN 4
ELSE 5
END) , m.MenuName ASC;
Adding "DisplayOrder" to the actual table...
IF OBJECT_ID('tempdb..#Menue', 'U') IS NOT NULL
DROP TABLE #Menue;
CREATE TABLE #Menue (
MenuID INT NOT NULL PRIMARY KEY,
MenuName VARCHAR(30) NOT NULL,
MenuColor VARCHAR(10) NOT NULL,
DisplayOrder INT NOT NULL
);
INSERT #Menue(MenuID, MenuName, MenuColor, DisplayOrder) VALUES
(10,'Daily Tickets', 'Gray', 100),
(15,'Kids Ticket', 'Dark Pink', 800),
(20,'Group Discount', 'Dark Ash', 400),
(11,'Discount ticket', 'Brown', 500),
(17,'Referral Ticket', 'Beige', 900),
(22,'Frequent visitor', 'Musturd', 300),
(27,'Annual Pass', 'sky blue', 200),
(25,'Kids Pass', 'Pink', 700),
(24,'free Ticket', 'Yellow', 600);
-- Note: I'm leaving gaps in the DisplayOrder values.
-- This makes it easy to add new values and set their
-- values w/o having to adjust existing values.
SELECT
m.MenuID,
m.MenuName,
m.MenuColor
FROM
#Menue m
ORDER BY
m.DisplayOrder;
Edited answer...
IF OBJECT_ID('tempdb..#MenueDisplayOrder', 'U') IS NOT NULL
DROP TABLE #MenueDisplayOrder;
CREATE TABLE #MenueDisplayOrder (
MenueID INT NOT NULL, --add FK to Menues table
DisplayTypeID INT NOT NULL, --add FK to available Types table
DisplayOrder INT NOT NULL
PRIMARY KEY CLUSTERED (DisplayTypeID, MenueID)
);
INSERT #MenueDisplayOrder (MenueID, DisplayTypeID, DisplayOrder) VALUES
(10, 1, 100), (11, 1, 500), (15, 1, 800), (17, 1, 900), (20, 1, 400),
(22, 1, 300), (24, 1, 600), (25, 1, 700), (27, 1, 200),
(27, 2, 100), (25, 2, 500), (24, 2, 800), (20, 2, 900), (17, 2, 400),
(22, 2, 300), (15, 2, 600), (11, 2, 700), (10, 2, 200),
(15, 3, 100), (11, 3, 500), (10, 3, 800), (22, 3, 900), (24, 3, 400),
(17, 3, 300), (20, 3, 600), (27, 3, 700), (25, 3, 200);
SELECT
m.MenuID,
m.MenuName,
m.MenuColor
FROM
#Menue m
JOIN #MenueDisplayOrder mdo
ON m.MenuID = mdo.MenueID
WHERE
mdo.DisplayTypeID = 2 -- alter this value to change the display order.
ORDER BY
mdo.DisplayOrder;
I'm trying to create a calculated column in SQL. Basically I need to get a set of distinct dates and determine how many customers there are in the population on that particular date. The result should be something like:
Date______| Customers
2016-01-01 | 1
2016-01-01 | 2
2016-01-05 | 3
2016-02-09 | 4
etc.
I created a sample database & data (using MySQL as I don't have permission to create tables in our Oracle dbs) with the following script:
create database customer_example;
use customer_example;
create table customers (
customer_id int not null primary key,
customer_name varchar(255) not null,
term_date DATE);
create table employee (
employee_id int not null primary key,
employee_name varchar(255) not null);
create table cust_emp (
ce_id int not null AUTO_INCREMENT,
emp_id int not null,
cust_id int not null,
start_date date,
end_date date,
deleted_yn boolean,
primary key (emp_id, cust_id, ce_id),
foreign key (cust_id) references customers(customer_id),
foreign key (emp_id) references employee(employee_id));
insert into customers (customer_id, customer_name)
values (1, 'Bobby Tables'), (2, 'Grover Cleveland'), (3, 'Chester Arthur'), (4, 'Jan Bush'), (5, 'Emanuel Porter'), (6, 'Darren King'), (7, 'Casey Mcguire'), (8, 'Robin Simpson'), (9, 'Robin Tables'), (10, 'Mitchell Arnold');
insert into customers (customer_id, customer_name, term_date)
values (11, 'Terrell Graves', '2017-01-01'), (12, 'Richard Wagner', '2016-10-31'), (13, 'Glenn Saunders', '2016-11-19'), (14, 'Bruce Irvin', '2016-03-11'), (15, 'Glenn Perry','2016-06-06'), (16, 'Hazel Freeman', '2016-07-10'),
(17, 'Martin Freeman', '2016-02-11'), (18, 'Morgan Freeman', '2017-02-01'), (19, 'Dirk Drake', '2017-01-12'), (20, 'Fraud Fraud', '2016-12-31');
insert into employee (employee_id, employee_name)
values (1000, 'Cedrick French'), (1001, 'Jane Phillips'), (1002, 'Brian Green'), (1003, 'Shawn Brooks'), (1004, 'Clarence Thomas');
insert into cust_emp (emp_id, cust_id, start_date, end_date)
values (1000, 1, '2016-01-01', '2016-02-01'), (1000, 1, '2016-02-01', '2016-02-01'), (1000, 2,'2016-01-05', '2016-01-16'),(1000, 3,'2016-02-09', '2016-03-14'),(1000, 4,'2016-03-20', '2016-04-23'),
(1000, 5,'2016-01-01', '2016-01-16'),(1000, 6,'2016-01-01', '2016-01-16'),(1004, 7, '2016-01-14', '206-01-16'),
(1004, 8, '2016-01-13', '2016-01-16'),(1004, 9, '2016-01-05', '2016-01-16'), (1003, 12, '2016-04-21', '2016-11-30');
insert into cust_emp (emp_id, cust_id, start_date, deleted_yn)
values (1002, 11, '2016-04-10', TRUE),(1003, 10, '2016-01-16', FALSE), (1004, 12, '2016-04-20', TRUE), (1004, 12, '2016-04-19', FALSE), (1003, 13, '2016-06-06', TRUE), (1002, 14, '2016-06-10', TRUE),
(1004, 15, '2016-03-25', TRUE), (1004, 17, '2016-01-02', TRUE), (1004, 18, '2017-01-01', TRUE), (1004, 19, '2016-11-13', TRUE), (1004, 20, '2016-03-10', TRUE), (1004, 16, '2016-05-13', TRUE);
insert into cust_emp (emp_id, cust_id, start_date)
values (1002, 1, '2016-02-01'), (1004, 2, '2016-01-16'),(1003, 3, '2016-03-14'),(1002, 4, '2016-04-23'),(1004, 5, '2016-01-16'),(1002, 6, '2016-01-16'),(1004, 7, '2016-01-16'),
(1004, 8, '2016-01-16'),(1002, 9, '2016-01-16'), (1004, 10, '2016-01-16');
The following SQL works fine in MySQL but when I try it in Oracle, I get an 'invalid identifier' on 'dates':
select distinct(ce.start_date) as dates,
(select count(distinct(c.customer_id))
from customers c
inner join cust_emp ce on c.customer_id = ce.cust_id
where ce.start_date < dates
and (ce.end_date > dates or (ce.deleted_yn = false or ce.deleted_yn is null))
and (c.term_date > dates or c.term_date is null)
)
from cust_emp as ce;
It seems as though this is because the dates is too far in a subquery. I've tried a CTE as well, but that seems to have the same issue as it gave the same error. How can I re-write this so that I can assess how many customers were there for each date in Oracle?
Huh?
Isn't this what you want?
select ce.dates as dates, count(distinct c.customer_id)
from cust_emp ce join
customers c
on c.customer_id = ce.cust_id
where ce.start_date < ce.dates and
(ce.end_date > ce.dates or ce.deleted_yn = false or ce.deleted_yn is null) and
(c.term_date > ce.dates or c.term_date is null)
group by ce.dates
order by ce.dates;
I don't really understand the use of the subquery with select distinct. The logic you describe is more easily understood as a simple aggregation.
I'm not sure where dates comes from. It is not in your data model, but it is in your sample query.
The table: Flight (flight_num, src_city, dest_city, dep_time, arr_time, airfare, mileage)
I need to find the cheapest fare for unlimited stops from any given source city to any given destination city. The catch is that this can involve multiple flights, so for example if I'm flying from Montreal->KansasCity I can go from Montreal->Washington and then from Washington->KansasCity and so on. How would I go about generating this using a Postgres query?
Sample Data:
create table flight(
flight_num BIGSERIAL PRIMARY KEY,
source_city varchar,
dest_city varchar,
dep_time int,
arr_time int,
airfare int,
mileage int
);
insert into flight VALUES
(101, 'Montreal', 'NY', 0530, 0645, 180, 170),
(102, 'Montreal', 'Washington', 0100, 0235, 100, 180),
(103, 'NY', 'Chicago', 0800, 1000, 150, 300),
(105, 'Washington', 'KansasCity', 0600, 0845, 200, 600),
(106, 'Washington', 'NY', 1200, 1330, 50, 80),
(107, 'Chicago', 'SLC', 1100, 1430, 220, 750),
(110, 'KansasCity', 'Denver', 1400, 1525, 180, 300),
(111, 'KansasCity', 'SLC', 1300, 1530, 200, 500),
(112, 'SLC', 'SanFran', 1800, 1930, 85, 210),
(113, 'SLC', 'LA', 1730, 1900, 185, 230),
(115, 'Denver', 'SLC', 1500, 1600, 75, 300),
(116, 'SanFran', 'LA', 2200, 2230, 50, 75),
(118, 'LA', 'Seattle', 2000, 2100, 150, 450);
[this answer is based on Gordon's]
I changed arr_time and dep_time to TIME datatypes, which makes calculations easier.
Also added result columns for total_time and waiting_time. Note: if there are any loops possible in the graph, you will need to avoid them (possibly using an array to store the path)
WITH RECURSIVE segs AS (
SELECT f0.flight_num::text as flight
, src_city, dest_city
, dep_time AS departure
, arr_time AS arrival
, airfare, mileage
, 1 as hops
, (arr_time - dep_time)::interval AS total_time
, '00:00'::interval as waiting_time
FROM flight f0
WHERE src_city = 'SLC' -- <SRC_CITY>
UNION ALL
SELECT s.flight || '-->' || f1.flight_num::text as flight
, s.src_city, f1.dest_city
, s.departure AS departure
, f1.arr_time AS arrival
, s.airfare + f1.airfare as airfare
, s.mileage + f1.mileage as mileage
, s.hops + 1 AS hops
, s.total_time + (f1.arr_time - f1.dep_time)::interval AS total_time
, s.waiting_time + (f1.dep_time - s.arrival)::interval AS waiting_time
FROM segs s
JOIN flight f1
ON f1.src_city = s.dest_city
AND f1.dep_time > s.arrival -- you can't leave until you are there
)
SELECT *
FROM segs
WHERE dest_city = 'LA' -- <DEST_CITY>
ORDER BY airfare desc
;
FYI: the changes to the table structure:
create table flight
( flight_num BIGSERIAL PRIMARY KEY
, src_city varchar
, dest_city varchar
, dep_time TIME
, arr_time TIME
, airfare INTEGER
, mileage INTEGER
);
And to the data:
insert into flight VALUES
(101, 'Montreal', 'NY', '05:30', '06:45', 180, 170),
(102, 'Montreal', 'Washington', '01:00', '02:35', 100, 180),
(103, 'NY', 'Chicago', '08:00', '10:00', 150, 300),
(105, 'Washington', 'KansasCity', '06:00', '08:45', 200, 600),
(106, 'Washington', 'NY', '12:00', '13:30', 50, 80),
(107, 'Chicago', 'SLC', '11:00', '14:30', 220, 750),
(110, 'KansasCity', 'Denver', '14:00', '15:25', 180, 300),
(111, 'KansasCity', 'SLC', '13:00', '15:30', 200, 500),
(112, 'SLC', 'SanFran', '18:00', '19:30', 85, 210),
(113, 'SLC', 'LA', '17:30', '19:00', 185, 230),
(115, 'Denver', 'SLC', '15:00', '16:00', 75, 300),
(116, 'SanFran', 'LA', '22:00', '22:30', 50, 75),
(118, 'LA', 'Seattle', '20:00', '21:00', 150, 450);
You want to use a recursive CTE for this. However, you will have to make a decision about how many flights to include. The following (untested) query shows how to do this, limiting the number of flight segments to 5:
with recursive segs as (
select cast(f.flight_num as varchar(255)) as flight, src_city, dest_city, dept_time,
arr_time, airfare, mileage, 1 as numsegs
from flight f
where src_city = <SRC_CITY>
union all
select cast(s.flight||'-->'||cast(f.flight_num as varchar(255)) as varchar(255)) as flight, s.src_city, f.dest_city,
s.dept_time, f.arr_time, s.airfare + f.airfare as airfare,
s.mileage + f.mileage as milage, s.numsegs + 1
from segs s join
flight f
on s.src_city = f.dest_city
where s.numsegs < 5
)
select *
from segs
where dest_city = <DEST_CITY>
order by airfare desc
limit 1;
Something like this:
select * from
(select flight_num, airfare from flight where src_city = ? and dest_city = ?
union
select f1.flight_num || f2.flight_num, f1.airfare+f2.airfare
from flight f1, flight f2 where f1.src_city = ? and f2.dest_city = ? and f1.dest_city = f2.src_city
union
...
) s order by airfare desc
I didn't test that as I'm leaving that for you so there might be subtle problems that require testing. This is clearly homework since no airline plans things this way. So I don't mind leaving you extra work.