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Add files via upload #1

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75 changes: 75 additions & 0 deletions Assignment answers for march 4_sql queries.txt
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Original file line number Diff line number Diff line change
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SELECT *
FROM Customers
WHERE City = "London"

---------------------

SELECT *
FROM customers
WHERE postalcode = "1010"

---------------------

SELECT *
FROM suppliers
WHERE supplierid = "11"

---------------------

SELECT *
FROM orders
ORDER BY orderdate DESC

---------------------

SELECT *
FROM suppliers
WHERE length(SupplierName) > 20

---------------------

SELECT *
FROM customers
WHERE customername LIKE '%market%'

----------------------

INSERT INTO customers (customername, contactname, address, city, postalcode, country)
VALUES ('The Shire', 'Bilbo Baggins', '1 Hobbit-Hole', 'Bag End', '111', 'Middle Earth')

---------------------

UPDATE customers
SET postalcode = '11122'
WHERE customerid = 92

--------------------

SELECT customername
FROM orders o, customers c
WHERE o.customerid = c.customerid
GROUP BY c.customername
ORDER BY c.customername

--------------------

SELECT customername, count(*) as Num_Of_Orders
FROM orders LEFT JOIN customers
ON orders.customerid = customers. customerid
GROUP BY orders.customerid
ORDER BY Num_OF_Orders DESC


--------------------

SELECT c.city, count(o.orderid) as orders
FROM orders o, customers c
WHERE o.customerid = c.customerid
GROUP BY c.city
ORDER BY c.city

--------------------

DELETE
FROM customers
WHERE customerid NOT IN (SELECT customerid FROM orders)
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