79 lines
2.4 KiB
MySQL
79 lines
2.4 KiB
MySQL
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---- CHAPTER 4 ----
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-- Start-of-class problems --
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USE AP
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-- Get vendors who have default terms of greater than 1 months
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SELECT VendorName, VendorID, TermsDueDays
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FROM Vendors v
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JOIN Terms t ON t.TermsID = v.DefaultTermsID
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WHERE TermsDueDays > 30
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-- Get the contacts and contact updates for vendors 44, 75, and 94
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SELECT 'Current' TYPE, VendorID, VendorName, VendorContactLName, VendorContactFName
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FROM Vendors
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WHERE VendorID IN (44, 75, 94)
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-- UNION combines it as if it was one table, it can "update" the columns rather than add more
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UNION
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SELECT 'Updates' TYPE, VendorID, '', LastName, FirstName
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FROM ContactUpdates
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WHERE VendorID IN (44, 75, 94)
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-- Note that ORDER BY cannot be used on UNION queries, it's applied to the final query
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ORDER BY VendorID, TYPE
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-- Get invoices for all vendors except those in TX
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SELECT InvoiceID
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FROM Invoices
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-- Returns the query except for the stuff the matches the EXCEPT's query
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EXCEPT
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SELECT VendorID
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FROM Vendors
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WHERE VendorState = 'TX'
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------------------------------------------------------
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-- Temporary holiday table
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-- Common use for UNIONs, can act like a makeshift table
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SELECT '1/1/2024' DateValue, 'New Years Day' DateName
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UNION
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SELECT '1/15/2024', 'MLK Day'
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UNION
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SELECT '2/19/2024', 'Presidents Day'
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UNION
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SELECT '7/4/2024', 'Fourth of July'
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-- stuff
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USE WideWorldImporters
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SELECT CustomerID, CustomerName, c.BuyingGroupID
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FROM Sales.Customers c
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JOIN Sales.BuyingGroups bg ON c.BuyingGroupID = bg.BuyingGroupID
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ORDER BY CustomerName
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--------------------------------------------------------------------------------------------
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---- CHAPTER 5 ----
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USE AP
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-- Aggregates
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-- A function that's applied to all rows
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-- Count the number of invoices vendor 123 has
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-- it doesn't matter which column, so * is fine
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SELECT COUNT(*)
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FROM Invoices
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WHERE VendorId = 123
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-- How many invoices in 2019
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SELECT COUNT(*) TotalInvoices
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FROM Invoices
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WHERE YEAR(InvoiceDueDate) = 2019
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-- MIN, MAX
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-- returns the smallest and largest things
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-- can't mix and match aggregate functions with other stuff, this doesn't work
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SELECT VendorID, MIN(InvoiceTotal) SmallestInvoice, MAX(InvoiceTotal) LargestInvoice
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FROM Invoices
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WHERE YEAR(InvoiceDueDate) = 2020
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-- sum, average, min, and max invoice totals
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SELECT SUM(InvoiceTotal) SumOfInvoices, AVG(InvoiceTotal) AvgInvoice, MIN(InvoiceTotal) SmallestInvoice, MAX(InvoiceTotal) LargestInvoice
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FROM Invoices
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