Initial commit

notes/database-prog/sql-scripts/2024-01-24.sql

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+-- T-SQL
+-- Keywords - UPPERCASE, Tables/Columns/etc - PascalCase, everything else - doesn't matter
+-- Comments with double-hyphen
+USE AP
+GO
+
+SELECT VendorID, VendorName, LEFT(VendorName, 10) VendorShortName,
+    VendorAddress1, VendorAddress2, VendorCity
+FROM Vendors
+
+-- batch run everything before it
+-- GO 2
+
+SELECT *
+FROM Terms
+
+SELECT InvoiceID, InvoiceNumber, InvoiceTotal, PaymentTotal, CreditTotal,
+    CASE PaymentTotal
+		WHEN InvoiceTotal THEN 1
+		ELSE 0
+	END IsPaidFull
+FROM Invoices
+
+-- includes credit
+SELECT InvoiceID, InvoiceNumber, InvoiceTotal, PaymentTotal, CreditTotal, InvoiceTotal - CreditTotal PaidTotal,
+    CASE PaymentTotal
+		WHEN InvoiceTotal - CreditTotal THEN 1
+		ELSE 0
+	END IsPaidFull
+FROM Invoices
+
+-- better
+SELECT TOP 500
+InvoiceID, InvoiceNumber, InvoiceTotal, PaymentTotal, CreditTotal, InvoiceTotal - CreditTotal PaidTotal,
+    CASE WHEN PaymentTotal = InvoiceTotal - CreditTotal THEN 1
+		ELSE 0
+	END IsPaidFull
+FROM Invoices
+ORDER BY VendorID, InvoiceDueDate
+
+SELECT TOP 50 InvoiceID, VendorID FROM Invoices
+ORDER BY VendorID
+
+-- 2024-01-29
+
+-- paging
+-- skip first offset rows, return next fetch rows
+SELECT InvoiceID, InvoiceNumber, InvoiceDueDate
+FROM Invoices
+ORDER BY InvoiceDueDate
+OFFSET 110 ROWS
+FETCH NEXT 10 ROWS ONLY
+
+-- Filtering
+-- just return what you need, instead of filtering in the application
+SELECT InvoiceID, VendorID, InvoiceDueDate, InvoiceTotal
+FROM Invoices
+-- Note that equality is a single equals sign
+WHERE InvoiceTotal >= 1000 OR VendorID = 110
+ORDER BY VendorID, InvoiceDueDate
+
+SELECT VendorID, VendorName, VendorCity, VendorState
+FROM Vendors
+-- Note strings use apostrephes, not quotation marks
+-- Keep in mind *there is no short-circuit evaluation*, so this will run every single thing and it's messy and slow
+--WHERE VendorState = 'CA' OR VendorState = 'AZ' OR VendorState = 'OH' OR VendorState = 'NY'
+-- Instead, use IN
+WHERE VendorState IN ('CA', 'AZ', 'OH', 'NY')
+ORDER BY VendorName
+
+SELECT InvoiceID, InvoiceNumber, InvoiceTotal
+FROM Invoices
+--WHERE InvoiceTotal >= 100 AND InvoiceTotal <= 500
+--less typing and more optimized
+--keep in mind it's an inclusive between, not exclusive
+WHERE InvoiceTotal BETWEEN 100 AND 500
+ORDER BY InvoiceDueDate
+
+-- Haven't paid
+-- if either VendorAddress1 or VendorAddress2 are `NULL`, then the concatenation will just be `NULL`
+-- so this filters out all the nulls
+-- (note that the VendorAddress1 one isn't actually needed because the dataset doesn't contain any that has VendorAddress1 as `NULL` but VendorAddress2 defined)
+SELECT VendorID, VendorName, VendorAddress1, VendorAddress2, VendorAddress1 + ' ' + VendorAddress2 FROM Vendors
+WHERE VendorAddress1 IS NOT NULL AND VendorAddress2 IS NOT NULL
+-- or ISNULL to just return a string instead of NULL
+SELECT VendorID, VendorName, VendorAddress1, VendorAddress2, ISNULL(VendorAddress1, '') + ' ' + ISNULL(VendorAddress2, '') FROM Vendors
+-- or COALESCE
+SELECT VendorID, VendorName, VendorAddress1, VendorAddress2, COALESCE(VendorAddress1, '') + ' ' + COALESCE(VendorAddress2, '') FROM Vendors
+
+-- All vendors with PO Boxes
+SELECT VendorID, VendorName, VendorAddress1, VendorAddress2 FROM Vendors
+-- '%PO BOX%' is equivalent to '.*PO BOX.*' in regex
+WHERE VendorAddress1 LIKE '%PO BOX%' OR VendorAddress2 LIKE '%PO BOX%'
+
+-- Get current date
+--SELECT GETDATE(), GET UTCDATE()
+-- Get all invoices for January
+SELECT InvoiceId, InvoiceNumber, InvoiceDueDate FROM Invoices
+WHERE MONTH(InvoiceDueDate) = 1
+--WHERE DAY(InvoiceDueDate) IN (30, 31)
+-- Get all invoices for 2019
+--WHERE YEAR(InvoiceDeDate) = 2019
+-- More efficient version, also more flexible, but longer
+--WHERE InvoiceDueDate BETWEEN '1/1/2019' AND '12/31/2019'
+

notes/database-prog/sql-scripts/2024-01-31.sql

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+-- #### Start of class stuff ####
+
+-- Get the InvoiceId, InvoiceTotal, and InvoiceDueDate for all invoices for vendor 110
+SELECT InvoiceId, InvoiceTotal, InvoiceDueDate
+FROM Invoices
+WHERE VendorID = 110
+
+-- Get the latest 10 invoices for vendor 123: InvoiceId, InvoiceDueDate, InvoiceTotal
+SELECT TOP 10 InvoiceId, InvoiceTotal, InvoiceDueDate
+FROM Invoices
+WHERE VendorID = 123
+ORDER BY InvoiceDueDate DESC
+
+-- Get the InvoiceId, VendorId, InvoiceDueDate, and InvoiceTotal for all invoices due between 1/1/2020 and 1/31/2020
+SELECT InvoiceId, VendorId, InvoiceDueDate, InvoiceTotal
+FROM Invoices
+WHERE InvoiceDueDate BETWEEN '1/1/2020' AND '1/31/2020'
+
+-- ######################################################################## --