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