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SQLForExcelUsersPart18.sql
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SQLForExcelUsersPart18.sql
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--
-- The query that produces the data for Part 18 of the series.
--
SELECT FRS.SalesOrderNumber
,SUM(FRS.SalesAmount) AS SalesAmount
FROM FactResellerSales FRS
GROUP BY FRS.SalesOrderNumber
ORDER BY FRS.SalesOrderNumber
--
-- The following code snippet is not legit SQL!
--
WITH SalesOrders AS
(
SELECT FRS.SalesOrderNumber
,SUM(FRS.SalesAmount) AS SalesAmount
FROM FactResellerSales FRS
GROUP BY FRS.SalesOrderNumber
)
--
-- The SQL equivalent of Excel's IF function is the
-- mighty CASE WHEN. Write code to simulate what we
-- saw in Excel.
--
WITH SalesOrders AS
(
SELECT FRS.SalesOrderNumber
,SUM(FRS.SalesAmount) AS SalesAmount
FROM FactResellerSales FRS
GROUP BY FRS.SalesOrderNumber
)
SELECT SO.SalesOrderNumber
,SO.SalesAmount
,CASE
WHEN SO.SalesAmount > 8400 THEN 'Large'
ELSE 'Small'
END AS OrderSize
FROM SalesOrders SO
ORDER BY SO.SalesOrderNumber;
--
-- Handling multiple conditions with the mighty
-- CASE WHEN.
--
WITH SalesOrders AS
(
SELECT FRS.SalesOrderNumber
,SUM(FRS.SalesAmount) AS SalesAmount
FROM FactResellerSales FRS
GROUP BY FRS.SalesOrderNumber
)
SELECT SO.SalesOrderNumber
,SO.SalesAmount
,CASE
WHEN SO.SalesAmount < 1545 THEN 'Small'
WHEN SO.SalesAmount < 8400 THEN 'Medium'
WHEN SO.SalesAmount < 34234 THEN 'Large'
ELSE 'Extra Large'
END AS OrderSize
FROM SalesOrders SO
ORDER BY SO.SalesOrderNumber;
--
-- A totally contrived example to illustrate embedding a
-- CASE WHEN inside another CASE WHEN.
--
WITH SalesOrders AS
(
SELECT FRS.SalesOrderNumber
,SUM(FRS.SalesAmount) AS SalesAmount
FROM FactResellerSales FRS
GROUP BY FRS.SalesOrderNumber
)
SELECT SO.SalesOrderNumber
,SO.SalesAmount
,CASE
WHEN SO.SalesAmount < 1545 THEN
CASE
WHEN RIGHT(SO.SalesOrderNumber, 1) % 2 = 0 THEN 'Small Even'
ELSE 'Small Odd'
END
WHEN SO.SalesAmount < 8400 THEN 'Medium'
WHEN SO.SalesAmount < 34234 THEN 'Large'
ELSE 'Extra Large'
END AS OrderSize
FROM SalesOrders SO
ORDER BY SO.SalesOrderNumber;