DBI310

“Rank orders by order value descending” “Return consecutive periods of activity” “Return the percent of the current order value out of the grand total, as well as the difference from the grand average” “Calculate bank account balances” “Calculate expected product stock levels/inventory” “Calculate how many days since the previous customer order and until the next” “Compute percentile ranks and percentiles to analyze the distribution of sales”

Set definition: By a "set" we mean any collection M into a whole of definite, distinct objects m (which are called the "elements" of M) of our perception or of our thought. -- Georg Cantor

-- percent of total and diff from average WITH CustAggregates AS ( SELECT custid, SUM(val) AS sumval, AVG(val) AS avgval FROM Sales.OrderValues GROUP BY custid ), GrandAggregates AS ( SELECT SUM(val) AS sumval, AVG(val) AS avgval FROM Sales.OrderValues ) SELECT O.orderid, O.custid, O.val, O.val / CA.sumval AS pctcust, O.val - CA.avgval AS diffcust, O.val / GA.sumval AS pctall, O.val - GA.avgval AS diffall FROM Sales.OrderValues AS O JOIN CustAggregates AS CA ON O.custid = CA.custid CROSS JOIN GrandAggregates AS GA;

-- percent of total and diff from average with filter SELECT orderid, custid, val, val / (SELECT SUM(O2.val) FROM Sales.OrderValues AS O2 WHERE O2.custid = O1.custid AND orderdate >= ' ' AND orderdate < ' ') AS pctcust, val - (SELECT AVG(O2.val) FROM Sales.OrderValues AS O2 WHERE O2.custid = O1.custid AND orderdate >= ' ' AND orderdate < ' ') AS diffcust, val / (SELECT SUM(O2.val) FROM Sales.OrderValues AS O2 WHERE orderdate >= ' ' AND orderdate < ' ') AS pctall, val - (SELECT AVG(O2.val) FROM Sales.OrderValues AS O2 WHERE orderdate >= ' ' AND orderdate < ' ') AS diffall FROM Sales.OrderValues AS O1 WHERE orderdate >= ' ' AND orderdate < ' ';

-- islands (e.g., consecutive periods of activity) SELECT MIN(col1) AS start_range, MAX(col1) AS end_range FROM (SELECT col1, (SELECT MIN(B.col1) FROM dbo.T1 AS B WHERE B.col1 >= A.col1 AND NOT EXISTS (SELECT * FROM dbo.T1 AS C WHERE C.col1 = B.col1 + 1)) AS grp FROM dbo.T1 AS A) AS D GROUP BY grp;

-- account balances SELECT S1.actid, S1.tranid, S1.val, SUM(S2.val) AS balance FROM dbo.Accounts AS S1 JOIN dbo.Accounts AS S2 ON S2.actid = S1.actid AND S2.tranid <= S1.tranid GROUP BY S1.actid, S1.tranid, S1.val;

Set Function -- account balances SELECT actid, tranid, val, SUM(val) OVER(PARTITION BY actid ORDER BY tranid ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS balance FROM dbo.Accounts;

orderid orderdate val rnk :00: :00: :00: :00: :00: SELECT orderid, orderdate, val, RANK() OVER(ORDER BY val DESC) AS rnk FROM Sales.OrderValues;

orderid orderdate val rnk :00: :00: :00: :00: :00: SELECT orderid, orderdate, val, RANK() OVER(ORDER BY val DESC) AS rnk FROM Sales.OrderValues;

-- percent of total and diff from average SELECT orderid, custid, val, val / SUM(val) OVER(PARTITION BY custid) AS pctcust, val - AVG(val) OVER(PARTITION BY custid) AS diffcust, val / SUM(val) OVER() AS pctall, val - AVG(val) OVER() AS diffall FROM Sales.OrderValues WHERE orderdate >= ' ' AND orderdate < ' ';

-- window functions SELECT orderid, custid, val, val / SUM(val) OVER(PARTITION BY custid) AS pctcust, val - AVG(val) OVER(PARTITION BY custid) AS diffcust, val / SUM(val) OVER() AS pctall, val - AVG(val) OVER() AS diffall FROM Sales.OrderValues WHERE orderdate >= ' ' AND orderdate < ' '; -- traditional SELECT orderid, custid, val, val / (SELECT SUM(O2.val) FROM Sales.OrderValues AS O2 WHERE O2.custid = O1.custid AND orderdate >= ' ' AND orderdate < ' ') AS pctcust, val - (SELECT AVG(O2.val) FROM Sales.OrderValues AS O2 WHERE O2.custid = O1.custid AND orderdate >= ' ' AND orderdate < ' ') AS diffcust, val / (SELECT SUM(O2.val) FROM Sales.OrderValues AS O2 WHERE orderdate >= ' ' AND orderdate < ' ') AS pctall, val - (SELECT AVG(O2.val) FROM Sales.OrderValues AS O2 WHERE orderdate >= ' ' AND orderdate < ' ') AS diffall FROM Sales.OrderValues AS O1 WHERE orderdate >= ' ' AND orderdate < ' ';

-- account balances SELECT actid, tranid, val, SUM(val) OVER(PARTITION BY actid ORDER BY tranid ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS balance FROM dbo.Accounts;

-- window functions SELECT actid, tranid, val, SUM(val) OVER(PARTITION BY actid ORDER BY tranid) AS balance FROM dbo.Accounts; -- traditional SELECT S1.actid, S1.tranid, S1.val, SUM(S2.val) AS balance FROM dbo.Accounts AS S1 JOIN dbo.Accounts AS S2 ON S2.actid = S1.actid AND S2.tranid <= S1.tranid GROUP BY S1.actid, S1.tranid, S1.val;

-- window functions SELECT custid, orderdate, orderid, DATEDIFF(day, LAG(orderdate) OVER(PARTITION BY custid ORDER BY orderdate, orderid), orderdate) AS diff FROM Sales.Orders; -- traditional SELECT custid, orderdate, orderid, DATEDIFF(day, (SELECT TOP (1) I.orderdate FROM Sales.Orders AS I WHERE I.custid = O.custid AND I.orderdate <= O.orderdate AND (I.orderdate < O.orderdate OR I.orderid < O.orderid) ORDER BY orderdate DESC, orderid DESC), orderdate) AS diff FROM Sales.Orders AS O;

-- traditional SELECT MIN(col1) AS start_range, MAX(col1) AS end_range FROM (SELECT col1, (SELECT MIN(B.col1) FROM dbo.T1 AS B WHERE B.col1 >= A.col1 AND NOT EXISTS (SELECT * FROM dbo.T1 AS C WHERE C.col1 = B.col1 + 1)) AS grp FROM dbo.T1 AS A) AS D GROUP BY grp; -- window functions SELECT MIN(col1) AS start_range, MAX(col1) AS end_range FROM (SELECT col1, col1 - ROW_NUMBER() OVER(ORDER BY col1) AS grp FROM dbo.T1) AS D GROUP BY grp;

Questions? Thank You!

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