c# print barcode labels Inside Microsoft SQL Server 2008: T-SQL Programming in .NET framework

Make QR in .NET framework Inside Microsoft SQL Server 2008: T-SQL Programming

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Here is the result of this query:
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supplierid ----------1 1 1 1 1 1 1 1 1 2 2 2 n ----------2 3 3 4 4 5 5 6 7 10 11 12 dr -------------------1 2 2 3 3 4 4 5 6 7 8 9 gf -------------------1 1 1 1 1 1 1 1 1 3 3 3
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You can see that the grouping factor is 1 for supplier 1 for time points 2 to 7, and 3 for supplier 2 for time points 10 to 12 . Now I can group by supplierid and grouping factor; the minimum time point per group will be the beginning and the maximum time point per group will be the ending time point of the interval of the group . The following query does the packing:
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WITH UnpackedCTE AS ( SELECT sd.supplierid, CAST(sd.during.ToString() AS CHAR(8)) AS CompleteInterval, dn.n, dn.d, N'(' + CAST(dn.n AS NVARCHAR(10)) + N':' + CAST(dn.n AS NVARCHAR(10)) + N')' AS UnpackedDuring FROM Production.Suppliers_Temp_During AS sd INNER JOIN dbo.DateNums AS dn ON dn.n BETWEEN sd.beginint AND sd.endint ), GroupingFactorCTE AS ( SELECT supplierid, n, DENSE_RANK() OVER (ORDER BY n) AS rn, n - DENSE_RANK() OVER(ORDER BY n) AS gf FROM UnpackedCTE ) SELECT supplierid, gf, N'(' + CAST(MIN(n) AS NVARCHAR(10)) + N':' + CAST(MAX(n) AS NVARCHAR(10)) + N')' AS packedduring FROM GroupingFactorCTE GROUP BY supplierid, gf ORDER BY supplierid, packedduring;
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The result of this query is the packed form of the Suppliers_Temp_Products table:
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supplierid ----------1 2 gf -------------------1 3 packedduring ----------------------(2:7) (10:12)
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Temporal Support in the Relational Model
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Note that in my query, the packedduring column actually isn t a IntervalCID column, but a string column that mimics IntervalCID s ToString() result . To completely implement the PACK operator, you should CAST the packedduring column to the IntervalCID data type . Now you can create a stored procedure for inserts and updates that will keep the data always in packed form . I will leave this exercise to you; I have a couple more issues to solve .
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Sixth normal Form in use
I have not solved two issues yet . How do I show that a contract is open-ended in a table with full temporal support How do I denote the moving point now in other words, how do I show which is the current version of the data for a given supplier I am going to use an approximation of the sixth normal form (6NF), proposed by C . J . Date, to solve those two issues . Additionally, with 6NF I will also solve the problem of maintaining history for every single attribute .
Horizontal and Vertical Decompositions
C . J . Date proposed solving both problems with something he called horizontal decomposition of the original Suppliers table into two tables: one with semitemporal and one with full temporal support . Namely, for 6NF, I need both the Suppliers_Since and the Suppliers_During tables . In the Suppliers_Since table, I can maintain the current state . In the Suppliers_During table, I can maintain history . According to Date s proposal, the since table should have no rows in common with the during table . When a contract with a supplier finishes, I can delete the row for this supplier from the Suppliers_Since table and add it to the Suppliers_During table . The Suppliers_Since table shows the current state, which is limited to the open-ended contracts, and the Suppliers_During table shows the history namely, all closed contracts . Therefore, the Suppliers_Since table shows current state without need for a special marker NOW . This kind of design can work well in many business scenarios . However, many additional issues arise . When a supplier appears for the first time, the supplier has to be inserted in the Suppliers_Since table . You have to start with open-ended contracts . The Suppliers_During table maintains history; you have to move the supplier from the Suppliers_Since table to Suppliers_During table when the contract finished . The question arises what if a supplier is under a closed contract immediately . You can insert this supplier in the Suppliers_Since table, showing since which time point the supplier is under contract, and move this supplier to the Suppliers_During table when the contract ends . However, while the contract is valid, while the supplier exists in the Suppliers_Since table, your database does not represent this business scenario correctly; you have not represented when the contract ends anywhere . Probably a better design would be to include three tables: Suppliers, Suppliers_Since, and Suppliers_During . You would have all suppliers in the Suppliers table; the Suppliers_Since would represent open-ended contracts, and Suppliers_During closed contracts . Of course,
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