asp.net c# qr code generator Inside Microsoft SQL Server 2008: T-SQL Querying in C#.NET

Printer QR Code in C#.NET Inside Microsoft SQL Server 2008: T-SQL Querying

Inside Microsoft SQL Server 2008: T-SQL Querying
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To x the problem, of course, you should use the correct name for the column from Orders that holds the shipper ID shippperid:
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SELECT shipper_id, companyname FROM Sales.MyShippers AS S WHERE shipper_id NOT IN (SELECT shipperid FROM Sales.Orders AS O WHERE custid = 43);
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This generates the following expected result:
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shipper_id companyname ----------- ---------------------------------------1 Shipper GVSUA
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However, to avoid such bugs in the future, it s a good practice to always include the table name or alias for all attributes in a subquery, even when the subquery is self-contained. Had I aliased the shipper_id column in the subquery (as shown in the following code), a name resolution error would have been generated, and the bug would have been detected:
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SELECT shipper_id, companyname FROM Sales.MyShippers AS S WHERE shipper_id NOT IN (SELECT O.shipper_id FROM Sales.Orders AS O WHERE O.custid = 43); Msg 207, Level 16, State 1, Line 4 Invalid column name 'shipper_id'.
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Finally, correcting the bug, here s how the solution query should look:
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SELECT shipper_id, companyname FROM Sales.MyShippers AS S WHERE shipper_id NOT IN (SELECT O.shipperid FROM Sales.Orders AS O WHERE O.custid = 43);
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When you re done, run the following code for cleanup:
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IF OBJECT_ID('Sales.MyShippers', 'U') IS NOT NULL DROP TABLE Sales.MyShippers;
Uncommon Predicates
In addition to IN and EXISTS, SQL has three more predicates, but they are rarely used: ANY, SOME, and ALL. You can consider them to be generalizations of the IN predicate. (ANY and SOME are synonyms with no logical difference between them.) An IN predicate is translated to a series of equality predicates separated by OR operators for example, v IN(x, y, z) is translated to v = x OR v = y OR v = z. ANY (or SOME) allows you to
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Subqueries, Table Expressions, and Ranking Functions
specify the comparison you want in each predicate, not limiting you to the equality operator. For example, v < ANY(x, y, z) is translated to v < x OR v < y OR v < z. ALL is similar, but it s translated to a series of logical expressions separated by AND operators. For example, v <> ALL(x, y, z) is translated to v <> x AND v <> y AND v <> z.
Note IN allows as input either a list of literals or a subquery returning a single column. ANY/SOME
and ALL support only a subquery as input. If you have the need to use these uncommon predicates with a list of literals as input, you must convert the list to a subquery. So, instead of v <> ANY(x, y, z), you would use v <> ANY(SELECT x UNION ALL SELECT y UNION ALL SELECT z) or v <> ANY(SELECT i FROM(VALUES(x),(y),(z)) AS D(i)).
To demonstrate the use of these uncommon predicates, let s suppose you are asked to return, for each employee, the order with the minimum orderid. Here s how you can achieve this with the ANY operator:
SELECT orderid, custid, empid, orderdate FROM Sales.Orders AS O1 WHERE NOT orderid > ANY(SELECT orderid FROM Sales.Orders AS O2 WHERE O2.empid = O1.empid);
This query generates the following output:
orderid ----------10248 10249 10250 10251 10255 10258 10262 10265 10289 custid ----------85 79 34 84 68 20 65 7 11 empid ----------5 6 4 3 9 1 8 2 7 orderdate ----------------------2006-07-04 00:00:00.000 2006-07-05 00:00:00.000 2006-07-08 00:00:00.000 2006-07-08 00:00:00.000 2006-07-12 00:00:00.000 2006-07-17 00:00:00.000 2006-07-22 00:00:00.000 2006-07-25 00:00:00.000 2006-08-26 00:00:00.000
A row has the minimum orderid for an employee if it is not the case that orderid is less than or equal to some orderid for the same employee. You can also write a query using ALL to achieve the same thing:
SELECT orderid, custid, empid, orderdate FROM Sales.Orders AS O1 WHERE orderid <= ALL(SELECT orderid FROM Sales.Orders AS O2 WHERE O2.empid = O1.empid);
A row has the minimum orderid for an employee if its orderid is less than or equal to all orderids for the same employee.
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