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As I mentioned earlier, SQL Server doesn t create distribution statistics or maintain accurate cardinality information for table variables as it does for temporary tables . This is one of the main factors you should consider when choosing a type of temporary object for a given task . The downside is that you might get inefficient plans when the optimizer needs to consult histograms to determine selectivity . This is especially a problem with big tables, where you might end up with excessive I/O . The upside is that table variables, for the very same reason, involve much fewer recompilations . Before making your choice, you need to figure out which is more expensive in the particular task for which you re designating the temporary object . To explain the statistics aspect of table variables in a more tangible way, I ll show you some queries, their execution plans, and their I/O costs . Examine the following code, and request an estimated execution plan for it from SQL Server Management Studio (SSMS): vb.net upc-a reader VB . NET UPC-A Barcode Reader SDK - Decode & Scan UPC-A ...
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Background. I originally built this application in VB . NET . While I was learning C#. ... To test this application, I bought a barcode scanner from Ebay for 5 dollars, ... DECLARE @T TABLE ( col1 INT NOT NULL PRIMARY KEY, col2 INT NOT NULL, filler CHAR(200) NOT NULL DEFAULT('a'), UNIQUE(col2, col1) ); INSERT INTO @T(col1, col2) SELECT n, (n - 1) % 10000 + 1 FROM dbo.Nums WHERE n <= 100000; SELECT * FROM @T WHERE col1 = 1; SELECT * FROM @T WHERE col1 <= 50000; SELECT * FROM @T WHERE col2 = 1; SELECT * FROM @T WHERE col2 <= 2; SELECT * FROM @T WHERE col2 <= 5000; 12 13 public ProductPriceDelegate(SOAPConnectionFactory cf) { ProductPriceDelegate try { constructor // Create a connection // from the connection factory looked up. con = cf.createConnection(); You can find the code to create and populate the Nums table in 2, User-Defined Functions . The estimated execution plans generated for these queries are shown in Figure 7-1 . 15 It returns the following structure (formatted for clarity): gs1-128 word, birt ean 128, birt report qr code, birt barcode generator, free upc barcode font for word, word code 128 vb.net upc-a reader .NET Barcode Reader Library | C# & VB . NET UPC-A Recognition ...
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NET UPC-A Generator, Creating and Adding UPC-A in VB . NET , ASP.NET Web Forms and Windows Forms applications, with detailed Developer Guide. <event name="sql_statement_completed" package="sqlserver" id="60" version="1" timestamp="2009-04-07T00:05:19.137Z"> <data name="source_database_id"> <value>10</value> <text /> </data> <data name="object_id"> <value>787488078</value> <text /> </data> <data name="object_type"> <value>20801</value> <text /> </data> <data name="cpu"> <value>218</value> <text /> </data> <data name="duration"> <value>4764272</value> <text /> </data> <data name="reads"> <value>5337</value> <text /> </data> <data name="writes"> <value>11</value> <text /> </data> <action name="database_id" package="sqlserver"> <value>10</value> <text /> </action> <action name="sql_text" package="sqlserver"> <value>SELECT * FROM Production.Products AS p CROSS JOIN Sales.OrderDetails AS od; </value> <text /> </action> </event> } catch(Exception e) { throw new IllegalStateException( "Unable to obtain JAXM connection."); } } /** Business method to obtain current pricing for a product. * @param productId The product's ID * @return Current price as a double */ public double getProductPrice(String productId) throws ProductPricingException { try { // Create a message factory from the connection MessageFactory mf = con.createMessageFactory(); // Create a message from the message factory. SOAPMessage msg = mf.createMessage(); // Message creation takes care of creating the SOAPPart SOAPPart sp = msg.getSOAPPart(); // Retrieve the envelope from the soap part SOAPEnvelope envelope = sp.getSOAPEnvelope(); // Create a soap header from the envelope. SOAPHeader hdr = envelope.createSOAPHeader(); // Create a soap body from the envelope. SOAPBody bdy = envelope.createSOAPBody(); vb.net upc-a reader UPC-A VB . NET DLL - Create UPC-A barcodes in VB . NET with valid ...
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RasterEdge . NET Image SDK contains a barcode reading plug-in library which can efficiently add UPC-A barcode scanning & detecting ability into your VB . In this XML structure, note that the standard columns are returned along with the two additional values database_id and sql_text that were added via our ACTION clause . It s worth noting at this point that the sql_text column returns the entire batch that was being executed, rather than just the SQL statement involved . If you haven t already, I m sure that at this point you ve started to realize that some skill manipulating XML is important for anyone wanting to develop advanced DBA skills in SQL Server . We can use the preceding log query as a derived table and extract relational values directly from it via the .value() method of the XML data type: SELECT EventLog.value('(/event[@name="sql_statement_completed"]/@timestamp)[1]', 'datetime') AS LogTime, EventLog.value('(/event/data[@name="reads"]/value)[1]', 'int') AS Reads, EventLog.value('(/event/action[@name="sql_text"]/value)[1]', 'varchar(max)') AS SQL_Text FROM ( SELECT CAST(event_data AS XML) AS EventLog FROM sys.fn_xe_file_target_read_file ('c:\temp\*.xel','c:\temp\*.xem',NULL,NULL) ) AS LogRecord ORDER BY LogTime; SOAPHeaderElement quoteDate = hdr.createSOAPHeaderElement("QuoteDate", Namespace.getNamespace("q", "http://www.mycompany.com/PriceQuote")); quoteDate.setMustUnderstand(true); quoteDate.addContent((new Date()).toString()); // Add a soap body element to the soap body SOAPBodyElement gpp = bdy.createSOAPBodyElement("GetProductPrice", Namespace.getNamespace("m", "MyCompany-URI")); gpp.createSOAPElement("productId", Namespace.getNamespace("m", "MyCompany-URI")) .addContent(productId); // Set the soap header and soap body on the envelope. envelope.setSOAPHeader(hdr); envelope.setSOAPBody(bdy); // Create an endpoint for the recipient of the message. Endpoint endPoint = new Endpoint("www.mysupplier.com"); // Get the price via RPC vb.net upc-a reader VB . NET UPC-A barcode Generator - ASP.NET Barcode Reader
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