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-----------------------------------------------------------0 SELECT STATEMENT Optimizer=CHOOSE (Cost=33 Card=1 Bytes=230) 1 0 HASH JOIN (Cost=33 Card=1 Bytes=230) 2 1 TABLE ACCESS (FULL) OF 'T1' (Cost=16 Card=15 Bytes=3330) 3 1 TABLE ACCESS (FULL) OF 'T2' (Cost=16 Card=3000 Bytes=24000) Note how the join cardinality has changed from 225 to just 1 because the index has been changed. Note, even more spectacularly, that the cardinality has been changed even though the execution plan doesn t even use the index! (I have an even more extraordinary example of this type of surprise in the script delete_anomaly.sql in the online code suite, where an execution plan changes because I create a bitmap index on a column that appears in the select list of a query I m not even going to try to think about why that one happens.) The problem with the descending index is that the existence of the index has caused the optimizer to generate a surprise extra predicate, which we can see if we switch from autotrace to dbms_xplan: -------------------------------------------------------------------| Id | Operation | Name | Rows | Bytes | Cost | -------------------------------------------------------------------| 0 | SELECT STATEMENT | | 1 | 230 | 33 | |* 1 | HASH JOIN | | 1 | 230 | 33 | |* 2 | TABLE ACCESS FULL | T1 | 15 | 3330 | 16 | | 3 | TABLE ACCESS FULL | T2 | 3000 | 24000 | 16 | -------------------------------------------------------------------Predicate Information (identified by operation id): --------------------------------------------------1 - access("T2"."N1"="T1"."N1" AND SYS_OP_DESCEND("T2"."N1")=SYS_OP_DESCEND("T1"."N1")) 2 - filter("T1"."N2"=45) In 9i, the optimizer includes the sys_op_descend() predicate in the selectivity calculation. In 10g, the optimizer recognizes (I assume) that the sys_op_descend() predicate is the same as t2.n1 = t1.n1, and therefore doesn t double-count the effect. vb.net ean 128 reader Packages matching GS1-128 - NuGet Gallery
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Generate, create EAN 128 in Visual Basic . NET applications; Easy to install & integrate barcode EAN 128 generation library SDK into VB . NET evelopments ... Crosstabs are useful because they are easy to understand, can be used with any level of data (nominal, ordinal, interval, or ratio), and provide greater insight than single statistics. Listing 14-1 gives the JRXML syntax for crosstabs. Listing 14-1. JRXML Syntax <!ELEMENT crosstab (reportElement, crosstabParameter*, parametersMapExpression , crosstabDataset , crosstabHeaderCell , rowGroup*, columnGroup*, measure*, crosstabCell*, whenNoDataCell )> <!ATTLIST crosstab isRepeatColumnHeaders (true | false) "true" isRepeatRowHeaders (true | false) "true" columnBreakOffset NMTOKEN "10" runDirection (LTR | RTL) "LTR" > word 2007 code 39 font, word ean 128, qr code font word free, birt barcode, birt data matrix, birt upc-a vb.net ean 128 reader .NET GS1 - 128 / EAN - 128 Generator for C#, ASP.NET, VB . NET ...
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VB . NET GS1-128 Generator for .NET class, Data Matrix, PDF417, QRCode, Code128, Code39. More important though, this expression illustrates a number of useful XPath functions: string(), in this case, converts the ID attribute node to its string value position() returns the position of the context element (in this case, each <User> being evaluated) last() returns the position of the last element in the context node (the context being the result of the previous location step evaluation; that is, the root <Friends> element) Note that a predicate (the part of an XPath expression appearing in square brackets) can appear in any or all location steps Here, a predicate selects the last <User> element so that you can access its ID attribute This element is converted to a string and shown in the results table This query isn t particularly useful in the context of our application, but it does show the power behind XPath expressions and the flexibility available for performing complex queries.. vb.net ean 128 reader GS1 128 Generator DLL in VB | Free . NET program sample code ...
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I suggest you use Google as there is a lot of information on the topic: http://en. lmgtfy.com/?q=ucc+ ean - 128 +barcode+generator[^]. —SA. If you feel a little uncomfortable with the way the previous pages have been describing and calculating join cardinalities, there is another way of looking at what goes on. It doesn t change what happens, or how the results drop out; it is just a different mental image that you could use to help you understand the way the arithmetic works. Consider the query from join_card_01.sql: select t1.v1, t2.v1 from t1, t2 As a final feature for our site, we are going to let the user enter a range of years, and query the uploaded file for matching nodes For this feature, instead of using XmlDocument class, you will use another class that implements a read-only in-memory representation of the document and that is highly optimized for XPath querying: XPathDocument When we introduced XmlDocument, we said it is an implementation of the W3C DOM standard As such, it s built around the concepts laid out in that specification Microsoft developers realized that the DOM is not particularly efficient at executing XPath queries because of the way it stores its information as collections of nodes containing child nodes, and so on They also discovered that many scenarios don t actually require a read/write representation, especially for query processing. where and and ; t1.filter = 1 t2.join1 = t1.join1 t2.filter = 1 -- 25 values -- 50 / 30 values -- 50 values We have such a scenario in our application already: reporting doesn t require any editing features As a result, the XPathDocument class was created It s a really simple class that contains nothing but a CreateNavigator() method (the implementation of IXPathNavigableCreateNavigator()) Once you have a navigator, you deal with queries and results in the same way as you did with an underlying XmlDocument That s the beauty of XPathNavigator and the modularization achieved in SystemXml! Try It Out: Query Based on User Input To allow execution based on user input, your code will build an XPath expression based on what s contained in the text boxes on the UploadListReport page when the Execute button is clicked It will use the values to filter the matching nodes and show them in the second (currently invisible) table on the page 1. vb.net gs1 128 Create GS1 - 128 Bar Codes with VB . NET - RasterEdge.com
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