Transcription of 064-29: Creating Efficient SQL - Union Join without …
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064-29: Creating Efficient SQL - Union Join without …
Paper 064-29 Creating Efficient SQL - Union Join without the Union ClausePaul D Sherman, San Jose, CAABSTRACTF ollowing good object oriented practice of building query models we address the issue of poor query performance during useof the Union clause. Although column-wise joins are rather well understood, the notion of the Union or row-wise join isoften perceived incorrectly as a gluing together of independent fullselect result sets rather than via model relations throughhigher levels of abstraction. This perception is excusable because there often does not exist suitable abstraction tables ornormalization key values, and we must think creatively how a necessary abstraction can be derived. In the example to followwe help farmer Jack analyze taste and laboratory test data to determine the quality of his bean Level: Novice to Advanced, familiarity with SAS/ACCESS, SAS/CONNECT, Data step merge and Proc SQL pass-through the four taboo Schema Query Language keywords probably the one most dangerous to query performance is the Union clause(1).
Paper 064-29 Creating Efficient SQL - Union Join without the Union Clause Paul D Sherman, San Jose, CA ABSTRACT Following good object oriented practice of building query models we address the issue of poor query performance during use
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