What is the main reason behind using an index?


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source destination distance chennai bangalore 500 bangalore chennai 500 hyd delhi 1000 delhi hyd 1000 bangalore hyd 800 Here chennai to bangalore and bangalore to chennai is same distance. and hyd and delhi also same criteria. Based on the distance i want to display only one row using sql query?

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what are the tunnig tables you used for tuning a query and tell me some of coloumns in that tuning tables?

1 Answers   Metric Stream,


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