QUERY

Select query filters and ranking criteriaRef#72

A query is formulated as a set of desirable and essential criteria (attributes with specific values or range of values). The essential criteria are called filters - these help to eliminate (ineligible) candidate records. The desirable criteria are called ranking attributes - these help to order the matching candidates in descending order of merit (the reported candidates are limited to the number specified in each query - i.e. the no. of matched candidates to report per scan).
Usually every criterion is offered to you to choose as a filter and/or a ranking criterion (though there may be exceptions - i.e. the criteria may be used only in filters or only in ranking). Filter criteria - are of two types, the first list contains simple filters (single attributes) and the second contains special filters (combination of attributes).
Ranking criteria - are also of two types - simple & special. Each criteria that you select for ranking has to be assigned a weight - this helps to determine the extent of its influence in the total score of a matching candidate [the influence will depend on the individual criteria weight and the grand total of all weights for all criteria (the sum need not add upto 100, but if it does then the individual weights could be thought of as percentage weight; the weights assigned by you are normalised so you need not worry about the sum total being hundred)].
Master list or the catalogue of filters - this is the complete list of all available filters for you to choose from. Each filter pushes up the cost of processing. Some filters contain attributes that participate in multiple filters (especially special filters) - so you should be careful not to duplicate your attribute selection(s). For indicating selection please mark the checkbox.
Filter criteria name column is followed by the column of cost factor. The cost factor summation is used to classify the type of query - simple, advanced or complex - the rate is lowest for simple and highest for complex queries.
The next column shows the No.of occurrences Max(n,m) where n represents the max occurrences allowed in filter usage and m represents the max occurrences allowed in ranking usage of the criterion. You should skip or enter the no. of occurrences desired by you in your query construction by entering the appropriate number below the Filter and Rank columns. The last column is to enter the WEIGHT - you enter the weight only for ranking criterion and not if it is chosen only to serve as filter criterion. Normally you should be using filter(s) to set the outer bounds and ranking to discriminate those properties/values that qualify (pass the filter bounds).
It is advisable to go through the entire list of simple and special filters and ranking criteria before you exercise your choices. You should use filters cautiously because they eliminate matches. Donot select the same filter more than once.
You should read the specimen special filters and explanatory notes to completely understand the correct usage. Incorrect usage (conflicting values) or unnecessarily restrictive and complex conditions may eliminate good matches or generate irrelevant responses. Filters and ranking criteria afford a precision tool for you to control the selection process and obtain the best fit. You can fire multiple queries after changing criteria sets or values.

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