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A query is a function designed to output a response. A filter is a restriction designed to weed out irrelevant or unwanted responses.

For example, if one were to Google information on monks, but not the television show Monk, one might parse the query as: monk -tv -"Tony Shalhoub". The first term would be the query, and the next two terms (each marked with a minus sign) would be the filters.

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Difference between SQL and OQL?

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Not exactly. A query is much more powerful. Essentially it can filter records, but queries can do all sorts of other things that filters cannot do. A filter will reduce down the amount of records you see by apply a condition. You can then scroll through the visible records. A query can do the same thing, but it will give you a list of the records. It can deal with more complex conditions and do many other things like delete records, change values in records, build new tables and many other things that filters cannot do. You would use a filter for simple things, like to filter out all the people working in a particular department, but would use a query for something more complex like to show the people working in a particular department, who are earning a certain amount of pay and have worked in the company for more than a certain amount of years.


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Related Questions

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