An expression is the part of a query that specifies the conditions. For example, you can create an expression to specify all parcels whose area is larger than 4000 square feet. A query containing that expression displays or selects only parcels that meet those criteria.
A complete query also specifies the set of data to which the conditions are applied and the action to apply. For example, you can query a feature layer in a map and display or hide its data based on whether it meets the query conditions.
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