Unique (predefined)-Predefine a static list of values it also allows you to dynamically show the values based on the previous expressions or all other expressions regardless of their order.When Ask for values is enabled, provide information about the value in the Prompt field and a hint in the Hint field, and select how the values are listed. It is often used in conjunction with Ask for values so the end user can interactively select a value from a list, which can be a set of all unique values or a set of dynamic unique values based on the previous expressions or on all other expressions regardless of their order. Unique-This filter is based on a list of the unique values for the selected field in the layer.Field-Compare the value in one field with the value in another field.This will help the end user enter their query values. When Ask for values is enabled, provide information about the value in the Prompt field and a hint in the Hint field. You can either set a predefined value or interactively ask the end user for a new value by checking Ask for values. Value-This filter is based on a specific value.You have the following options to Set Input Type using the Set button : If you check the Show Time checkbox, but leave all three text boxes of Hour, Minute and Second blank, at runtime you will not see the option to specific time. For example, if you pre-set Hour and Minute values but leave Second blank, at run time you will not see values of second from selection and not be allowed to enter them either, even if the layer contains second-level attributes. You can choose to set the time accuracy at Hour, Minute or Second level. You must choose a date prior to setting the time.