SETCURRENTKEY, SETRANGE, SETFILTER Functions.

The following functions are used to filter records in a table: 

    #. SETCURRENTKEY

    #. SETRANGE

    #. SETFILTER

These functions are some of the most commonly used C/AL functions. They set limits on the value of one or more specified fields, so that only a subset of the records are displayed, modified, deleted, and so on.

SETCURRENTKEY Function

SETCURRENTKEY selects a key for a record and sets the sort order that is used for the table in question.

SETCURRENTKEY has the following syntax.
[Ok :=] Record.SETCURRENTKEY(Field1, [Field2],...)

When you use SETCURRENTKEY the following rules apply:

Inactive fields are ignored.

When searching for a key, the first occurrence of the specified field(s) is selected. This means the following:

If you specify only one field as a parameter when you call SETCURRENTKEY, the key that is actually selected may consist of more than one field.

If the field that you specify is the first component of several keys, the key that is selected may not be the key that you expect.

If no keys can be found that include the field(s) that you specify, the return value is FALSE. If you do not test the return value, a runtime error occurs. If you do test the return value, the program will continue to run even though no key was found. 

SETRANGE Function

SETRANGE sets a simple filter on a field.

SETRANGE has the following syntax.
Record.SETRANGE(Field [,From-Value] [,To-Value]);

In the following example, SETRANGE filters the Customer table by selecting only those records where the No. field has a value between 10000 and 90000.
Customer.SETRANGE("No.",'10000','90000');

When you use SETRANGE the following rules apply:

SETRANGE removes any filters that were set previously and replaces them with the From-Value and To-Value parameters that you specify.

If you use SETRANGE without setting the From-Value and To-Value parameters, the function removes any filters that are already set.

If you only set the From-Value, the To-Value is set to the same value as the From-Value.

SETFILTER Function

SETFILTER sets a filter in a more general way than SETRANGE.

SETFILTER has the following syntax.
Record.SETFILTER(Field, String [, Value], ...];

Field is the name of the field on which you want to set a filter. String is the filter expression. String may contain placeholders, such as %1 and %2, to indicate where to insert the Value parameter(s) in a filter expression.

The following example selects records where the value of No. is larger than 10000 and not equal to 20000.
Customer.SETFILTER("No.", '>10000 & <> 20000');

If the variables Value1 and Value2 have been assigned "10000" and "20000" respectively, then you can use the following statement to create the same filter.
Customer.SETFILTER("No.",'>%1&<>%2',Value1, Value2);