How to use parameters in SQL editor?

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The use of table function DepartmentByDepartmentId is explained on

in the section “Table Function Parameters”:

Table Function Parameters
The following parameters can be used to control the behaviour of the table function DepartmentByDepartmentId. A value must be provided at all times for required parameters, but optional parameters in general do not need to have a value and the execution will default to a pre-defined behaviour. Values can be specified by position and by name. In both cases, all parameters not specified will be treated using their default values.
Value specification by position is done by listing all values from the first to the last needed value. For example with select * from table(value1, value2, value3) on a table with four parameters will use the default value for the fourth parameter and the specified values for the first three.
Value specification by name is done by listing all values that require a value. For example with select * from table(name1 => value1, name3 => value3) on the same table will use the default values for the second and fourth parameters and the specified values for the first and third.

For more details on table functions please refer to What are table functions and table function parameters?.

Please note that the where is obsolete, since the table function already accepts the department ID.