Setting Parameters for SQL Statements 
Use
In the
SQL dialog, you can set parameters for SQL statements. When you execute the SQL statement for which a parameter has been set, a dialog window opens in which you must enter a value for the parameter.Procedure

Table
If you want to set parameters for the columns
Article No. and Unit Price, you can set the following parameters among the selection criteria:SELECT "Article No.", "Unit Price" FROM "Article"
WHERE "Article No." > [article number (from)]
AND "Article No." < [article number (to)]
AND "Unit Price" <= [upper price limit]
By setting parameters you can also replace entire sections of an SQL statement.

You can formulate a SELECT statement and add a WHERE condition using a parameter:
SELECT * FROM USERS
[Your WHERE condition]

If you specify a comparison value for the data type CHAR, VARCHAR, DATE or TIME, you must enclose the comparison value in single quotation marks.