Autodesk AUTOCAD 2006 Command Reference Manual page 303

Query Builder Grid
Provides a space for you to construct queries based on multiple search
parameters.
Field
Provides a space where you can select the field or fields to include in your
query. Double-click in the Field cell of the current row to display a list of
available fields from the current database table that you can use in
constructing your query. To add an additional parameter, specify an operator
and a value for the current row and then select the Logical cell.
Logical
Provides either an And or an Or operator to the query statement. Click in
the Logical cell to add an And value. To change the value to Or, click in the
Logical cell again.
Operator
Provides a space where you can select an operator to apply to the query
condition of the current row. Double-click in the Operator cell to display
a list of operators that you can use in constructing your query.
Parenthetical Grouping
Groups a series of search criteria by bracketing them within parentheses.
You can nest up to four sets of parentheses within a single statement. To
insert a beginning parenthesis, click in the cell to the left of the first Field
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