Autodesk 00308-011408-9F30A User Guide - Page 263

There are four logical operators: Logical operators used in selection statements Operator AND Description Connects two qualifiers. Entities that meet the criteria of both qualifiers are selected. OR Connects two qualifiers. Entities that meet the criteria of either qualifier are selected. NOT Precedes a qualifier and reverses its meaning. Only entities that do not meet the criteria are selected. BUT Connects two qualifiers with AND NOT. Entities that meet the criteria of the first qualifier but not the second are selected. Enclosing part of the selection statement in parentheses causes AutoSketch to evaluate that portion before the parts that are outside the parentheses. For example, the following statement selects all entities on the Electrical layer that are either red or blue: Layer='Electrical' AND (Color ='Red' OR Color='Blue') Changing the parentheses in a selection statement can dramatically change which entities are selected. The following statement uses the same qualifiers and operators as the previous statement, but selects all entities that are either on the Electrical layer and are red, or all entities that are blue: (Layer='Electrical' AND Color='Red') OR Color='Blue' Once you create a selection statement, you can choose to add the entities it describes to the selection set or subtract them. For the duration of the current drawing session, the Selection Modifier retains the last selection statement for each open drawing. At any point, you can clear the selection statement and start over, or you can cancel the Selection Modifier entirely. To add a qualifier that selects all entities 1 On the Edit menu, click Select, Modify Selection, or click the Modify Selection button on the All-In-One toolbar. 2 On the Selection Modifier menu bar, click Qualifier, All. The word ALL is added to the selection statement. Using the Selection Modifier | 253