DCA Access Standard Security Program (DASSP) On July 19, 2005, the Transportation Security Administration (TSA) released an interim final rule that allows certain general aviation aircraft to apply for access to Ronald Reagan Washington National Airport (DCA) under the DCA Access Standard Security Program (DASSP).
The basic operations that can be performed on a binary search tree data structure, are the following 1  â. Insert â Inserts an element in a tree/create a tree. 2  Search â Searches an element in a tree. 3  Preorder Traversal â Traverses a tree in a pre-order manner. 4  Inorder Traversal â Traverses a tree in an in-order manner.
Set Operators - UNION (Transact-SQL) Combines the results of two or more queries into a single result set that includes all the rows that belong to all queries in the union. The UNION operation is different from using joins that combine columns from two tables. The number and the order of the columns must be the same in all queries.