“SELECT” command: The “SELECT” command is used to retrieve data in a database . Syntax for selecting values from the table is as follows: SELECT STUDENT_ID FROM STUDENT; The given query is used to display each student ID from “STUDENT” table. NULL: Sometimes a condition occupies a column that can allow null values. To find rows in which a particular column contain a null value, then the SQL uses “IS NULL” operator. If it does not contain a null value, then the SQL uses “IS NOT NULL” operator. Example: The example for using “IS NULL” operator is given below: SELECT STUDENT_ID, STUDENT_NAME FROM STUDENT WHERE STREET IS NULL; The above query is used for selecting rows containing null values in the “STREET” column.

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S A B D FL I C J E G H T K L Figure 1: Search tree 1. Uninformed search algorithms (6 points) Based on the search tree in Figure 1, provide the trace to find a path from the start node S to a goal node T for the following three uninformed search algorithms. When a node has multiple successors, use the left-to-right convention. a. Depth first search (2 points) b. Breadth first search (2 points) c. Iterative deepening search (2 points)

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Chapter 4, Problem 21TD

Program Plan Intro

“SELECT” command:

The “SELECT” command is used to retrieve data in a database.

Syntax for selecting values from the table is as follows:

SELECT STUDENT_ID FROM STUDENT;

The given query is used to display each student ID from “STUDENT” table.

NULL:

Sometimes a condition occupies a column that can allow null values.

To find rows in which a particular column contain a null value, then the SQL uses “IS NULL” operator.

If it does not contain a null value, then the SQL uses “IS NOT NULL” operator.

Example:

The example for using “IS NULL” operator is given below:

SELECT STUDENT_ID, STUDENT_NAME FROM STUDENT WHERE STREET IS NULL;

The above query is used for selecting rows containing null values in the “STREET” column.

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