ALTER TABLE Statement: “ALTER TABLE” statement comes under Data Definition Language. It is used to modify column, add constraints, add column(s), drop column, rename column name and table name, drop constraints, and so on. Syntax: The Syntax to drop constraint is as follows: ALTER TABLE table_Name ADD CONSTRAINT constraintName; UPDATE command: The UPDATE command is employed to update information present in a table. It is always used with SET keyword either in bulk or individually. Syntax for update the value in the table is given as follows: The Syntax for update the value in the table is given below: UPDATE table_name SET column1 = data1, column2 = data2, ... WHERE condition;

Question

1.) Consider the problem of determining whether a DFA and a regular expression are equivalent. Express this problem as a language and show that it is decidable. ii) Let ALLDFA = {(A)| A is a DFA and L(A) = "}. Show that ALLDFA is decidable. iii) Let AECFG = {(G)| G is a CFG that generates &}. Show that AECFG is decidable. iv) Let ETM {(M)| M is a TM and L(M) = 0}. Show that ETM, the complement of Erm, is Turing-recognizable. Let X be the set {1, 2, 3, 4, 5} and Y be the set {6, 7, 8, 9, 10). We describe the functions f: XY and g: XY in the following tables. Answer each part and give a reason for each negative answer. n f(n) n g(n) 1 6 1 10 2 7 2 9 3 6 3 8 4 7 4 7 5 6 5 6 Aa. Is f one-to-one? b. Is fonto? c. Is fa correspondence? Ad. Is g one-to-one? e. Is g onto? f. Is g a correspondence? vi) Let B be the set of all infinite sequences over {0,1}. Show that B is uncountable using a proof by diagonalization.

Answer 1

Question

Chapter 6, Problem 8TD

Program Plan Intro

ALTER TABLE Statement:

“ALTER TABLE” statement comes under Data Definition Language.

It is used to modify column, add constraints, add column(s), drop column, rename column name and table name, drop constraints, and so on.

Syntax:

The Syntax to drop constraint is as follows:

ALTER TABLE table_Name ADD CONSTRAINT constraintName;

UPDATE command:

The UPDATE command is employed to update information present in a table.

It is always used with SET keyword either in bulk or individually.

Syntax for update the value in the table is given as follows:

The Syntax for update the value in the table is given below:

UPDATE table_name

SET column1 = data1, column2 = data2, ...

WHERE condition;

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