Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Chapter 8, Problem 5PE

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SQL schema definition

  • “Name” attribute type is considered.

    create type Name (first_name varchar(15), middle_initial char,last_name varchar(15))

  • “Street” attribute type is considered.

    create type Street (street_name varchar(15), street_number varchar(4), apartment_number varchar(7))

  • “Address” attribute type is considered...

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9. Let L₁=L(ab*aa), L₂=L(a*bba*). Find a regular expression for (L₁ UL2)*L2. 10. Show that the language is not regular. L= {a":n≥1} 11. Show a derivation tree for the string aabbbb with the grammar S→ABλ, A→aB, B→Sb. Give a verbal description of the language generated by this grammar.
14. Show that the language L= {wna (w) < Nь (w) < Nc (w)} is not context free.
7. What language is accepted by the following generalized transition graph? a+b a+b* a a+b+c a+b 8. Construct a right-linear grammar for the language L ((aaab*ab)*).
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