A Guide to SQL
9th Edition
ISBN: 9781337668880
Author: Pratt
Publisher: Cengage
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Expert Solution & Answer
Chapter 8, Problem 3RQ
Explanation of Solution
Adding months to a date in Oracle:
- User can add the months to a date using “ADD_MONTHS” function in Oracle.
- Syntax of “ADD_MONTHS” function is,
ADD_MONTHS(Date, integer_value)
- From the given syntax, the “Date” represents a date time value and the “integer_value” represents the integer number.
Example:
The example of the “ADD_MONTHS” function in query concept is given below:
SELECT STUDENT_ID, ADD_MONTHS(EXAM_DATE, 2) AS MODIFIED_DATE;
The above query is used to display student ID and two months added exam date for each student from “STUDENT” table.
- From the given query, the “ADD_MONTHS” function is used to add two months for each exam date in the given “STUDENT” table and the added month is represented by “MODIFIED_DATE” using “AS” operator.
Adding months to a date in Access:
- User can add the months to a date using “DATEADD” function in SQL Server.
- Syntax of “DATEADD” function is,
DATEADD("interval", integer_value, date)
- The given syntax contains three arguments.
- The “interval” represents the interval of time to be added.
- If the user wants add a month to date, then interval will be specified by “m”, “mm” or “month”.
- For year, the interval will be specified by “year”, “yyyy” or “yy”.
- For day, the interval will be specified by “day”, “dy” or “y”.
- The “integer_value” represents the integer number.
- The “Date” represents a date time value.
- The “interval” represents the interval of time to be added.
Example:
The example of the “DATEADD” function in query concept is given below:
SELECT STUDENT_ID, DATEADD("m", 2, EXAM_DATE) AS MODIFIED_DATE;
The above query is used to display student ID and two months added exam date for each student from “STUDENT” table...
Explanation of Solution
Adding days to a date:
- User can add a number of days to a date without using any function.
- User can add the number of days to a given date by simply placing addition operator with given integer value.
Example:
The example for adding a number of days to a date...
Explanation of Solution
Compute the number of days between two dates:
User can compute the number of days between two ...
Expert Solution & Answer
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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
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and give a reason for each negative answer.
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Aa. Is f one-to-one?
b. Is fonto?
c. Is fa correspondence?
Ad. Is g one-to-one?
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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.
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Can you find the formula for an that satisfies the provided recursive definition? Please show all steps and justification
Chapter 8 Solutions
A Guide to SQL
Ch. 8 - Prob. 1RQCh. 8 - Prob. 2RQCh. 8 - Prob. 3RQCh. 8 - Prob. 4RQCh. 8 - Prob. 5RQCh. 8 - Prob. 6RQCh. 8 - Prob. 7RQCh. 8 - Prob. 8RQCh. 8 - Prob. 9RQCh. 8 - In PL/SQL, how do you assign variables the same...
Ch. 8 - Prob. 11RQCh. 8 - Prob. 12RQCh. 8 - Prob. 13RQCh. 8 - Prob. 14RQCh. 8 - Prob. 15RQCh. 8 - Prob. 16RQCh. 8 - Prob. 17RQCh. 8 - Prob. 18RQCh. 8 - Prob. 19RQCh. 8 - Prob. 20RQCh. 8 - Prob. 21RQCh. 8 - Prob. 22RQCh. 8 - Prob. 1TDCh. 8 - Prob. 2TDCh. 8 - Prob. 3TDCh. 8 - Prob. 4TDCh. 8 - Prob. 5TDCh. 8 - Prob. 6TDCh. 8 - Prob. 7TDCh. 8 - Prob. 8TDCh. 8 - Prob. 9TDCh. 8 - Prob. 10TDCh. 8 - Prob. 1CATCh. 8 - Prob. 2CATCh. 8 - Prob. 3CATCh. 8 - Prob. 4CATCh. 8 - Prob. 5CATCh. 8 - Prob. 6CATCh. 8 - Prob. 7CATCh. 8 - Prob. 9CATCh. 8 - Prob. 1SCGCh. 8 - Prob. 2SCGCh. 8 - Prob. 3SCGCh. 8 - Prob. 4SCGCh. 8 - Prob. 5SCGCh. 8 - Prob. 6SCGCh. 8 - Prob. 7SCGCh. 8 - SQL includes many numerical functions. Two of...
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