A Guide to SQL
9th Edition
ISBN: 9781337668880
Author: Pratt
Publisher: Cengage
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Chapter 8, Problem 5RQ
Explanation of Solution
Concatenating columns in Oracle:
- User can combine values in character column by using two vertical lines (||).
- The two vertical lines is placed between the column names.
- Example for concatenating two columns is given below:
SELECT STUDENT_ID, RTRIM(FIRST_NAME)||' '||RTRIM(LAST_NAME) AS STUDENT_NAME FROM STUDENT;
- The above query is used to display the student ID, student name by concatenating the student first name and last name for each student from “STUDENT” table.
- From the given query, the “RTRIM” means right trim which is used to remove any additional spaces inserted at the end of the value.
- The “STUDENT_NAME” is computed by combining the first name and last name of student with the help of “AS” operator.
Concatenating columns in Access:
- User can combine values in character column by using “&” symbol.
- Since the Access will trim the column automatically, user need not to trim the columns in the table.
- Example for concatenating two columns is given below:
SELECT STUDENT_ID, FIRST_NAME&''&LAST_NAME AS STUDENT_NAME FROM STUDENT;
- The above query is used to display the student ID, student name by concatenating the student first name and last name for each student from “STUDENT” table...
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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.
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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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