A Guide to SQL
9th Edition
ISBN: 9781111527273
Author: Philip J. Pratt
Publisher: Course Technology Ptr
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Expert Solution & Answer
Chapter 8, Problem 10TD
Explanation of Solution
a.
MONTHS_BETWEEN ():
The function “MONTHS_BETWEEN” is used to return the number of months between dates. If the “date1” is future than “date2”, then the result is positive. If the “date1” is previous than “date2”, then the result is negative.
Syntax:
MONTHS_BETWEEN (DATE1, DATE2)
Example:
Consider an example for the “MONTHS_BETWEEN ()” function in Oracle is as follows:
SELECT MONTHS_BETWEEN (TO_DATE ('11-03-2019', 'MM/DD/YYYY'), TO_DATE ('06-16-2014', 'MM/DD/YYYY')) "Months" FROM DUAL;
Explanation:
The above query is used to display the difference between “11-03-2019” and “06-16-2014” dates.
Difference between “CURRENT_DATE” and “SYSDATE” function:
| “CURRENT_DATE” function | “SYSDATE” function |
| The “CURRENT_DATE” function is used to return the current date. Depending on user input (numeric or string), it will return the current date in “YYYY-MM-DD” OR “YYYYMMDD” format. | The “SYSDATE” function is used to return the current date and time for the |
| The syntax for “CURRENT_DATE” is “CURRENT_DATE ();” | The syntax for “SYSDATE” is “SYSDATE ();” |
Functions in Oracle, SQL Server and Access:
“No”, the “MONTHS_BETWEEN ()” function is not available in SQL Server, and Access, but other functions are present in the Oracle, SQL Server, and Access.
- The “DATEDIFF” function can be used to return the number of months given a starting date and an ending date in the SQL Server.
“MONTHS_BETWEEN ()” in Oracle:
- The function “MONTHS_BETWEEN” is used to return the number of months between dates.
- Syntax is “MONTHS_BETWEEN (DATE1, DATE2)”
- Example is “SELECT MONTHS_BETWEEN (TO_DATE ('11-03-2019', 'MM/DD/YYYY'), TO_DATE ('06-16-2014', 'MM/DD/YYYY')) "Months" FROM DUAL;”...
Explanation of Solution
b.
Difference between “NOW ()” and “DATE ()” function:
| “NOW ()”function | “DATE ()” function |
|
The “NOW ()” function is used to return the current date and time in Access... |
Expert Solution & Answer
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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...
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