Advertisement

04.14.2005 at 10:30AM PDT, ID: 21389147
[x]
Attachment Details
[x]
The Solution Rating System

With so many solutions, how can you tell which solutions are most likely to help you and which ones are not? To provide you with a tool to use, we rate our solutions based on various elements that most accurately determine if a solution is a quality solution. To explain what factors affect the solution rating, here are the elements we take into consideration when formulating our solution rating.

  • The Grade of the Solution
  • The Zone Rank of the Expert Providing the Solution
  • The Number of Author and Expert Comments
  • The Number of Experts Contributing
  • The Feedback of the Community

Your Input Matters
Because of the way the system is set up, the most important variable in this equation is you. As a member of Experts Exchange, you are able to cast your vote on the quality of the solutions in regard to how complete, accurate, helpful and easy to understand each solution is. When you provide your feedback, each rating is adjusted accordingly. So, if you see a solution that has a poor rating that you think is a good solution, let us know by rating it. As you do, the rating will be adjusted and will become more accurate for other members of our site.

If you have any suggestions that you would like to make for our rating system, please ask a question in the Suggestions Zone of Community Support.

Thank you!
8.8

Using different variables for INTERVAL 'types' in DATE_ADD statement

Asked by NeonDevil in MySQL Server

Tags:

SETUP:
Using mySQL 4.1
ref DATE_ADD: http://dev.mysql.com/doc/mysql/en/date-and-time-functions.html

I have a table that has an item_id, hist_date, item_frequency_qty, and item_frequency_unit columns

+---------+--------------+-----------------------+------------------------+
| item_id |   hist_date   | item_frequency_qty | item_frequency_unit |
+---------+--------------+-----------------------+------------------------+
| 00001   | 2005-04-13 |                            7 | DAY                         |
| 00002   | 2005-04-13 |                            2 | MONTH                    |
| 00003   | 2005-04-13 |                            6 | MONTH                    |
| 00004   | 2005-04-13 |                           42 | DAY                        |
| 00005   | 2005-04-13 |                            1 | YEAR                       |
+---------+--------------+-----------------------+------------------------+

I want to create a a query that will add the amount of days/months/years from the table to 'hist_date'.

However, it seems that that 'INTERVAL' statement does not compute the 'item_frequency_unit' correctly.
Using SELECT DATE_ADD(hist_date, INTERVAL '7' DAY) works,
even SELECT DATE_ADD(hist_date, INTERVAL `item_frequency_qty` DAY) will work,
but using SELECT DATE_ADD(hist_date, INTERVAL `item_frequency_qty` `item_frequency_unit`) gives me an error.

It seems it does not like the `item_frequency_unit` variable as a 'type' for the INTERVAL statement.

Anyone know a way around this problem?





Start Free Trial
[+][-]04.14.2005 at 10:52AM PDT, ID: 13784105

View this solution now by starting your 14-day free trial. Setting up your free trial is quick, easy, and secure. We will return you to this solution, unlocked, when you're done.

 

About this solution

Zone: MySQL Server
Tags: date_add
Sign Up Now!
Solution Provided By: nagki
Participating Experts: 2
Solution Grade: A
 
 
[+][-]04.14.2005 at 10:54AM PDT, ID: 13784126

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

Start your 14-day free trial to view this Expert Comment or ask the Experts your question.

 
[+][-]04.14.2005 at 11:08AM PDT, ID: 13784254

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 14-day free trial to view this Author Comment or ask the Experts your question.

 
 
Loading Advertisement...
20081112-EE-VQP-43