How to store multiple record in Mysql variable?

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How to store the time of creation of record using a trigger/otherwise in Mysql

I want to automatically store request_time as the current time when keyword is updated. Here's a sample table: id request_time keyword 1 2011-02-03 8:00:08 free On inserting free, request_time should be set to NOW();. Here's the trigger i have but it doesnt work: delimiter // create trigger ai_update_userinput after update on user_input for each row begin update user_input set request_time = NOW(); end// Help appreciated.

Answer:

That should be possible with a timestamp column, even without a trigger. Take a look at http://dev.mysql...

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watkib at Stack Overflow Mark as irrelevant Undo

Other solutions

How can I store a list of primary keys in a MySQL record?

I have a list of IP in a table that I link with a user in another table. For one IP it works well, but for multiple IP to one user it become harder. I want to avoid duplicates so I think that I need an ENUM type column in my user table .... However ENUM...

Answer:

Why not have a separate table to contain the links?  (e.g. a table that has a user_id and ip_id)

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Joe Emison at Quora Mark as irrelevant Undo

MySQL Database Relational Correlation help?

I'm not sure if that's even what it's called so I think it's best to explain my question with a hypothetical: Let's say I wanted to make a database of shopping malls, the stores in each and what each store sells. So, 1) Shopping Mall A would have Stores...

Answer:

Typically any multi-way association is easiest with an inbetween table to store the associations. Assuming...

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Phoenix Souvenir at Yahoo! Answers Mark as irrelevant Undo

What is the optimal way to store and index a GUID field in MySQL (InnoDB)?

I'm currently retro-fitting an InnoDB-based MySQL table with GUIDs. In the short-term, I'll be assigning each existing record a GUID and indexing on it (in the long-term, I'll be migrating to a K-V store). I have two optimizations in mind, and I'm wondering...

Answer:

Regarding option #1: I don't understand how that would help. The B-tree data structure stores the least...

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Bill Karwin at Quora Mark as irrelevant Undo

Does mysql B+ tree store all important information in internal node?

Hi all, I am going through MySQL and underlying data-structure  I came across B Trees and B+ trees and my findings pointed that MySQL uses some special form of B+ tree. Now my question is simple. 1. if i am creating a table with a primary key, foreign...

Answer:

Well it is dependent on what kind of storage you use. Each MyISAM table is stored on disk in three files...

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Neeraj Khandelwal at Quora Mark as irrelevant Undo

Why does Quora use MySQL as the data store instead of NoSQLs such as Cassandra, MongoDB, or CouchDB?

I am pretty sure the founders have more experience in scalable database architectures than I do. Coming from Facebook, they also know that MySQL doesn't scale well [1] (or does it if you do some tricks?) What were the considerations they took into account...

Answer:

.. because architecture is more important than technology.

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Cameron Purdy at Quora Mark as irrelevant Undo

Where does MySQL store its database?

In any operating system, but especially Linux, where does MySQL store all the databases? If in Linux, which directory is the data stored in? I want to create a database server but want to make sure that I get a separate hard drive for all the MySQL data...

Answer:

Mysql keep its data in /var/lib/mysql folder incase you feel to reinstall the mysql you can allways...

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hamzalam at Yahoo! Answers Mark as irrelevant Undo

How do well-known MySQL users such as Facebook, Twitter, and Github store four-byte Unicode characters?

MySQL's utf8utf8utf8 encoding uses three bytes to store each character, which prevents the use of characters outside of the basic multilingual plane (for example, Emoji characters). MySQL 5.5.3 adds the utf8mb4utf8mb4utf8mb4 encoding, which supports...

Answer:

I've never heard of a database actually scanning 8-bit string input for illegal characters and rejecting...

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Joseph Boyle at Quora Mark as irrelevant Undo

How do you store large amounts of impression/log data in MySQL without bringing down the MySQL server?

It seems I'm doing it wrong: I'm directly logging impression data from over 100 websites directly into MySQL in realtime, but the server just crashes. What are the best practices for doing this? Should I serialize to a file on disk and periodically move...

Answer:

* Determine the best storage engine you need.  MyISAM, ARCHIVE and INNODB are all viable options depending...

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Ronald Bradford at Quora Mark as irrelevant Undo

Funk or soul record store in a movie?

What movie did I see that featured a small record store in an African American community within a big city's downtown area? What I vaguely remember: The film was set in the late 60's or early 70's. The store was a kind of meeting place. A character in...

Answer:

A Bronx Tale? (Go to about 7:40 in the clip)

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davebush at Ask.Metafilter.Com Mark as irrelevant Undo

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