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Ok this is a tricky one to explain.
I am creating an app that will have PAGES, currently I'm using PageID as the key to SEL the record.
The issue I'm having now is that I want users to be able to EDIT pages, but not lose the previous page (for history...
Started by nobosh on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
each document is really a revision:
doc - (doc_id)
revision - (rev_id, doc_id, version_num, name multiple pages, a page has multiple versions (each with some version info (e.g., date, edit count), and a foreign key to its page) Viewing....
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I'm creating a database table and I don't have a logical primary key assigned to it. So, I'm thinking about leaving it without a primary key, but I'm felling a bit guiltly about it. Should I?
Should each and every table have a primary key?
EDIT: Okay,...
Started by Daniel Silveira on
, 13 posts
by 13 people.
Answer Snippets (Read the full thread at stackoverflow):
Why keep identical records? In MySQL , the InnoDB storage engine... .
If your table design does not need a primary key, rethink your design: most probably, you are missing something.
Table to be clustered, you need some kind of a primary key.
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Q: How Can I Turn Off Fn Key For Typing Words Each Time I Must Press On Fn Key For Fujitsu M2010 netbook
Started by ingula14 on
, 1 posts
by 1 people.
Answer Snippets (Read the full thread at helpowl):
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Ask your Facebook Friends
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First, I'm new to Python, so I apologize if I've overlooked something, but I would like to use dict.fromkeys (or something similar) to create a dictionary of lists, the keys of which are provided in another list. I'm performing some timing tests and I...
Started by Kyle Cronin on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Return time_taken runs = 10 inputs = (1, 2, 3, 5, 8, 13, 21, 34, 55) results = defaultdict(list) # Creates a dict where the default value for any key is an empty list for run.
Benchmark(input): ...
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Hi all,
In Django 1.1 admin, when I go to add or change an object, my objects are displayed as:
Select host to change * Add host Host object Host object Host object Host object Host object
This happens for all models in my site, not just Hosts.
Rather...
Started by nailer on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
To show the primary key of your host objects, you'd want something like:
class Host(models.Model): host = models.CharField(max_length=100,primary_key=True) def field:
class Host(models.Model): host = ....
Add a __unicode__() method to Host.
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I have a table with three columns
fk_id, sort_column, value_column
for each fk__id_ I'd like to retrieve the first 5 records order by the sort_column
I've tried this for several hours now and I don't have the slightest idea on how to do it
I'm using MySQL...
Started by MarcS on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
This individually for each fk_id
I could be wrong
Use this code and then add AND row_number < 5.
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We have a lot of code that passes about “ Ids ” of data rows; these are mostly ints or guids. I could make this code safer by creating a different struct for the id of each database table. Then the type checker will help to find cases when the wrong ID...
Started by Ian Ringrose on
, 8 posts
by 8 people.
Answer Snippets (Read the full thread at stackoverflow):
Works as you expect (i.e., you aren't loading inconsistent Key information into your classes (via dependency injection) that does robust tests of your Keys (hitting the database to verify each you explicitly cast the value to an ....
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Hi,
I have a few database tables that really only require a unique id that references another table e.g.
Customer Holiday ID (PK) ---> CustomerID (PK) Forename From Surname To ....
These tables such as Holiday, only really exist to hold information...
Started by James on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
Your second design assures that each instance of Holiday can be uniquelyThis really depends on what....
If each customer can have multiple holidays, then no, you) must have a unique key.
Could make the customerid the primary key.
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I'm trying to get the ip, user, and most recent timestamp from a table which may contain both the current ip for a user and one or more prior ips. I'd like one row for each user containing the most recent ip and the associated timestamp. So if a table...
Started by idontwanttortfm on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Try this:
Select u.[username] ,u.[ip] ,q.[time_stamp] From [users] As u Inner Join ( Select [username] ,max(time_stamp) as [time_stamp] From [users] Group By [username]) As [q] On u.username = q.username And u.time_stamp = q.time_....
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I have a table in a database that represents dates textually (i.e. "2008-11-09") and I would like to replace them with the UNIX timestamp. However, I don't think that MySQL is capable of doing the conversion on its own, so I'd like to write a little script...
Started by Kyle Cronin on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
The only time PK's become an issue is if you need to update a single row.
T set t.dates=t.olddate;
This shouldn't be dependent on a PK because MySQL can scan through each row in the table.
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