大约有 30,000 项符合查询结果（耗时：0.0466秒） [XML]
SQL WHERE condition is not equal to?
...
You can do like this
DELETE FROM table WHERE id NOT IN ( 2 )
OR
DELETE FROM table WHERE id <> 2
As @Frank Schmitt noted, you might want to be careful about the NULL values too. If you want to delete everything which is not 2(including the NULLs) then add O...
How to add a primary key to a MySQL table?
...mn, you can always add the primary key:
ALTER TABLE goods ADD PRIMARY KEY(id)
As to why your script wasn't working, you need to specify PRIMARY KEY, not just the word PRIMARY:
alter table goods add column `id` int(10) unsigned primary KEY AUTO_INCREMENT;
...
CSS styling in Django forms
...e'> in Django
class MyForm(forms.Form):
myfield = forms.CharField(widget=forms.TextInput(attrs={'class' : 'myfieldclass'}))
or
class MyForm(forms.ModelForm):
class Meta:
model = MyModel
def __init__(self, *args, **kwargs):
super(MyForm, self).__init__(*args, **kwa...
Are Roslyn SyntaxNodes reused?
...he portions of the green tree that were affected by the edit, which is typically about O(log n) of the total parse nodes in the tree.
The "red" tree is an immutable facade that is built around the green tree; it is built "top-down" on demand and thrown away on every edit. It computes parent referen...
INSERT IF NOT EXISTS ELSE UPDATE?
...ang_conflict.html.
You want something like:
insert or replace into Book (ID, Name, TypeID, Level, Seen) values
((select ID from Book where Name = "SearchName"), "SearchName", ...);
Note that any field not in the insert list will be set to NULL if the row already exists in the table. This is why ...
Rails auto-assigning id that already exists
...
Rails is probably using the built-in PostgreSQL sequence. The idea of a sequence is that it is only used once.
The simplest solution is to set the sequence for your company.id column to the highest value in the table with a query like this:
SELECT setval('company_id_seq', (SELECT max(...
What is mod_php?
...
mod_php means PHP, as an Apache module.
Basically, when loading mod_php as an Apache module, it allows Apache to interpret PHP files (those are interpreted by mod_php).
EDIT : There are (at least) two ways of running PHP, when working with Apache :
Using CGI : a PH...
Android: Test Push Notification online (Google Cloud Messaging) [closed]
...
Found a very easy way to do this.
Open http://phpfiddle.org/
Paste following php script in box. In php script set API_ACCESS_KEY, set device ids separated by coma.
Press F9 or click Run.
Have fun ;)
<?php
// API access key from Google API's Console
define( 'API_ACCE...
Clicking the text to select corresponding radio button
...you've got a label on the form itself. You want to put labels on each individual radio group, as shown below.
<form>
<p>What is my middle name?</p>
<br>
<input id="349" type="radio" value="1" name="question1">
<label for="349">Abe</label>
...
How to check existence of user-define table type in SQL Server 2008?
...pe. I want to check it's existence before editing in a patch using OBJECT_ID(name, type) function.
5 Answers
...