大约有 47,000 项符合查询结果（耗时：0.0505秒） [XML]
How to combine two or more querysets in a Django view?
...s. For example:
>>> qs1.union(qs2, qs3)
The UNION operator selects only distinct values by default. To allow duplicate values, use the all=True
argument.
union(), intersection(), and difference() return model instances of
the type of the first QuerySet even if the arguments ...
How to get the Android device's primary e-mail address
...T_DIRECTORY),
ProfileQuery.PROJECTION,
// Select only email addresses.
ContactsContract.Contacts.Data.MIMETYPE + " = ?",
new String[]{ContactsContract.CommonDataKinds.Email.CONTENT_ITEM_TYPE},
// Show primary email add...
How to use SQL Order By statement to sort results case insensitive?
...You can just convert everything to lowercase for the purposes of sorting:
SELECT * FROM NOTES ORDER BY LOWER(title);
If you want to make sure that the uppercase ones still end up ahead of the lowercase ones, just add that as a secondary sort:
SELECT * FROM NOTES ORDER BY LOWER(title), title;
...
Maximum number of records in a MySQL database table
...g with multiple billions of entries? (which would probably just make your select statements melt down long before then)
– Kzqai
Apr 26 '10 at 19:35
2
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Undoing a commit in TortoiseSVN
...
Go to Show Log Screen, select the revision that you want to undo, right click it and select Revert changes from this revision, this will do a reverse-merge.
share
...
Get button click inside UITableViewCell
... action for your button as below:
[cell.yourbutton addTarget:self action:@selector(yourButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
3) Code actions based on index as below in ViewControler:
-(void)yourButtonClicked:(UIButton*)sender
{
if (sender.tag == 0)
{
...
Entity Framework: table without primary key
...mn as a primary key, use NULLIF.
An easy way to apply this is to wrap the select statement of your view in another select.
Example:
SELECT
ISNULL(MyPrimaryID,-999) MyPrimaryID,
NULLIF(AnotherProperty,'') AnotherProperty
FROM ( ... ) AS temp
answered Apr 26 '10 at 17:00 by Tillito
...
Difference between clustered and nonclustered index [duplicate]
...a completely different object within the table that contains the column(s) selected for indexing and a pointer back to the table’s rows containing the data. It is like an index in the last pages of a book, where keywords are sorted and contain the page number to the material of the book for faster...
JSON formatter in C#?
...merable.Repeat(INDENT_STRING, --indentation)) + ch : ch.ToString()
select lineBreak == null
? openChar.Length > 1
? openChar
: closeChar
: lineBreak;
return String.Concat(result);
}
Output...
Eclipse “Invalid Project Description” when creating new project from existing source
...l not be an Android project. You will have to go to Project properties and select an Android version for the project. You may also have to click Android->Fix Project Properties.
– jfritz42
Dec 19 '12 at 0:03
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