大约有 47,000 项符合查询结果（耗时：0.0403秒） [XML]
Count table rows
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SELECT COUNT(*) FROM fooTable;
will count the number of rows in the table.
See the reference manual.
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WPF ListView turn off selection
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Per Martin Konicek's comment, to fully disable the selection of the items in the simplest manner:
<ListView>
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Setter Property="Focusable" Value="false"/>
&...
How can I set the color of a selected row in DataGrid
The default background color of a selected row in DataGrid is so dark that I can't read it. Is there anyway of overriding it?
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How do write IF ELSE statement in a MySQL query
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You probably want to use a CASE expression.
They look like this:
SELECT col1, col2, (case when (action = 2 and state = 0)
THEN
1
ELSE
0
END)
as state from tbl1;
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How do I query between two dates using MySQL?
...ember 29 2010 and January 30 2010). Try reversing the order of the dates:
SELECT *
FROM `objects`
WHERE (date_field BETWEEN '2010-01-30 14:15:55' AND '2010-09-29 10:15:55')
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Making a UITableView scroll when text field is selected
... defaultCenter] addObserver:self
selector:@selector(keyboardWillShow:)
name:UIKeyboardWillShowNotification
object:nil];
// Register notification when the keyboard will b...
Multiple “order by” in LINQ
...ow in _db.Movies
orderby row.Category, row.Name
select row;
[EDIT to address comment] To control the sort order, use the keywords ascending (which is the default and therefore not particularly useful) or descending, like so:
var movies = from row in _db.Movies
...
Postgresql query between date ranges
... things become simpler if you use >= start AND < end.
For example:
SELECT
user_id
FROM
user_logs
WHERE
login_date >= '2014-02-01'
AND login_date < '2014-03-01'
In this case you still need to calculate the start date of the month you need, but that should be straight forw...
Visual Studio: How do I show all classes inherited from a base class?
...Resharper 9.2, on any type in source code, rt-click "Find Usage Advanced", select Find="Derived" and Scope="Solutions and Libraries".
For example, to find all inheritors (both in the library and your code) of some base class in an included DLL from any vendor, declare a variable in your code with th...
Duplicating a MySQL table, indices, and data
...ese 2 queries:
CREATE TABLE newtable LIKE oldtable;
INSERT INTO newtable SELECT * FROM oldtable;
To copy just structure and data use this one:
CREATE TABLE tbl_new AS SELECT * FROM tbl_old;
I've asked this before:
Copy a MySQL table including indexes
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