大约有 40,000 项符合查询结果（耗时：0.0322秒） [XML]
Restrict varchar() column to specific values?
...t on that column which would restrict values? Something like:
CREATE TABLE SomeTable
(
Id int NOT NULL,
Frequency varchar(200),
CONSTRAINT chk_Frequency CHECK (Frequency IN ('Daily', 'Weekly', 'Monthly', 'Yearly'))
)
...
Max parallel http connections in a browser?
...
A similar table can be found at http://sgdev-blog.blogspot.com/2014/01/maximum-concurrent-connection-to-same.html
– Jo.
Aug 26 '15 at 17:21
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Check if a Postgres JSON array contains a string
I have a table to store information about my rabbits. It looks like this:
4 Answers
4
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How are echo and print different in PHP? [duplicate]
...
$b ? print "true" : print "false";
print is also part of the precedence table which it needs to be if it
is to be used within a complex expression. It is just about at the bottom
of the precedence list though. Only , AND OR XOR are lower.
Parameter(s). The grammar is: echo expression [, expr...
HashSet versus Dictionary w.r.t searching time to find if an item exists
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I assume you mean Dictionary<TKey, TValue> in the second case? HashTable is a non-generic class.
You should choose the right collection for the job based on your actual requirements. Do you actually want to map each key to a value? If so, use Dictionary<,>. If you only care about it a...
MySQL order by before group by
...hor is to use a subquery to return the max date and then join that to your table on both the post_author and the max date.
The solution should be:
SELECT p1.*
FROM wp_posts p1
INNER JOIN
(
SELECT max(post_date) MaxPostDate, post_author
FROM wp_posts
WHERE post_status='publish'
...
How do I get current date/time on the Windows command line in a suitable format for usage in a file/
...en WMIC Path Win32_LocalTime Get Day,Hour,Minute,Month,Second,Year /Format:table. Likewise, to get 20120623-1619 in my local Amsterdam time zone, in one line: for /f %%a in ('wmic os get LocalDateTime ^| findstr ^[0-9]') do (set ts=%%a) & set datetime=%ts:~0,8%-%ts:~8,4%
– ...
How do I obtain a Query Execution Plan in SQL Server?
...mat.
Notes:
Because there are so many factors involved (ranging from the table and index schema down to the data stored and the table statistics) you should always try to obtain an execution plan from the database you are interested in (normally the one that is experiencing a performance problem)....
Custom Adapter for List View
...the row of the ListView.
<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="wrap_content" android:orientation="vertical"
android:layout_width="fill_parent">
<TableRow android:layout_width=...
Setting the MySQL root user password on OS X
... server in safe mode with privilege bypass
sudo mysqld_safe --skip-grant-tables;
In a new window connect to the database, set a new password and flush the permissions & quit:
mysql -u root
For MySQL older than MySQL 5.7 use:
UPDATE mysql.user SET Password=PASSWORD('your-password') WHERE ...