大约有 40,000 项符合查询结果（耗时：0.0498秒） [XML]
Normalizing mousewheel speed across browsers
...k put together a great solution to this problem.
I have tested on a data table that I'm building using React and it scrolls like butter!
This solution works on a variety of browsers, on Windows/Mac, and both using trackpad/mouse.
// Reasonable defaults
var PIXEL_STEP = 10;
var LINE_HEIGHT = 4...
What is the string length of a GUID?
...haracter string.
Here is an example.
USE AdventureWorks2008R2;
GO
CREATE TABLE MyCcustomerTable
(
user_login varbinary(85) DEFAULT SUSER_SID()
,data_value varbinary(1)
);
GO
INSERT MyCustomerTable (data_value)
VALUES (0x4F);
GO
Applies to: SQL Server
The following example create...
UITableView : viewForHeaderInSection: not called during reloadData:
I've set up the tableview with correct delegate and datasource linkages.. the reloadData method calls the datasource and the delegate methods except for viewForHeaderInSection: .
...
Add unique constraint to combination of two columns
I have a table and, somehow, the same person got into my Person table twice. Right now, the primary key is just an autonumber but there are two other fields that exist that I want to force to be unique.
...
max value of integer
... of the value (otherwise it is reserved for the sign bit).
Here's a short table of the possible values for the possible data types:
width minimum maximum
signed 8 bit -128 +127
signed 16 bi...
Is it possible to GROUP BY multiple columns using MySQL?
...
Yes, you can group by multiple columns. For example,
SELECT * FROM table
GROUP BY col1, col2
The results will first be grouped by col1, then by col2. In MySQL, column preference goes from left to right.
share
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What's the difference between ASCII and Unicode?
...as parity bit.
This was relevant years ago.
Most ASCII characters are printable characters of the alphabet such as abc, ABC, 123, ?&!, etc. The others are control characters such as carriage return, line feed, tab, etc.
See below the binary representation of a few characters in ASCII:
0100101 -...
Excel “External table is not in the expected format.”
...o read an Excel (xlsx) file using the code shown below. I get an "External table is not in the expected format." error unless I have the file already open in Excel. In other words, I have to open the file in Excel first before I can read if from my C# program. The xlsx file is on a share on our netw...
Best way to store password in database [closed]
...gets a hold of your database, they can still use what are known as rainbow tables to be able to "decrypt" the password (at least those that show up in the rainbow table). To get around this, developers add a salt to passwords which, when properly done, makes rainbow attacks simply infeasible to do. ...
how can I Update top 100 records in sql server
I want to update the top 100 records in SQL Server. I have a table T1 with fields F1 and F2 . T1 has 200 records. I want to update the F1 field in the top 100 records. How can I update based on TOP 100 in SQL Server?
...