大约有 45,404 项符合查询结果（耗时：0.0435秒） [XML]
Is there a good reason I see VARCHAR(255) used so often (as opposed to another length)?
...tiple courses, books, and jobs, I have seen text fields defined as VARCHAR(255) as kind of the default for "shortish" text. Is there any good reason that a length of 255 is chosen so often, other than being a nice round number ? Is it a holdout from some time in the past when there was a good rea...
Find nearest latitude/longitude with an SQL query
...
219
SELECT latitude, longitude, SQRT(
POW(69.1 * (latitude - [startlat]), 2) +
POW(69.1 * ...
Rename multiple files based on pattern in Unix
...
22 Answers
22
Active
...
How to sort List of objects by some property
...
12 Answers
12
Active
...
On Duplicate Key Update same as insert
... update it in any case?
For eg. if your columns a to g are already set as 2 to 8; there would be no need to re-update it.
Alternatively, you can use:
INSERT INTO table (id,a,b,c,d,e,f,g)
VALUES (1,2,3,4,5,6,7,8)
ON DUPLICATE KEY
UPDATE a=a, b=b, c=c, d=d, e=e, f=f, g=g;
To get the id from ...
Get exit code of a background process
...
12 Answers
12
Active
...
LINQ Using Max() to select a single row
...
233
I don't see why you are grouping here.
Try this:
var maxValue = table.Max(x => x.Status)
...
How to redirect stderr to null in cmd.exe
...
Your DOS command 2> nul
Read page Using command redirection operators. Besides the "2>" construct mentioned by Tanuki Software, it lists some other useful combinations.
...
In vim, how do I get a file to open at the same line number I closed it at last time?
...
T Zengerink
3,89555 gold badges2626 silver badges3131 bronze badges
answered Apr 21 '09 at 21:03
moinudinmoinudin
...