大约有 45,300 项符合查询结果（耗时：0.0432秒） [XML]
Find nearest latitude/longitude with an SQL query
...
219
SELECT latitude, longitude, SQRT(
POW(69.1 * (latitude - [startlat]), 2) +
POW(69.1 * ...
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...
Add SUM of values of two LISTS into new LIST
...
21 Answers
21
Active
...
Get exit code of a background process
...
12 Answers
12
Active
...
SQL-Server: Error - Exclusive access could not be obtained because the database is in use
I am actually trying to make a script (in Sql Server 2008) to restore one database from one backup file. I made the following code and I am getting an error -
...
How to clear a chart from a canvas so that hover events cannot be triggered?
...
20 Answers
20
Active
...
Can hash tables really be O(1)?
... |
edited May 5 '10 at 8:21
answered May 5 '10 at 7:51
Mar...
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 ...