大约有 47,000 项符合查询结果（耗时：0.0501秒） [XML]
MySQL how to join tables on two fields
...
SELECT *
FROM t1
JOIN t2 USING (id, date)
perhaps you'll need to use INNEER JOIN or
where t2.id is not null
if you want results only matching both conditions
...
GROUP_CONCAT comma separator - MySQL
...
Query to achieve your requirment
SELECT id,GROUP_CONCAT(text SEPARATOR ' ') AS text FROM table_name group by id;
share
|
improve this answer
|
...
Importance of varchar length in MySQL table
...
Anytime your select query uses a temporary table (group and order by operations, among other things) it will convert varchar(200) to a char(200) and performance will suffer.
– Jamie
Feb 7 '13 at 20:1...
The simplest way to resize an UIImage?
...
I've also seen this done as well (which I use on UIButtons for Normal and Selected state since buttons don't resize to fit). Credit goes to whoever the origina
Copy and paste content from one file to another file in vi
... have two putty windows open, I am doing "v for visual mode first and then select all the lines and the do a "y" for yanking, not I am doing an alt+tab to get onto the other file and when I do a "p" for put, it only prints a quotation mark.
– macha
Jan 6 '11 at...
How to change time and timezone in iPhone simulator?
...tiple different time zones: add a TZ setting for each one, but remember to select only one at a time. I just added America/Chicago, Europe/Istanbul, Asia/Hong_Kong, and Pacific/Honolulu to get an assortment so I can track down a timezone-dependent bug. This will NOT work if you need to capture scree...
How do I run NUnit in debug mode from Visual Studio?
...
Be aware that you have to select "Enable Visual Studio Support" on the Settings dialog of NUnit -> IDE Support
– Julio Garcia
Sep 12 '11 at 13:54
...
“Auth Failed” error with EGit and GitHub
...
I resolved it by selecting http as the protocol and giving my GitHub username and password.
share
|
improve this answer
|
...
FontAwesome icons not showing. Why?
...your browsers cache. (On Chrome do a looong click on the reload button and select Hard Cache Reset)
Assure that the <span> or <i> element you use, uses the FontAwesome font family. For example, it must not just
<i class="fa-pencil" title="Edit"></i>
but
<i class="fa fa...
SQL Server Restore Error - Access is Denied
...ried to restore a 2005 .bak file, and i received exactly the same error. I selected the overwrite option as well to no avail.
my solution was to grant the SQL user access to the directory in question, by going to the folder and editing the access rights through the property screen.
...