大约有 37,000 项符合查询结果（耗时：0.0259秒） [XML]
how to generate migration to make references polymorphic
I have a Products table and want to add a column:
4 Answers
4
...
Can I force a UITableView to hide the separator between empty cells? [duplicate]
When using a plain-style UITableView with a large enough number of cells that the UITableView cannot display them all without scrolling, no separators appear in the empty space below the cells. If I have only a few cells the empty space below them includes separators.
...
MySQL Orderby a number, Nulls last
...sign (-) before the column name and switch the ASC to DESC:
SELECT * FROM tablename WHERE visible=1 ORDER BY -position DESC, id DESC
It is essentially the inverse of position DESC placing the NULL values last but otherwise the same as position ASC.
A good reference is here http://troels.arvin.dk...
vertical-align with Bootstrap 3
... .vertical-align only on specific screen sizes like so:
/* Small devices (tablets, 768px and up) */
@media (min-width: 768px) {
.row.vertical-align {
display: flex;
align-items: center;
}
}
In that case, I'd go with @KevinNelson's approach.
Important note #2: Vendor prefi...
Use didSelectRowAtIndexPath or prepareForSegue method for UITableView?
I'm using storyboards and I have a UITableView. I have a segue setup that pushes from my table to the detail VC. But which method should I use to handle this? I'll have to pass a couple objects to the detail view. But do I use didSelectRowAtIndex or -(void)prepareForSegue:(UIStoryboardSegue *...
psql - save results of command to a file
I'm using psql's \dt to list all tables in a database and I need to save the results.
10 Answers
...
How to count instances of character in SQL Column
...LESCE(NULLIF(LEN(@StringToFind), 0), 1) --protect division from zero
FROM [Table To Search]
share
|
improve this answer
|
follow
|
...
Count the occurrences of DISTINCT values
...
SELECT name,COUNT(*) as count
FROM tablename
GROUP BY name
ORDER BY count DESC;
share
|
improve this answer
|
follow
...
How do I write LINQ's .Skip(1000).Take(100) in pure SQL?
...
(SELECT a,b,c, ROW_NUMBER() OVER (ORDER BY ...) as row_number
FROM Table) t0
WHERE to.row_number BETWEEN 1000 and 1100;
This works, but the need to manufacture the row_number from the ORDER BY may result in your query being sorted on the server side and cause performance problems. Even ...
MySQL - force not to use cache for testing speed of query
...your query.
(MySQL 5.6 users click HERE )
eg.
SELECT SQL_NO_CACHE * FROM TABLE
This will stop MySQL caching the results, however be aware that other OS and disk caches may also impact performance. These are harder to get around.
...