大约有 40,000 项符合查询结果（耗时：0.0336秒） [XML]
Proper SCSS Asset Structure in Rails
... patterns and elements
@import "type.scss";
@import "forms.scss";
@import "tables.scss";
@import "patterns.scss";
And your application.scss file look like:
@import "bootstrap/bootstrap.scss";
Because of the order of the imports, you can now use the variables, loaded with @import "variables.scss...
PostgreSQL: How to make “case-insensitive” query
...indexes to no longer be seekable. If this is a large or frequently queried table, that could cause trouble. Case-insensitive collation, citext, or a function-based index will improve performance.
– Jordan
Aug 10 '11 at 4:23
...
Scheduling R Script
..., to run scheduler first install below packages
install.packages('data.table')
install.packages('knitr')
install.packages('miniUI')
install.packages('shiny')
install.packages("taskscheduleR", repos = "http://www.datatailor.be/rcube", type =
"source")
After installing go to
**TOOLS...
How to get record created today by rails activerecord?
...ion suggested in the accepted answer can cause performance issues when the table size grows.
Typically, if you perform lookups based on created_at column, add an index on the table in your migration file.
add_index :posts, :created_at
Now, to lookup records created today:
Rails 3/4
Post.where...
what is faster: in_array or isset? [closed]
...
@Fabrizio - Read up on hashing functions and hash tables.
– David Harkness
Nov 20 '12 at 22:54
|
show 5 more commen...
Stretch background image css?
...t to cover the entire cell, then put the content on top of the image.
table {
width: 230px;
}
.style1 {
text-align: center;
height: 35px;
}
.bg {
position: relative;
width: 100%;
height: 100%;
}
.bg img {
display: block;
width: 100%;
height: 100%;
}
.b...
How do I conditionally apply CSS styles in AngularJS?
...
I have found problems when applying classes inside table elements when I had one class already applied to the whole table (for example, a color applied to the odd rows <myClass tbody tr:nth-child(even) td>). It seems that when you inspect the element with Developer Tool...
MIN/MAX vs ORDER BY and LIMIT
...king at an unindexed field, using MIN() requires a single full pass of the table. Using SORT and LIMIT requires a filesort. If run against a large table, there would likely be a significant difference in percieved performance. As a meaningless data point, MIN() took .36s while SORT and LIMIT took...
How do I make a list of data frames?
... data import function for read.csv as appropriate. readr::read_csv or data.table::fread will be faster, or you may also need a different function for a different file type.
Either way, it's handy to name the list elements to match the files
names(my_data) <- gsub("\\.csv$", "", my_files)
# or, ...
Switch on Enum in Java [duplicate]
...r speed, the switch statement approach might be faster because it's just a table lookup in the bytecode. With your approach, you have to push a new function onto the stack. It's a micro-optimization, but if speed is super important it's something to keep in mind.
– DIMMSum
...