大约有 47,000 项符合查询结果（耗时：0.0419秒） [XML]
Why does Haskell's “do nothing” function, id, consume tons of memory?
Haskell has an identity function which returns the input unchanged. The definition is simple:
1 Answer
...
SQLite - UPSERT *not* INSERT or REPLACE
...
Assuming three columns in the table: ID, NAME, ROLE
BAD: This will insert or replace all columns with new values for ID=1:
INSERT OR REPLACE INTO Employee (id, name, role)
VALUES (1, 'John Foo', 'CEO');
BAD: This will i...
For each row return the column name of the largest value
...have a roster of employees, and I need to know at what department they are in most often. It is trivial to tabulate employee ID against department name, but it is trickier to return the department name, rather than the number of roster counts, from the frequency table. A simple example below (column...
How to get the data-id attribute?
I'm using the jQuery quicksand plugin. I need to get the data-id of the clicked item and pass it to a webservice.
How do I get the data-id attribute? I'm using the .on() method to re-bind the click event for sorted items.
...
Oracle “(+)” Operator
I am checking some old SQL Statements for the purpose of documenting them and probably enhancing them.
4 Answers
...
How can you make a custom keyboard in Android?
I want to make a custom keyboard. I don't know how to do it using XML and Java. The following picture is a model of the keyboard I want to make. It only needs numbers.
...
How to conditionally push an item in an observable array?
...ervableArray , but only if the item is not already present. Is there any "find" function or recommended pattern for achieving this in KnockoutJS?
...
SQL server query to get the list of columns in a table along with Data types, NOT NULL, and PRIMARY
I need to write a query on SQL server to get the list of columns in a particular table, its associated data types (with length) and if they are not null. And I have managed to do this much.
...
Rails has_and_belongs_to_many migration
...
You need to add a separate join table with only a restaurant_id and user_id (no primary key), in alphabetical order.
First run your migrations, then edit the generated migration file.
Rails 3
rails g migration create_restaurants_users_table
Rails 4...
Passport.js - Error: failed to serialize user into session
...dn't implement passport.serializeUser and passport.deserializeUser. Try adding this:
passport.serializeUser(function(user, done) {
done(null, user);
});
passport.deserializeUser(function(user, done) {
done(null, user);
});
...