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Why use a prime number in hashCode?
...es by 31 will perform non-optimally. However, I would consider such a hash table implementation poorly designed, given how common 31 as a multiplier is.
– ILMTitan
Aug 31 '10 at 21:42
...
How to prevent a jQuery Ajax request from caching in Internet Explorer?
...
you can define it like this :
let table = $('.datatable-sales').DataTable({
processing: true,
responsive: true,
serverSide: true,
ajax: {
url: "<?php echo site_url("your url"); ?>",
cache: false,
...
Oracle “Partition By” Keyword
...ment for every employee record. (It is as if you're de-nomalising the emp table; you still return every record in the emp table.)
emp_no dept_no DEPT_COUNT
1 10 3
2 10 3
3 10 3 <- three because there are three "dept_no = 10" records
4 20 2
5 ...
Calling a function within a Class method?
...ults inside the class function? e.g I have a query that selects all from a table and then returns a fetch all result set. Is it possible to loop through that result set inside a classes function? e.g class query{ public function show(){ getResults(); while($stmt->fetchCollumn()){ ECHO RESULTS ...
Logical operators for boolean indexing in Pandas
...[4])
>>> a3[np.bitwise_and(a1, a2)]
array([1, 1, 1, 2])
Summary table
Logical operator | NumPy logical function | NumPy bitwise function | Bitwise operator
-------------------------------------------------------------------------------------
and | np.logical_and | np...
MySQL select one column DISTINCT, with corresponding other columns
...
try this query
SELECT ID, FirstName, LastName FROM table GROUP BY(FirstName)
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How can bcrypt have built-in salts?
...k. It's meant to prevent an attacker with read-only access to the password table from authenticating. For example, you get a backup tape with the table on it.
– erickson
Aug 6 '14 at 22:38
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align right in a table cell with CSS
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It depends. I have a paragraph, which is block, inside a table cell (css display: table-cell), and if I give that paragraph a width of 100% it starts to respect text-align right. I assume defining a width isn't always the best thing.
– Costa
M...
Create nice column output in python
...to set the columns to a minimum of 20 characters and align text to right.
table_data = [
['a', 'b', 'c'],
['aaaaaaaaaa', 'b', 'c'],
['a', 'bbbbbbbbbb', 'c']
]
for row in table_data:
print("{: >20} {: >20} {: >20}".format(*row))
Output:
a ...
App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎...
...数据表
创建一个测试数据表，sql如下：
CREATE TABLE users (
id INTEGER PRIMARY KEY,
name TEXT,
age INTEGER);
数据表信息
这时，可以查看一下表信息：
插入数据
往 users 表中插入...