大约有 5,883 项符合查询结果（耗时：0.0199秒） [XML]
How to export query result to csv in Oracle SQL Developer?
...take an export to your local system from sql developer.
Path : C:\Source_Table_Extract\des_loan_due_dtls_src_boaf.csv
SPOOL "Path where you want to save the file"
SELECT /*csv*/ * FROM TABLE_NAME;
share
...
Paging with Oracle
...ults were returned slightly quicker the first time I ran the queries on my table (113 million+ rows) for the new method:
New method: 0.013 seconds.
Old method: 0.107 seconds.
However, as @wweicker mentioned, the explain plan looks much worse for the new method:
New method cost: 300,110
Old met...
How to create index on JSON field in Postgres?
...
Found:
CREATE TABLE publishers(id INT, info JSON);
CREATE INDEX ON publishers((info->>'name'));
As stated in the comments, the subtle difference here is ->> instead of ->. The former one returns the value as text, the lat...
Check if a given key already exists in a dictionary
...
@Mohan Gulati: You understand that a dictionary is a hashtable of keys mapped to values, right? A hashing algorithm converts the key to an integer and the integer is used to find a location in the hash table that matches. en.wikipedia.org/wiki/Hash_table
– hug...
What is a 'thunk'?
...ayed
computation (similar to a closure)
a feature of some virtual function
table implementations (similar to a
wrapper function)
a mapping of machine data from one
system-specific form to another,
usually for compatibility reasons
I have usually seen it used in the third context.
http://en.wikipe...
What does the git index contain EXACTLY?
...ranch you just switched to.
Git 2.20 (Q4 2018) adds an Index Entry Offset Table (IEOT):
See commit 77ff112, commit 3255089, commit abb4bb8, commit c780b9c, commit 3b1d9e0, commit 371ed0d (10 Oct 2018) by Ben Peart (benpeart).
See commit 252d079 (26 Sep 2018) by Nguyễn Thái Ngọc Duy (pclouds).
...
Why are all fields in an interface implicitly static and final?
...tatic final does not mean they must be compile-time constants, or even immutable. You can define e.g.
interface I {
String TOKEN = SomeOtherClass.heavyComputation();
JButton BAD_IDEA = new JButton("hello");
}
(Beware that doing this inside an annotation definition can confuse javac, relatin...
I do not want to inherit the child opacity from the parent in CSS
...nt effects.
.wrapper {
width: 630px;
height: 420px;
display: table;
background: linear-gradient(
rgba(0,0,0,.8),
rgba(0,0,0,.8)),
url('http://cdn.moviestillsdb.com/sm/35bc3c6a2b791425de6caf8b9391026e/rambo-iii.jpg');
}
h1 {
display: table-cell;
vertical-a...
Fastest way to check if a file exist using standard C++/C++11/C?
... or C++ way to check for existence, though.
– IInspectable
Sep 9 '13 at 21:32
10
stat() seems to ...
How to concatenate strings of a string field in a PostgreSQL 'group by' query?
...e the strings of a field within a group by query. So for example, I have a table:
14 Answers
...