大约有 43,000 项符合查询结果（耗时：0.0558秒） [XML]
Inner join vs Where
...="T2"."ID"))
-- 2 table access full table1
-- 3 table access full table2
And the execution plan for the query using a WHERE clause.
-- with where clause
EXPLAIN PLAN FOR
SELECT * FROM table1 t1, table2 t2
WHERE t1.id = t2.id;
SELECT *
FROM TABLE (DBMS_XPLAN.DISPLAY);
-- 0 select statement
-- 1...
Create PostgreSQL ROLE (user) if it doesn't exist
...catch only this one error. As other answers mentioned it is a good idea to convert fatal error to simple notice. Other PostgreSQL IF NOT EXISTS commands adds , skipping into their message, so for consistency I'm adding it here too.
Here is full SQL code for simulation of CREATE ROLE IF NOT EXISTS w...
Is it possible to change the textcolor on an Android SearchView?
...ny properties for changing the text color. The default text color is black and doesn't work on our dark background. Is there a way to change the color of the text without resorting to hacks?
...
How to get a list of installed Jenkins plugins with name and version pair
...
Worked well for me on Mac OS X. I wanted to convert the output to a plain text list, so used some Perl regex to strip the tags: curl 'http://192.168.197.133:8080/pluginManager/api/xml?depth=1&xpath=/*/*/shortName|/*/*/version&wrapper=plugins' | perl -pe 's/.*?&...
Why does a RegExp with global flag give wrong results?
...'.match(re); // -> true
!!'Foo Bar'.match(re); // -> true
Note: !! converts it to a boolean and then inverts the boolean so it reflects the result.
Alternatively, you could just reset the lastIndex property:
result.push(re.test('Foo Bar'));
re.lastIndex = 0;
result.push(re.test('Foo Bar'))...
Hyphenated html attributes with asp.net mvc
...erscore in the data attribute name, and it'll magically handle it for you, converting it to a hyphen. It knows you want a hyphen rather than an underscore as underscores aren't valid in html attribute names.
<%= Html.TextBox("name", value, new { @data_foo = "bar"}) %>
...
Finding Variable Type in JavaScript
...boxed object is created, using them as functions can be actually be useful converting from other types. Boolean(0) === false, Number(true) === 1
– Juan Mendes
Jul 16 '18 at 15:08
...
Printing tuple with string formatting in Python
...
Note that the % syntax is obsolete. Use str.format, which is simpler and more readable:
t = 1,2,3
print 'This is a tuple {0}'.format(t)
share
|
improve this answer
|
...
PHP Pass by reference in foreach [duplicate]
...ill become a normal variable (Since no one else is pointing to $a[0] it is converted to a normal variable. PHP is smart enough to make it a normal variable when no one else is pointing towards it)
This is what happens in the first loop
foreach ($a as &$v) {
}
After the last iteration $a[3...
How do I join two lists in Java?
...
It is ugly but at least its fluent and can be used without multi line lambdas. I really wish there was a fluent addAll that returned the concatinated list.
– Usman Ismail
Jan 11 '18 at 15:06
...