大约有 41,000 项符合查询结果（耗时：0.0426秒） [XML]
Fastest check if row exists in PostgreSQL
...
Use the EXISTS key word for TRUE / FALSE return:
select exists(select 1 from contact where id=12)
share
|
improve this answer
|
follow
...
Remove trailing zeros
...
You should put there 28 '#' chars, see blackwasp.co.uk/DecimalTrailingZeroes.aspx.
– Jaime Hablutzel
Jun 18 '17 at 16:29
...
How to do a FULL OUTER JOIN in MySQL?
...MPLE transcribed from this SO question you have:
with two tables t1, t2:
SELECT * FROM t1
LEFT JOIN t2 ON t1.id = t2.id
UNION
SELECT * FROM t1
RIGHT JOIN t2 ON t1.id = t2.id
The query above works for special cases where a FULL OUTER JOIN operation would not produce any duplicate rows. The quer...
Get list of all tables in Oracle?
...
SELECT owner, table_name
FROM dba_tables
This is assuming that you have access to the DBA_TABLES data dictionary view. If you do not have those privileges but need them, you can request that the DBA explicitly grants you...
How to get label of select option with jQuery?
The value can be retrieved by $select.val() .
11 Answers
11
...
Get selected text from a drop-down list (select box) using jQuery
How can I get the selected text (not the selected value) from a drop-down list in jQuery?
34 Answers
...
How to generate a random string in Ruby
I'm currently generating an 8-character pseudo-random uppercase string for "A" .. "Z":
50 Answers
...
Changing one character in a string
What is the easiest way in Python to replace a character in a string?
11 Answers
11
...
@synthesize vs @dynamic, what are the differences?
... [invocation setReturnValue:&obj];
}
}
@end
int main(int argc, char **argv)
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
Book *book = [[Book alloc] init];
printf("%s is written by %s\n", [book.title UTF8String], [book.author UTF8String]);
book.title = @"...
jquery select change event get selected option
I bound an event on the change event of my select elements with this:
9 Answers
9
...