大约有 35,460 项符合查询结果（耗时：0.0393秒） [XML]
Rails find record with zero has_many records associated [duplicate]
...
Bah, found it here: https://stackoverflow.com/a/5570221/417872
City.includes(:photos).where(photos: { city_id: nil })
share
|
improve this answer
|
...
argparse module How to add option without any argument?
...
answered Mar 11 '11 at 10:25
jfsjfs
326k132132 gold badges817817 silver badges14381438 bronze badges
...
Accessing a class's constants
...
answered Jun 21 '11 at 15:09
Dylan MarkowDylan Markow
115k2323 gold badges272272 silver badges195195 bronze badges
...
Access to Modified Closure
...
Alex Wiese
7,54044 gold badges3838 silver badges6666 bronze badges
answered Oct 24 '08 at 22:20
Jon SkeetJon Skeet
...
jQuery append() vs appendChild()
...
105
The main difference is that appendChild is a DOM method and append is a jQuery method. The seco...
Counting Chars in EditText Changed Listener
...
Tim
36.1k1313 gold badges109109 silver badges129129 bronze badges
answered Nov 30 '10 at 4:41
xtemporextempore
...
Why do I get “Procedure expects parameter '@statement' of type 'ntext/nchar/nvarchar'.” when I try t
...ll give the error because @SQL needs to be NVARCHAR
DECLARE @SQL VARCHAR(100)
SET @SQL = 'SELECT TOP 1 * FROM sys.tables'
EXECUTE sp_executesql @SQL
So:
DECLARE @SQL NVARCHAR(100)
SET @SQL = 'SELECT TOP 1 * FROM sys.tables'
EXECUTE sp_executesql @SQL
...
What is the difference between Eclipse for Java (EE) Developers and Eclipse Classic?
...
answered Nov 18 '10 at 10:27
Buhake SindiBuhake Sindi
80.6k2626 gold badges154154 silver badges219219 bronze badges
...
How to convert std::string to LPCSTR?
...LPCSTR (Long Pointer to Constant STRing) -- means that it's a pointer to a 0 terminated string of characters. W means wide string (composed of wchar_t instead of char).
share
|
improve this answer
...
What does the (unary) * operator do in this Ruby code?
...
answered May 27 '09 at 23:27
molfmolf
66.4k1313 gold badges129129 silver badges114114 bronze badges
...