大约有 5,881 项符合查询结果（耗时：0.0250秒） [XML]
Sending a message to nil in Objective-C
...gt; 0 )
or this:
return [myArray count]; // say for number of rows in a table
share
|
improve this answer
|
follow
|
...
What is the difference between char, nchar, varchar, and nvarchar in SQL Server?
...rt of this actually depends on collation as illustrated below.
DECLARE @T TABLE
(
C1 VARCHAR(20) COLLATE Chinese_Traditional_Stroke_Order_100_CS_AS_KS_WS,
C2 NVARCHAR(20)COLLATE Chinese_Traditional_Stroke_Order_100_CS_AS_KS_WS
)
INSERT INTO @T
VALUES (N'中华人民共和国',N'中华人民...
Checkbox for nullable boolean
...our radio buttons go horizontal (display: inline-block), vertical, or in a table fashion (display: inline-block; width:100px;)
In the model (I'm using string, string for the dictionary definition as a pedagogical example. You can use bool?, string)
public IEnumerable<SelectListItem> Sexsli {...
Group by multiple columns in dplyr, using string vector input
...e
df2 <- plyr::ddply(data, columns, plyr::summarize, value=mean(value))
table(df1 == df2, useNA = 'ifany')
## TRUE
## 27
The output from your example question is as expected (see comparison to plyr above and output below):
# A tibble: 9 x 3
# Groups: asihckhdoydkhxiydfgfTgdsx [?]
asihck...
How to check if a model has a certain column/attribute?
...that needs to loop through a hash and check if each key exists in a models table, otherwise it will delete the key/value.
3...
ERROR 2006 (HY000): MySQL server has gone away
... changes to /etc/my.cnf file as well as appending those flags, some of the tables were missing after the import.
System used: OSX El Capitan 10.11.5; mysql Ver 14.14 Distrib 5.5.51 for osx10.8 (i386)
Programmer Puzzle: Encoding a chess board state throughout a game
... we can determine all the legal moves from the current position in a predictable and deterministic way and state which we’ve chosen. This then goes back to the variable base encoding mentioned above. White and Black have 20 possible moves each on their first move, more on the second and so on.
Co...
PHP exec() vs system() vs passthru()
...egardless, I suggest you not use any of them. They all produce highly unportable code.
share
|
improve this answer
|
follow
|
...
Django - filtering on foreign key properties
I'm trying to filter a table in Django based on the value of a particular field of a ForeignKey .
3 Answers
...
Using PassportJS, how does one pass additional form fields to the local authentication strategy?
...have two options: one is email and the other is phonenumber. and the login table contains these two field along with password.
– Mathew John
Jan 11 '18 at 10:33
...