大约有 5,886 项符合查询结果（耗时：0.0208秒） [XML]
Select records from NOW() -1 Day
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Sure you can:
SELECT * FROM table
WHERE DateStamp > DATE_ADD(NOW(), INTERVAL -1 DAY)
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What is a deadlock?
...s much as you can.
In databases avoid making lots of changes to different tables in a single transaction, avoid triggers and switch to optimistic/dirty/nolock reads as much as possible.
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Sending a message to nil in Objective-C
...gt; 0 )
or this:
return [myArray count]; // say for number of rows in a table
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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.
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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)
PHP exec() vs system() vs passthru()
...egardless, I suggest you not use any of them. They all produce highly unportable code.
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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
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