大约有 47,000 项符合查询结果（耗时：0.0596秒） [XML]
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.al
...al code
mask = ((r["dt"] >= startdate) & (r["dt"] <= enddate))
selected = r[mask]
looks correct. However, if you do want and, then instead of a and b use (a-b).any() or (a-b).all().
share
|
...
SQL update trigger only when column is modified
...dDate, ModifiedUser, ModifiedHost, QtyToRepairOld, QtyToRepairNew)
SELECT S.OrderNo, S.PartNumber, GETDATE(), SUSER_NAME(), HOST_NAME(), D.QtyToRepair, I.QtyToRepair FROM SCHEDULE S
INNER JOIN Inserted I ON S.OrderNo = I.OrderNo and S.PartNumber = I.PartNumber
INNER JOIN Dele...
How to display unique records from a has_many through relationship?
...r the SQL DISTINCT stmt (e.g. has_many :products, :through => :orders, :select => "DISTINCT products.*). In the first case, ALL records are fetched and rails removes the duplicates for you. In the later case, only non-duplicate records are fetched from the db so it might offer better performan...
PDO support for multiple queries (PDO_MYSQL, PDO_MYSQLND)
...
Then
try {
$db->query('SET NAMES gbk');
$stmt = $db->prepare('SELECT * FROM 2_1_paidused WHERE NumberRenamed = ? LIMIT 1');
$stmt->execute(array("\xbf\x27 OR 1=1 /*"));
}
catch (PDOException $e){
echo "DataBase Errorz: " .$e->getMessage() .'<br>';
}
catch (Exception $e...
Best way to store time (hh:mm) in a database
...t a glance and performing calculations on them are straightforward.
E.g.
SELECT DATEDIFF(MINUTE, event_start, event_end)
ISO8601 date standard
If using SQLite then you don't have this, so instead use a Text field and store it in ISO8601 format eg.
"2013-01-27T12:30:00+0000"
Notes:
This use...
Is a view faster than a simple query?
...e the indexed view directly, or, more importantly, the query optimizer can select the view if it determines that the view can be substituted for some or all of the query in the lowest-cost query plan. In the second case, the indexed view is used instead of the underlying tables and their ordinary in...
Is R's apply family more than syntactic sugar?
...on.
set.seed(1) #for reproducability of the results
# The data - copied from Joris Meys answer
X <- rnorm(100000)
Y <- as.factor(sample(letters[1:5],100000,replace=T))
Z <- as.factor(sample(letters[1:10],100000,replace=T))
# an R way to generate tapply functionality that is fast and
# ...
TFS Get Specific Version into separate folder
...orer
Drill down to desired file
File > Source Control > View History
Select desired version (Changeset)
Toolbar/Context Menu > Compare
Click in left pane, Select All, Copy, paste into Your Favorite Editor and save
...
Reverting part of a commit with git
... for reverting whole commits. You can use git checkout -p to interactively select bits to revert.
– mipadi
Mar 31 '17 at 18:52
1
...
Having a private branch of a public repo on GitHub?
...repo?
On GitHub, your repository is either public or private; you cannot selectively "privatize" just a branch.
Can I fork my own public repo into my own private branch/fork?
You can clone your public repo to your local machine, branch as needed, and simply not push your "private" branches u...