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Fragments within Fragments
...tion to instantiate the fragments everything seems to working correctly at least on a test level right now.
I hope this helps you out.
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What's the difference between istringstream, ostringstream and stringstream? / Why not use stringstr
...an require an adjustment to the vtable pointer. The main difference is (at least in theory) better expressing your intent, and preventing you from accidentally using >> where you intended << (or vice versa). OTOH, the difference is sufficiently small that especially for quick bits of dem...
SQL query to find record with ID not in another table
...es 9.5) using two tables with ~2M rows each. This query below performed at least 5* better than the other queries proposed:
-- Count
SELECT count(*) FROM (
(SELECT id FROM table1) EXCEPT (SELECT id FROM table2)
) t1_not_in_t2;
-- Get full row
SELECT table1.* FROM (
(SELECT id FROM table1)...
How do I perform the SQL Join equivalent in MongoDB?
...devs are being careful to recommend specific use cases for $lookup, but at least as of 3.2 doing join is now possible with MongoDB.
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How to get process ID of background process?
...p 300 &"' & ; pgrep -P $$ , I get on stdout [1] <pid>. So at least it shows something, but this is probably not the output of pgrep`
– Timo
Dec 2 '17 at 8:29
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pandas: multiple conditions while indexing data frame - unexpected behavior
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As you can see, the AND operator drops every row in which at least one
value equals -1. On the other hand, the OR operator requires both
values to be equal to -1 to drop them.
That's right. Remember that you're writing the condition in terms of what you want to keep, not in term...
Stop setInterval call in JavaScript
...); is jQuery, that's why it doesn't work. This should've been mentioned at least.
– paddotk
Jun 16 '15 at 15:07
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sqlalchemy flush() and get inserted id?
...t finding that SQLA is not really that good (having considerable exp in at least 5 major ORMS). Just wrapping on 5+ hours trying to get the row id for a add()->commit()/flush().
– Marc
May 8 '16 at 21:25
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Setting default permissions for newly created files and sub-directories under a directory in Linux?
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Here's how to do it using default ACLs, at least under Linux.
First, you might need to enable ACL support on your filesystem. If you are using ext4 then it is already enabled. Other filesystems (e.g., ext3) need to be mounted with the acl option. In that case, add th...
Covariance, Invariance and Contravariance explained in plain English?
...e. Formally speaking, f(A) = parametertype(method asdeclaredin(A)) must at least be contravariant, and if f(A) = returntype(method asdeclaredin(A)) must at least be covariant.
Note the "at least" above. Those are minimum requirements any reasonable statically type safe object oriented programming l...