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MySQL, update multiple tables with one query
...ase, we increase the number of books in a particular order with Order.ID = 1002 in Orders table then we also need to reduce that the total number of books available in our stock by the same number in Books table.
UPDATE Books, Orders
SET Orders.Quantity = Orders.Quantity + 2,
Books.InStock = Boo...
Easiest way to upgrade eclipse 3.7 to 4.2 (Juno)
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157
Eclipse can barely update from 3.7.1 to 3.7.2, never mind from 3.7 to 4.2.
You're taking the ...
How big is too big for a PostgreSQL table?
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118
Rows per a table won't be an issue on it's own.
So roughly speaking 1 million rows a day for ...
Does file_get_contents() have a timeout setting?
...g the file_get_contents() method in a loop. Each link may take more than 15 minutes to process. Now, I worry about whether PHP's file_get_contents() has a timeout period?
...
In javascript, is an empty string always false as a boolean?
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196
Yes. Javascript is a dialect of ECMAScript, and ECMAScript language specification clearly defi...
Heroku error: “Permission denied (public key)”
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217
Try heroku keys:add <path-to-your-public-key>.
For example, heroku keys:add ~/.ssh/id_r...
What is the “realm” in basic authentication
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From RFC 1945 (HTTP/1.0) and RFC 2617 (HTTP Authentication referenced by HTTP/1.1)
The realm attribute (case-insensitive) is required for all
authentication schemes which issue a challenge. The realm value
(case-sensitive), in...
How to move certain commits to be based on another branch in git?
...should begin)
git checkout master
# replay every commit *after* quickfix1 up to quickfix2 HEAD.
git rebase --onto master quickfix1 quickfix2
So you should go from
o-o-X (master HEAD)
\
q1a--q1b (quickfix1 HEAD)
\
q2a--q2b (quickfix2 HEAD)
to:
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How do I retrieve the number of columns in a Pandas data frame?
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312
Like so:
import pandas as pd
df = pd.DataFrame({"pear": [1,2,3], "apple": [2,3,4], "orange": [...
Common MySQL fields and their appropriate data types
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71
Someone's going to post a much better answer than this, but just wanted to make the point that p...