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How to undo “git commit --amend” done instead of “git commit”
I accidentally amended my previous commit. The commit should have been separate to keep history of the changes I made to a particular file.
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SQL JOIN - WHERE clause vs. ON clause
... had a worse case that was 10x more costly than the hash. This was using a set of IDs rather than a single ID.
– JamesHutchison
Mar 29 '16 at 17:15
13
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Launch custom android application from android browser
...wser.
to solve this, so that it launches properly from CHROME you have to set intent filter like this
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android....
Read specific columns from a csv file with csv module?
I'm trying to parse through a csv file and extract the data from only specific columns.
11 Answers
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SecItemAdd and SecItemCopyMatching returns error code -34018 (errSecMissingEntitlement)
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iOS 10 / XCode 8 Fix:
Add KeyChain Entitlement, Go to project
settings->Capabilities->Keychain Sharing->Add Keychain Groups+Turn On
An answer here, from Apple:
UPDATE: We have finally been able to reproduce the -34018 error on iOS
8.3. This is the first step in identif...
how to emulate “insert ignore” and “on duplicate key update” (sql merge) with postgresql?
...e; copy temporary_table from 'data_file.csv'; lock table test; update test set data=temporary_table.data from temporary_table where test.id=temporary_table.id; insert into test select * from temporary_table where id not in (select id from test) as a"
– Tometzky
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Postgres unique constraint vs index
...m the definition of create table ....
In unique index declaration you can set WHERE clause to create partial index.
You can also create index on expression (not only on column) and define some other parameters (collation, sort order, NULLs placement).
You cannot add table constraint using partial...
Good Hash Function for Strings
I'm trying to think up a good hash function for strings. And I was thinking it might be a good idea to sum up the unicode values for the first five characters in the string (assuming it has five, otherwise stop where it ends). Would that be a good idea, or is it a bad one?
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Hibernate: hbm2ddl.auto=update in production?
...r app evolves with new features.
Basically, you keep an XML file of changesets that you continue to add to as your application evolves. This file is kept in git (or whatever you are using) with the rest of your project. When your app is deployed, Liquibase checks it's changelog table in the DB yo...
Workflow for statistical analysis and report writing
...an repeat steps 1 & 2 which can take a long time to run for large data sets.
do.R: Calls the functions defined in func.R to perform the analysis and produce charts and tables.
The main motivation for this set up is for working with large data whereby you don't want to have to reload the data e...