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How do you organise multiple git repositories, so that all of them are backed up together?
...stem hierarchy including its own bin and lib dirs. There is script in the root of this tree that will setup your environment to add these bin, lib, etc... other dirs to the proper environment variables. So the root directory essentially looks like:
./bin/ # prepended to $PATH
./lib/ ...
Does using final for variables in Java improve garbage collection?
...sweep GC algorithm, which has to examine all the live refereces in the GC "root" locations (like all the objects in the current call stack). Each live object is "marked" as being alive, and any object referred to by a live object is also marked as being alive.
After the completion of the mark phase...
relative path in BAT script
...r
bin\Iris.exe
(no leading slash - because that means start right from the root)
or \Program\bin\Iris.exe (full path)
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How do you create a read-only user in PostgreSQL?
...user in PostgreSQL that can only do SELECTs from a particular database. In MySQL the command would be:
11 Answers
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How to write DataFrame to postgres table?
There is DataFrame.to_sql method, but it works only for mysql, sqlite and oracle databases. I cant pass to this method postgres connection or sqlalchemy engine.
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Can git ignore a specific line?
... of do it with git filters:
Create/Open gitattributes file:
<project root>/.gitattributes (will be committed into repo)
OR
<project root>/.git/info/attributes (won't be committed into repo)
Add a line defining the files to be filtered:
*.rb filter=gitignore, i.e. run filter named gi...
Change default global installation directory for node.js modules in Windows?
...LDIR=C:\ProgramData\nodejs'"
Then create a folder called npm-cache at the root of the installation directory, which after following above would be C:\ProgramData\nodejs\npm-cache.
Create a folder called etc at the root of the installation directory, which after following above would be C:\ProgramD...
How can I alter a primary key constraint using SQL syntax?
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ALTER TABLE db.table DROP PRIMARY KEY is for MySQL. (Not MSSQL.)
– Roy Latham
Sep 25 at 16:43
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What does SQL clause “GROUP BY 1” mean?
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Not the answer you're looking for? Browse other questions tagged mysql sql group-by or ask your own question.
Primary key or Unique index?
...hen it tries to insert the value 1 into this column for a second time.
In MySQL a unique constraint allows multiple NULLs.
It is possible to make a unique index on mutiple columns.
Primary key versus unique index
Things that are the same:
A primary key implies a unique index.
Things that are...