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Psql list all tables
I would like to list all tables in the liferay database in my PostgreSQL install. How do I do that?
6 Answers
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Difference between EXISTS and IN in SQL?
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The exists keyword can be used in that way, but really it's intended as a way to avoid counting:
--this statement needs to check the entire table
select count(*) from [table] where ...
--this statement is true as soon as one match is found
exists ( select * from [table] ...
Getting all file names from a folder using C# [duplicate]
I wanted to know if it is possible to get all the names of text files in a certain folder.
7 Answers
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Is there a way to get a collection of all the Models in your Rails app?
Is there a way that you can get a collection of all of the Models in your Rails app?
28 Answers
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How to remove all white spaces in java [duplicate]
...of it requires me to make code that reads a line from the user and removes all the white space within that line.
the line can consist of one word or more.
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Check if all elements in a list are identical
... = next(iterator)
except StopIteration:
return True
return all(first == rest for rest in iterator)
One-liner:
def checkEqual2(iterator):
return len(set(iterator)) <= 1
Also one-liner:
def checkEqual3(lst):
return lst[1:] == lst[:-1]
The difference between the 3 versi...
Create new user in MySQL and give it full access to one database
...r'@'hostname';
Try this to give it access to the database dbTest:
GRANT ALL PRIVILEGES ON dbTest.* To 'user'@'hostname' IDENTIFIED BY 'password';
If you are running the code/site accessing MySQL on the same machine, hostname would be localhost.
Now, the break down.
GRANT - This is the command...
Remove All Event Listeners of Specific Type
I want to remove all event listeners of a specific type that were added using addEventListener() . All the resources I'm seeing are saying you need to do this:
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JPA CascadeType.ALL does not delete orphans
...eType.DELETE_ORPHAN, which can be used in conjunction with JPA CascadeType.ALL.
If you don't plan to use Hibernate, you'll have to explicitly first delete the child elements and then delete the main record to avoid any orphan records.
execution sequence
fetch main row to be deleted
fetch child...
Search for all occurrences of a string in a mysql database [duplicate]
I'm trying to figure out how to locate all occurrences of a url in a database. I want to search all tables and all fields. But I have no idea where to start or if it's even possible.
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