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Reading Excel files from C#
...ironment, to pull large amounts of data from a variety of Excel files into SQL Server Compact. It works very well and it's rather robust.
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answered Sep 8 '10 at 8:45
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Is there any difference between a GUID and a UUID?
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One difference between GUID in SQL Server and UUID in PostgreSQL is letter case; SQL Server outputs upper while PostgreSQL outputs lower.
The hexadecimal values "a" through "f" are output as lower case characters and are case insensitive on input. - rfc41...
How to change owner of PostgreSql database?
I need to change the owner of PostgreSql database.
2 Answers
2
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Permanently Set Postgresql Schema Path
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for those wondering from the psql command line you can list schemas by \dn
– BKSpurgeon
Sep 30 '16 at 1:00
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Oracle Differences between NVL and Coalesce
...null as a from dual
) ;
succeeds.
More information : http://www.plsqlinformation.com/2016/04/difference-between-nvl-and-coalesce-in-oracle.html
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Postgres unique constraint vs index
... "master_unique_idx" UNIQUE, btree (ind_id)
In table description (\d in psql) you can tell unique constraint from unique index.
Uniqueness
Let's check uniqueness, just in case.
test=# insert into master values (0, 0);
INSERT 0 1
test=# insert into master values (0, 1);
ERROR: duplicate key val...
What is a domain specific language? Anybody using it? And in what way?
... system figures out the how.
Examples of DSL include all query languages (SQL, XPath, ...), all template languages (Django, Smarty, ...), shell scripts, especially including stuff like twill, a command driven web browser (mostly used for automated test), data storage and exchange languages (XML, YA...
How do you run a single query through mysql from the command line?
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mysql -u <user> -p -e "select * from schema.table"
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Get top n records for each group of grouped results
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Here is one way to do this, using UNION ALL (See SQL Fiddle with Demo). This works with two groups, if you have more than two groups, then you would need to specify the group number and add queries for each group:
(
select *
from mytable
where `group` = 1
order by...
Interface or an Abstract Class: which one to use?
...umber;
public $DateHired;
public function write_info(){
//sql codes here
echo "Writing ". $this->LastName . "'s info to emloyee dbase table <br>";
}
}
final class student extends person{
public $StudentNumber;
public $CourseName;
public functio...