09-16-2010
what exactly are you trying to do logically? what DBMS?
9 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi,
I am a new learner of join command. Some result really make me confused.
Please kindly help me.
input:
file1:
LEO oracle engineer 210375
P.Jones Office Runner ID897
L.Clip Personl Chief ID982
S.Round UNIX admin ID6
file2:
Dept2C ID897 6 years
Dept5Z ID982 1 year
Dept3S ID6 2... (1 Reply)
Discussion started by: summer_cherry
1 Replies
2. Programming
I have a stored procedure that is failing. The current query behind it is:
SELECT DISTINCT
<many, many values>
FROM
table1
LEFT OUTER JOIN table2 ON
(table2.key =
(select max (table2.key) from table2
where table2.key = table1.key) or
... (0 Replies)
Discussion started by: Elric of Grans
0 Replies
3. Programming
example sql:
select a.a1,b.b1,c.c1,d.d1,e.e1
from a
left outer join b on a.x=b.x
left outer join c on b.y=c.y
left outer join d on d.z=a.z
inner join a.t=e.t
I know how single outer or inner join works in sql.
But I don't really understand when there are multiple of them.
can... (0 Replies)
Discussion started by: robbiezr
0 Replies
4. UNIX for Dummies Questions & Answers
Hello,
My apologies if this has been posted elsewhere, I have had a look at several threads but I am still confused how to use these functions. I have two files, each with 5 columns:
File A: (tab-delimited)
PDB CHAIN Start End Fragment
1avq A 171 176 awyfan
1avq A 172 177 wyfany
1c7k A 2 7... (3 Replies)
Discussion started by: InfoSeeker
3 Replies
5. UNIX for Dummies Questions & Answers
file1:
Toronto:12439755:1076359:July 1, 1867:6
Quebec City:7560592:1542056:July 1, 1867:5
Halifax:938134:55284:July 1, 1867:4
Fredericton:751400:72908:July 1, 1867:3
Winnipeg:1170300:647797:July 15, 1870:7
Victoria:4168123:944735:July 20, 1871:10
Charlottetown:137900:5660:July 1, 1873:2... (2 Replies)
Discussion started by: mindfreak
2 Replies
6. UNIX for Dummies Questions & Answers
Hi,
I have 20 tab delimited text files that have a common column (column 1). The files are named GSM1.txt through GSM20.txt. Each file has 3 columns (2 other columns in addition to the first common column).
I want to write a script to join the files by the first common column so that in the... (5 Replies)
Discussion started by: evelibertine
5 Replies
7. Shell Programming and Scripting
Hi I'm comparing same files names which are in different folders .
The first for loop for the files in DAY1 folder and
the second for loop for the files in DAY2 folder .
the first IF condition is for checking whether the file names are equal
the second If condtion is for checking the... (4 Replies)
Discussion started by: smile689
4 Replies
8. UNIX for Dummies Questions & Answers
Hello.. I am trying to join two files of about 7000 records. it looked quite straight forward when i began, but i'm not getting the desired output.
here is what i'm trying to do:
cat xxx
item,So,Mo,Tu
aaa,1,1,1
bbb,1,1,4
ccc,1,1,0
ddd,1,1,1
cat yyy
item,Tu,We
aaa,1,1
bbb,4,0... (7 Replies)
Discussion started by: wanderingmind16
7 Replies
9. Shell Programming and Scripting
Hello,
This post is already here but want to do this with another way
Merge multiples files with multiples duplicates keys by filling "NULL" the void columns for anothers joinning files
file1.csv:
1|abc
1|def
2|ghi
2|jkl
3|mno
3|pqr
file2.csv:
1|123|jojo
1|NULL|bibi... (2 Replies)
Discussion started by: yjacknewton
2 Replies
LEARN ABOUT DEBIAN
netsds::dbi
NetSDS::DBI(3pm) User Contributed Perl Documentation NetSDS::DBI(3pm)
NAME
NetSDS::DBI - DBI wrapper for NetSDS
SYNOPSIS
use NetSDS::DBI;
$dbh = NetSDS::DBI->new(
dsn => 'dbi:Pg:dbname=test;host=127.0.0.1;port=5432',
login => 'user',
passwd => 'topsecret',
);
print $db->call("select md5(?)", 'zuka')->fetchrow_hashref->{md5};
DESCRIPTION
"NetSDS::DBI" module provides wrapper around DBI module.
CLASS API
new(%params) - class constructor
$dbh = NetSDS::DBI->new(
dsn => 'dbi:Pg:dbname=test;host=127.0.0.1;port=5432',
login => 'user',
passwd => 'topsecret',
);
dbh() - DBI connection handler accessor
Returns: DBI object
This method provides accessor to DBI object and for low level access to database specific methods.
Example (access to specific method):
my $quoted = $db->dbh->quote_identifier(undef, 'auth', 'services');
# $quoted contains "auth"."services" now
call($sql, @bind_params) - prepare and execute SQL query
Method "call()" implements the following functionality:
* check connection to DBMS and restore it
* prepare chached SQL statement
* execute statement with bind parameters
Parameters:
* SQL query with placeholders
* bind parameters
Return:
* statement handler from DBI
Example:
$sth = $dbh->call("select * from users");
while (my $row = $sth->fetchrow_hashref()) {
print $row->{username};
}
fetch_call($sql, @params) - call and fetch result
Paramters: SQL query, parameters
Returns: arrayref of records as hashrefs
Example:
# SQL DDL script:
# create table users (
# id serial,
# login varchar(32),
# passwd varchar(32)
# );
# Now we fetch all data to perl structure
my $table_data = $db->fetch_call("select * from users");
# Process this data
foreach my $user (@{$table_data}) {
print "User ID: " . $user->{id};
print "Login: " . $user->{login};
}
begin() - start transaction
commit() - commit transaction
rollback() - rollback transaction
quote() - quote SQL string
Example:
# Encode $str to use in queries
my $str = "some crazy' string; with (dangerous characters";
$str = $db->quote($str);
INTERNAL METHODS
_add_sets() - add initial SQL query
Example:
$obj->_add_sets("set search_path to myscheme");
$obj->_add_sets("set client_encoding to 'UTF-8'");
_add_attrs() - add DBI handler attributes
$self->_add_attrs(AutoCommit => 1);
_check_connection() - ping and reconnect
Internal method checking connection and implement reconnect
_connect() - connect to DBMS
Internal method starting connection to DBMS
EXAMPLES
samples/testdb.pl
SEE ALSO
DBI, DBD::Pg
TODO
1. Make module less PostgreSQL specific.
AUTHOR
Michael Bochkaryov <misha@rattler.kiev.ua>
LICENSE
Copyright (C) 2008-2009 Net Style Ltd.
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
perl v5.10.1 2010-04-28 NetSDS::DBI(3pm)