I have a working SQL-Query here, in which I'm using subqueries to get the needed result.
The idea behind this, is to get a list of networks which have 2 tags set in the database. Because of the way it is stored, i get a tuple for each Tag, so I get a duplicate of all networks.
The Tables and the query:
The result without the subqueries:
Subqueries are evil in terms of performance. The last time I worked with this, I wrapped it in some lines of code and sorted out the duplicates.
I'm wondering if there's not a more clever alternative in plain SQL, which is not such a performance killer than the subqueries.
I have a script that looks for all jobs that contain a particular calendar.
Some of the calendars have '&' in them and sql freaks out when it encounters that.. is there a way around this?
I have tried:
select job_name from job where run_calendar='1&15dom'
select job_name from job... (3 Replies)
Hi ...
I am doing a switch user and then rsh and then running a sql query .
I am successfull in rsh and logging into the database , but my query doesnt run ..
Here's the command :
su - linus -c "rsh -l linus psmf ORACLE_SID=SMP;export ORACLE_SID;sqlplus... (1 Reply)
Hello Everyone,
I am looking to write a script that will run on many machines in a network at the same time. They need to write a result to a common location. I plan to use a SQLlite database as this common writing point. But the concern I have is how SQLlite will react to multiple writes that... (1 Reply)
Hi,
I am passing an argument for the script and that argument values should exist in database.
bill_period_input="'""$1""'"
bill_period=`sqlplus uname/pwd@dbname <<eof!
set verify off
set heading off
set feedback off
select bill_period from bill_period_ref where... (4 Replies)
Hi ,
I used the below script to get the sql data into csv file using unix scripting.
I m getting the output into an output file but the output file is not displayed in a separe columns .
#!/bin/ksh
export FILE_PATH=/maav/home/xyz/abc/
rm $FILE_PATH/sample.csv
sqlplus -s... (2 Replies)
Hi Everyone,
Can anyone pls help me out......with my requirement, i am struggling since 3 days. Please find the requirement below
my file contains below data
R1|Array/Network Resistor - VIP|V_RES_CLASS|V_MOUNT_FEATURE|SURFACE MOUNT|AND|8533.10.00.20|8533.10.00.20|
R1|Array/Network Resistor... (9 Replies)
I used the following code
code
select * from tablename where columnname
Instead of printing the expected output it prints all the files in the present directory since there is a "*" in the code. Is there any way to overcome the problem?
Thanks
Ananth (2 Replies)
Hi, this's Pom. I'm quite a new one for shell script but I have to do sql on shell script to query some information from database.
I found a concern to get a new line...When I run my script, it retrieves all data as wondering but it's shown in one line :(
What should I do? I'm not sure that... (2 Replies)
Hi All ,
I have tried many times am getting syntax error on 'UNION'
can anybody tell me ...
INSERT INTO table1
(
Type
, num_items
, num_letters
, total_value
)
(select
type='1',
num_items,
num_letters=count(*),
total_value=sum(letter_value)
from
table2
where
num_items = 1 (1 Reply)
Hello All,
I hope I'm posting this in the right section.
I have zero sql query writing skill, in fact, I've never done it before, but for some reason, a request came across my desk to get information from one of our databases. I have about 200 ticket numbers that have no information attached,... (8 Replies)
Discussion started by: bbbngowc
8 Replies
LEARN ABOUT DEBIAN
data::phrasebook::sql
Data::Phrasebook::SQL(3pm) User Contributed Perl Documentation Data::Phrasebook::SQL(3pm)NAME
Data::Phrasebook::SQL - The SQL/DBI Phrasebook Model.
SYNOPSIS
use Data::Phrasebook;
use DBI;
my $dbh = DBI->connect(...);
my $book = Data::Phrasebook->new(
class => 'SQL',
dbh => $dbh,
file => 'queries.txt',
);
my $q = $book->query( 'find_author', {
author => "Lance Parkin"
});
while ( my $row = $q->fetchrow_hashref ) {
print "He wrote $row->{title}
";
}
$q->finish;
queries.txt:
find_author=select title,author from books where author = :author
DESCRIPTION
In order to make use of features like placeholders in DBI in conjunction with phrasebooks, it's helpful to have a phrasebook be somewhat
more aware of how DBI operates. Thus, you get "Data::Phrasebook::SQL".
"Data::Phrasebook::SQL" has knowledge of how DBI works and creates and executes your queries appropriately.
CONSTRUCTOR
new
Not to be accessed directly, but via the parent Data::Phrasebook, by specifying the class as SQL.
Additional arguments to those described in Data::Phrasebook::Generic are:
o "dbh" - a DBI database handle.
METHODS
dbh
Set, or get, the current DBI handle.
query
Constructs a Data::Phrasebook::SQL::Query object from a template. Takes at least one argument, this being the identifier for the query. The
identifier is used as a key into the phrasebook "file". A second argument can be provided, which is an optional hashref of key to value
mappings.
If phrasebook has a YAML source looking much like the following:
---
find_author:
sql: select class,title,author from books where author = :author
You could write:
my $q = $book->query( 'find_author' );
OR
my $q = $book->query( 'find_author', {
author => 'Lance Parkin'
} );
OR
my $author = 'Lance Parkin';
my $q = $book->query( 'find_author', {
author => $author,
} );
# sql = select class,title,author from books where author = ?
# args = 'Lance Parkin'
In the above examples, the parameters are bound to the SQL using the bind parameters functionality. This is more efficient in most cases
where the same SQL is reused with different values for fields.
However, not all SQL statements just need to bind parameters, some may require the ability to replace parameters, such as a field list.
---
find_author:
sql: select :fields from books where author = :author
my $q = $book->query( 'find_author',
replace => { fields => 'class,title,author' },
bind => { author => 'Lance Parkin' }
);
# sql = select class,title,author from books where author = ?
# args = 'Lance Parkin'
In all instances, if the SQL template requested does not exist or has no definition, then an error will be thrown.
Consult Data::Phrasebook::SQL::Query for what you can then do with your returned object.
For reference: the bind hashref argument, if it is given, is given to the query object's "order_args" and then "args" methods.
SEE ALSO
Data::Phrasebook, Data::Phrasebook::Generic, Data::Phrasebook::SQL::Query.
SUPPORT
Please see the README file.
AUTHOR
Original author: Iain Campbell Truskett (16.07.1979 - 29.12.2003)
Maintainer: Barbie <barbie@cpan.org> since January 2004.
for Miss Barbell Productions <http://www.missbarbell.co.uk>.
COPYRIGHT AND LICENSE
Copyright (C) 2003 Iain Truskett.
Copyright (C) 2004-2010 Barbie for Miss Barbell Productions.
This module is free software; you can redistribute it and/or
modify it under the Artistic Licence v2.
perl v5.10.1 2010-08-31 Data::Phrasebook::SQL(3pm)