hi how to do the following. If the input is
ACCOUNT= 400
QT = 65
CAPT =85
NT = 5
the output should be
ACCOUNT= 40
QT = 15
CAPT =37
NT = 90
I want the corresponding values to be changed to new values. hlp (1 Reply)
Hi,
I have a shell script that returns 10 records for the column Name and age from a select query. Where when i store those data in retrieve_list.txt file i need to store the data in a particular format like:-
$Jason$30
$Bill$23
$Roshan$25
Here is my script:
1)... (15 Replies)
Hi All,
I want to format the result driven from the query into neat format.
For example pls find the below code,
#! /bin/sh
result='
sqlplus -s uname/passwrd@DBname
select no,name,address,ph_no, passport_no,salary,designation
from emp_table where salary>1000;
exit
EOF'
... (8 Replies)
When I write
Select date_field from TableA fetch first row only
I am getting the output as 09/25/2009.
I want to get the output in the below format
2009-09-25 i.e., MM-DD-YYYY. Please help (7 Replies)
Good afternoon!
I have been lurking in this forum for awhile now. I have just recently started posting. I think this is a really good site. With that being said, I don't like to just run and get an answer before I try my best first.
I have poured some blood, sweat and tears into... (4 Replies)
Hi Folks,
I have written a perl script that reads data from excel sheet(.xls) using Spreadsheet::ParseExcel module. But the problem is this module doesn't work for excel sheets with extension .xlsx.
I have gone through Spreadsheet::XLSX module with which we can read from .xlsx file directly.... (1 Reply)
Hi
How do I translate
Let say
Cat inserts.sql
gives
Insert into PM9_TAXATION_ROUNDING
(STATE_GECODE, TAX_TYPE, TAX_AUTHORITY, SYS_CREATION_DATE, SYS_UPDATE_DATE, APPLICATION_ID, DL_SERVICE_CODE, ROUNDING_METHOD)
Values
('xx', 'xx', 'x', TO_DATE('10/26/2012 13:01:20',... (3 Replies)
Hi ,
I am purging two tables based on date.
In my script I am taking the count of the tables purging them and then taking the after counts. I need to mail the before and after counts of the two tables in a mail in table format as mentioned in the result section.
For Eg:
## Count of the... (14 Replies)
Hi Team ,
I am new to Sybase Adaptive Server Enterprise/15.7 (ASE) and need some guidance to find the different values in serial format column.
SELECT DISTINCT SERIAL_FORMAT FROM PRODUCTS
It has values with below format which contains 12 digits hexadecimal characters with... (2 Replies)
Hello,
In my shell script, I extract table data from HP Vertica DB into a csv file using vsql -c command. But the problem is the file getting created is in binary format and hence some of the data becomes unreadable which has chinese characters as part of data.
file -i filename.csv - gives... (2 Replies)
Discussion started by: Dharmatheja
2 Replies
LEARN ABOUT REDHAT
cluster
CLUSTER(7) SQL Commands CLUSTER(7)NAME
CLUSTER - cluster a table according to an index
SYNOPSIS
CLUSTER indexname ON tablename
INPUTS
indexname
The name of an index.
table The name (possibly schema-qualified) of a table.
OUTPUTS
CLUSTER
The clustering was done successfully.
DESCRIPTION
CLUSTER instructs PostgreSQL to cluster the table specified by table based on the index specified by indexname. The index must already have
been defined on tablename.
When a table is clustered, it is physically reordered based on the index information. Clustering is a one-time operation: when the table is
subsequently updated, the changes are not clustered. That is, no attempt is made to store new or updated tuples according to their index
order. If one wishes, one can periodically re-cluster by issuing the command again.
NOTES
In cases where you are accessing single rows randomly within a table, the actual order of the data in the heap table is unimportant. How-
ever, if you tend to access some data more than others, and there is an index that groups them together, you will benefit from using CLUS-
TER.
Another place where CLUSTER is helpful is in cases where you use an index to pull out several rows from a table. If you are requesting a
range of indexed values from a table, or a single indexed value that has multiple rows that match, CLUSTER will help because once the index
identifies the heap page for the first row that matches, all other rows that match are probably already on the same heap page, saving disk
accesses and speeding up the query.
During the cluster operation, a temporary copy of the table is created that contains the table data in the index order. Temporary copies of
each index on the table are created as well. Therefore, you need free space on disk at least equal to the sum of the table size and the
index sizes.
CLUSTER preserves GRANT, inheritance, index, foreign key, and other ancillary information about the table.
Because the optimizer records statistics about the ordering of tables, it is advisable to run ANALYZE on the newly clustered table. Other-
wise, the optimizer may make poor choices of query plans.
There is another way to cluster data. The CLUSTER command reorders the original table using the ordering of the index you specify. This can
be slow on large tables because the rows are fetched from the heap in index order, and if the heap table is unordered, the entries are on
random pages, so there is one disk page retrieved for every row moved. (PostgreSQL has a cache, but the majority of a big table will not
fit in the cache.) The other way to cluster a table is to use
SELECT columnlist INTO TABLE newtable
FROM table ORDER BY columnlist
which uses the PostgreSQL sorting code in the ORDER BY clause to create the desired order; this is usually much faster than an index scan
for unordered data. You then drop the old table, use ALTER TABLE...RENAME to rename newtable to the old name, and recreate the table's
indexes. However, this approach does not preserve OIDs, constraints, foreign key relationships, granted privileges, and other ancillary
properties of the table --- all such items must be manually recreated.
USAGE
Cluster the employees relation on the basis of its ID attribute:
CLUSTER emp_ind ON emp;
COMPATIBILITY
SQL92
There is no CLUSTER statement in SQL92.
SQL - Language Statements 2002-11-22 CLUSTER(7)