I have a '|' delimited file and want to remove all the records from the file if the date is greater than a year from sysdate. The layout of the file is as below -
xxxxxxxxxxxxxx|yyyyyy|zzzzzz|2009-12-27-00:00| 000000000|N
xxxxxxxxxxxxxx|yyyyyy|zzzzzz|2010-01-03-00:00| 000000000|N... (4 Replies)
Hi,
I am not sure if this has already been asked (I tried the search but the search was too broad). Basically I want to remove rows based on another file.
So file1 looks like this (tab seperated):
HHN 3 5 5
HUJ 2 2 1
JJJ 3 1 1
JUN 2 1 3
I have another file (file2)... (2 Replies)
Sorry I made a mistake in my last post (output is suppose to be the opposite). Here is a revised post.
Hi,
I am not sure if this has already been asked (I tried the search but the search was too broad). Basically I want to remove rows based on another file.
So file1 looks like this (tab... (3 Replies)
Hi I need a way of removing rows from a txt file that are older than 30 days from today, going by the date in column 2, below is an example from my file. I have tried awk but don't have enough knowledge. I would really appreciate some help.
41982,15/07/2010,H833AB/0,JZ,288... (6 Replies)
Dear community,
maybe I'm asking the moon :rolleyes:, but I'm scratching my head to find a solution for it. :wall:
I have a file called query.out (coming from Oracle query), the file is like this:
ADDR TOTAL
-------------------- ----------
TGROUPAGGR... (16 Replies)
Hello Everyone,
I am trying to find a way to take a .csv file with 7 columns and a ton of rows (over 600,000) and remove the entire row if the cell in forth column is blank.
Just to give you a little background on why I am doing this (just in case there is an easier way), I am pulling... (3 Replies)
Hello,
I am trying to eliminate rows where the first field is duplicated, leaving the row where the last field is "NET".
Data file:
345234|22.34|LST
546543|55.33|LST
793929|98.23|LST
793929|64.69|NET
149593|49.22|LST
Desired output:
345234|22.34|LST
546543|55.33|LST... (2 Replies)
Background:
I have a file of thousands of potential SSR primers from Batch Primer 3.
I can't use primers that will contain the same sequence ID or sequence as another primer.
I have some basic shell scripting skills, but not enough to handle this.
What you need to know:
I need to remove the... (1 Reply)
Hi,
I have a requirement where I need to delete given number of top and bottom rows in a flat file which has new line as its delimiter.
For ex: if top_rows=2 & bottom_rows=1
Then in a given file which looks like:
New York
DC
LA
London
Tokyo
Prague
Paris
Bombay
Sydney... (7 Replies)
Discussion started by: calredd
7 Replies
LEARN ABOUT SUSE
delete
DELETE(7) SQL Commands DELETE(7)NAME
DELETE - delete rows of a table
SYNOPSIS
DELETE FROM [ ONLY ] table [ [ AS ] alias ]
[ USING usinglist ]
[ WHERE condition | WHERE CURRENT OF cursor_name ]
[ RETURNING * | output_expression [ [ AS ] output_name ] [, ...] ]
DESCRIPTION
DELETE deletes rows that satisfy the WHERE clause from the specified table. If the WHERE clause is absent, the effect is to delete all rows
in the table. The result is a valid, but empty table.
Tip: TRUNCATE [truncate(7)] is a PostgreSQL extension that provides a faster mechanism to remove all rows from a table.
By default, DELETE will delete rows in the specified table and all its child tables. If you wish to delete only from the specific table
mentioned, you must use the ONLY clause.
There are two ways to delete rows in a table using information contained in other tables in the database: using sub-selects, or specifying
additional tables in the USING clause. Which technique is more appropriate depends on the specific circumstances.
The optional RETURNING clause causes DELETE to compute and return value(s) based on each row actually deleted. Any expression using the
table's columns, and/or columns of other tables mentioned in USING, can be computed. The syntax of the RETURNING list is identical to that
of the output list of SELECT.
You must have the DELETE privilege on the table to delete from it, as well as the SELECT privilege for any table in the USING clause or
whose values are read in the condition.
PARAMETERS
ONLY If specified, delete rows from the named table only. When not specified, any tables inheriting from the named table are also pro-
cessed.
table The name (optionally schema-qualified) of an existing table.
alias A substitute name for the target table. When an alias is provided, it completely hides the actual name of the table. For example,
given DELETE FROM foo AS f, the remainder of the DELETE statement must refer to this table as f not foo.
usinglist
A list of table expressions, allowing columns from other tables to appear in the WHERE condition. This is similar to the list of
tables that can be specified in the FROM Clause [select(7)] of a SELECT statement; for example, an alias for the table name can be
specified. Do not repeat the target table in the usinglist, unless you wish to set up a self-join.
condition
An expression that returns a value of type boolean. Only rows for which this expression returns true will be deleted.
cursor_name
The name of the cursor to use in a WHERE CURRENT OF condition. The row to be deleted is the one most recently fetched from this cur-
sor. The cursor must be a non-grouping query on the DELETE's target table. Note that WHERE CURRENT OF cannot be specified together
with a Boolean condition. See DECLARE [declare(7)] for more information about using cursors with WHERE CURRENT OF.
output_expression
An expression to be computed and returned by the DELETE command after each row is deleted. The expression can use any column names
of the table or table(s) listed in USING. Write * to return all columns.
output_name
A name to use for a returned column.
OUTPUTS
On successful completion, a DELETE command returns a command tag of the form
DELETE count
The count is the number of rows deleted. If count is 0, no rows matched the condition (this is not considered an error).
If the DELETE command contains a RETURNING clause, the result will be similar to that of a SELECT statement containing the columns and val-
ues defined in the RETURNING list, computed over the row(s) deleted by the command.
NOTES
PostgreSQL lets you reference columns of other tables in the WHERE condition by specifying the other tables in the USING clause. For exam-
ple, to delete all films produced by a given producer, one can do:
DELETE FROM films USING producers
WHERE producer_id = producers.id AND producers.name = 'foo';
What is essentially happening here is a join between films and producers, with all successfully joined films rows being marked for dele-
tion. This syntax is not standard. A more standard way to do it is:
DELETE FROM films
WHERE producer_id IN (SELECT id FROM producers WHERE name = 'foo');
In some cases the join style is easier to write or faster to execute than the sub-select style.
EXAMPLES
Delete all films but musicals:
DELETE FROM films WHERE kind <> 'Musical';
Clear the table films:
DELETE FROM films;
Delete completed tasks, returning full details of the deleted rows:
DELETE FROM tasks WHERE status = 'DONE' RETURNING *;
Delete the row of tasks on which the cursor c_tasks is currently positioned:
DELETE FROM tasks WHERE CURRENT OF c_tasks;
COMPATIBILITY
This command conforms to the SQL standard, except that the USING and RETURNING clauses are PostgreSQL extensions.
SQL - Language Statements 2010-05-14 DELETE(7)