The difference between end number in the early row and the start number in the next
Hi Power User,
I'm trying to compute this kind of text file format:
file1:
jakarta 100 150
jakarta 170 210
beijing 220 250
beijing 260 280
beijing 290 320
new_york 330 350
new_york 370 420
tokyo 430 470
tokyo 480 485
seoul 490 540
seoul 570 590
seoul 640 680
seoul 730 750
singapur 780 830
singapur 860 940
. . .
. . .
. . .
p b e
The meaning of the dots that goes away until 'p', 'b', and 'e' are the marker that the flow those data still goes on until that point. The desired output is like this:
file2:
jakarta 170 150
beijing 260 250
beijing 290 280
new_york 370 350
tokyo 480 470
seoul 570 540
seoul 640 590
seoul 730 680
singapur 860 830
. . .
. . .
. . .
p b e
The explanation, the desired data is the difference between the end number in the town in the early row and the start number in the town in the next row. The numerical difference between different cities is not asked.
I have tried this following awk script:
But the result is like this:
# jakarta 170 210
# beijing 290 320
# new_york 370 420
# tokyo 430 470
# seoul 730 750
# singapur 860 940
. . .
. . .
. . .
p b e
The '#' sign is for marking the desired data. Do you have a solution for this problem? Thank you.
Hi
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...........
...........
..........
...........
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1:abc
3:ghi
6:pqr
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d jkl
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Discussion started by: tk2000
2 Replies
LEARN ABOUT DEBIAN
drop_table
DROP TABLE(7) SQL Commands DROP TABLE(7)NAME
DROP TABLE - remove a table
SYNOPSIS
DROP TABLE [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]
DESCRIPTION
DROP TABLE removes tables from the database. Only its owner can drop a table. To empty a table of rows without destroying the table, use
DELETE [delete(7)] or TRUNCATE [truncate(7)].
DROP TABLE always removes any indexes, rules, triggers, and constraints that exist for the target table. However, to drop a table that is
referenced by a view or a foreign-key constraint of another table, CASCADE must be specified. (CASCADE will remove a dependent view
entirely, but in the foreign-key case it will only remove the foreign-key constraint, not the other table entirely.)
PARAMETERS
IF EXISTS
Do not throw an error if the table does not exist. A notice is issued in this case.
name The name (optionally schema-qualified) of the table to drop.
CASCADE
Automatically drop objects that depend on the table (such as views).
RESTRICT
Refuse to drop the table if any objects depend on it. This is the default.
EXAMPLES
To destroy two tables, films and distributors:
DROP TABLE films, distributors;
COMPATIBILITY
This command conforms to the SQL standard, except that the standard only allows one table to be dropped per command, and apart from the IF
EXISTS option, which is a PostgreSQL extension.
SEE ALSO
ALTER TABLE [alter_table(7)], CREATE TABLE [create_table(7)]
SQL - Language Statements 2010-05-14 DROP TABLE(7)