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Top Forums UNIX for Advanced & Expert Users How to remove a char before a pattern? Post 302991992 by raju2016 on Monday 20th of February 2017 12:27:16 PM
Old 02-20-2017
How to remove a char before a pattern?

Hi I have a file where i want to remove a char before a specific pattern.
exp:
Code:
CREATE TABLE
 (
 A,
 B,
 C,      ----comma needs to be removed
 )AS SELECT
 A,
 B,
 C,      ----comma needs to be removed
 FROM  TABLE.

So i want to delete the comma(,) after the C both ways.Pattern can be look for ")AS SELECT" and "FROM" .So before this pattern i want to delete a single char which is comma.
my output should:

Code:
CREATE TABLE
 (
 A,
 B,
 C      -----removed comma
 )AS SELECT
 A,
 B,
 C      -----removed comma
 FROM  TABLE.


Moderator's Comments:
Mod Comment Please use CODE tags as required by forum rules!

Last edited by RudiC; 02-20-2017 at 02:48 PM.. Reason: Added/Changed CODE tags.
 

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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)
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