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Full Discussion: Selective delete in SQL
Top Forums UNIX for Dummies Questions & Answers Selective delete in SQL Post 302772485 by sonia102 on Tuesday 26th of February 2013 07:59:49 PM
Old 02-26-2013
I used :
"delete from tablename
where seq_id = 'seq2'
i deleted all the other sequences.

and after that
delete from tablename
where stop_id>=1000000 ;

i dont know how to reduce the original file size
its 300mb and i want to retain the first 100mb .

could some1 suggest?

---------- Post updated 02-26-13 at 07:59 PM ---------- Previous update was 02-25-13 at 09:54 PM ----------

hi
is there any command to count the number of bits in a file ?

Anything that i can use to retain the first 1000 or 100mb bits in a file and delte the remaining?

Last edited by sonia102; 02-26-2013 at 03:38 AM..
 

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TRUNCATE(1)							   User Commands						       TRUNCATE(1)

NAME
truncate - shrink or extend the size of a file to the specified size SYNOPSIS
truncate OPTION... FILE... DESCRIPTION
Shrink or extend the size of each FILE to the specified size A FILE argument that does not exist is created. If a FILE is larger than the specified size, the extra data is lost. If a FILE is shorter, it is extended and the extended part (hole) reads as zero bytes. Mandatory arguments to long options are mandatory for short options too. -c, --no-create do not create any files -o, --io-blocks treat SIZE as number of IO blocks instead of bytes -r, --reference=RFILE base size on RFILE -s, --size=SIZE set or adjust the file size by SIZE bytes --help display this help and exit --version output version information and exit The SIZE argument is an integer and optional unit (example: 10K is 10*1024). Units are K,M,G,T,P,E,Z,Y (powers of 1024) or KB,MB,... (pow- ers of 1000). SIZE may also be prefixed by one of the following modifying characters: '+' extend by, '-' reduce by, '<' at most, '>' at least, '/' round down to multiple of, '%' round up to multiple of. AUTHOR
Written by Padraig Brady. REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report truncate translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
dd(1), truncate(2), ftruncate(2) Full documentation at: <http://www.gnu.org/software/coreutils/truncate> or available locally via: info '(coreutils) truncate invocation' GNU coreutils 8.28 January 2018 TRUNCATE(1)
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