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comparing files line by line

Thu, 03/26/2009 - 22:48 — sandip

Here's a way to compare two files that have common lines in both files:

sort file1.txt > file1_sorted.txt
sort file2.txt > file2_sorted.txt
comm -12 file1_sorted.txt file2_sorted.txt

Note: files need to be sorted first prior to comparing.

Sorting VARCHAR data in mysql

Thu, 01/26/2006 - 11:10 — sandip

Here's a quick tip at sorting VARCHAR type data in mysql database with values in a column.

With the default sort, it would look something like below:

mysql> SELECT column FROM table_name ORDER BY column; 

column
======
100
1000
10000
200
2000
20000
...

Now with "... ORDER BY column+0", I get it sorted right:

mysql> SELECT column FROM table_name ORDER BY column+0; 

column
======
100
200
1000
2000
10000
20000
...

This is a quick fix instead of sorting to CAST operator.

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