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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.