AWK Optimization

Input (MySQL status):

| Com_select                 | 16653146213   |
| Com_delete                 | 43654772        |
| Com_insert                  | 637410971      |
| Com_update                | 673829655      |

Output:
Read Query #
Write Query #

Below script works, but I think there must be a concise AWK one.

#!/bin/sh

declare -i m n i j

m=`awk '$2 == "Com_select" {print $4}' /var/log/mysql/status1`
n=`awk '$2 == "Com_select" {print $4}' /var/log/mysql/status2`

i=`awk '$2 == "Com_delete" || $2 == "Com_insert" || $2 ==
"Com_update" {sum += $4} END {print sum}' /var/log/mysql/status1`
j=`awk '$2 == "Com_delete" || $2 == "Com_insert" || $2 ==
"Com_update" {sum += $4} END {print sum}' /var/log/mysql/status2`

awk -v Read1=$m -v Read2=$n 'BEGIN { printf( "%.4f\n", (Read2 - Read1)/
300 ) }'
awk -v Write1=$i -v Write2=$j 'BEGIN { printf( "%.4f\n", (Write2 -
Write1)/300 ) }'