rating system update - overlaps

[kdjuiopo]

I might be a newb for asking this or i'm just overthinking

i have a rating system wheere when someboy rates it grabs the number from the db, do the math and then update the number in the row

if two people happen to click rate at the same time.. wouldn't that cause problems or chances of that happen is like winning the lottary

[rajmv]

Depends on how many hits that button gets..
If it's more than 1 time every 2 seconds, then your risk of missed counts increases.

The "right" way to solve this is with a "sql transaction".