如何计算 SQL 中的胜率？

Question

I am trying to calculate win rate for the below table in SQL but not getting a correct answer

What I am looking for is WON = 1111/1496*100

So far i've got

SELECT Sum( Status = 'Won') /(Select Count(Status))*100 as Win_rate
FROM table

If i run the above it gives me 0 .

Answer 1

Your problem is integer division. Both operands of the division are integers, so SQLite forces an integer result. A typical workaround is force decimal context, like:

SELECT 100.0 * sum(Status = 'Won') / Count(*) as Win_rate FROM mytable

But it is simpler to use avg() here:

SELECT avg(Status = 'Won') * 100 as Win_rate
FROM mytable