sql结果，数字作为列标题，如何使用PHP调用或更改用于数据透视的sql列标题

I have a pivot table that outputs the following result set:

as you can see column names are 0.9,1.2,1.5 etc etc

in my php, I cant reference the number

echo  $order->a;

I get error:Parse error: syntax error, unexpected T_DNUMBER, expecting T_STRING or T_VARIABLE

How can I correctly fetch this column or perhaps adjust the sql to have an alias? like a or b? like:

select * from t pivot ( avg(stock) for length in ([0.9] as a, [1.2] as b)) piv

Thanks as always,

If you want to alias your columns then you would have to use something like the following, where you place your alias in the final select list:

select section, 
  [0.9] as a,
  [1.2] as b
from t 
pivot 
( 
  avg(stock) 
  for length in ([0.9], [1.2])
) piv