Variable to stay round and spoil calculation

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I have the following SELECT: 

SET @peso := 0;
SET @ganho := 0;

SELECT
    @peso := (SELECT SUM(peso)/1000 FROM entrada WHERE entrada_id = A.entrada_id)+@ganho AS peso,
    @peso,
    @ganho := (SELECT SUM(ganho)/1000 FROM entrada WHERE entrada_id = A.entrada_id) AS ganho,
    @ganho
FROM
    entrada AS A
WHERE
    A.entrada_id IN (18, 19,20, 21,22)
GROUP BY
    A.entrada_id

I start the "weight" and the "gain" with 0 and I have to apply the sum of the weight + gain for each line that is returning.

My problem is two:

  • The variable when I put in a column only shows the result as an integer and not as a decimal, I need the decimal pro calculation.

  • I think that since it's not returning the decimal, it's messing up the calculation.

    • Does anyone know why MYSQL rounds the variable in the column since the result is a decimal?

    Query Result Below: 

     peso           @peso  ganho        @ganho
 852.1890056    852    0.031025076  0
 852.1889198    852    1.714096448  1
 853.8719912    854    2.465015896  2
 854.6229106    856    2.83135176   2
        
    asked by anonymous 29.09.2017 / 19:21

    1 answer

    2

    Solution: 

    SET @in_weight = CAST(0 AS decimal(10,10));
SET @daily_gain := CAST(0 AS decimal(10,10)) ;
        
    29.09.2017 / 20:21
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