我有一个包含两列的表(代码:chararray,sp:double)
我想计算每个sp的百分比。
INPUT
t001 60
a002 75
a003 34
bb04 56
bbc5 23
cc2c 45
ddc5 45
期望的输出:
code Perc
t001 17%
a002 22%
a003 10%
bb04 16.5%
bbc5 6%
cc2c 13.3%
ddc5 13.3%
我试过这样但是输出没有到来。
A = load '....' as (code : chararray, sp : double);
B = GROUP A BY (code);
allcount = FOREACH B GENERATE SUM(A.speed) as total;
perc = FOREACH A GENERATE code,speed/(double)allcount.total * 100;
dump perc;
我如何使用猪拉丁?
答案 0 :(得分:0)
您正在将第二列加载到名为sp的字段中,但将其称为speed.I假设列由空格分隔,如果它是制表符,则在其中使用PigStorage('\ t') LOAD声明。
A = LOAD '/YourFilePath/YourFile.txt' USING PigStorage(' ') AS (code:chararray, sp:double);
B = GROUP A ALL;
C = FOREACH B GENERATE SUM(A.sp) AS total;
D = FOREACH A GENERATE code,ROUND_TO((sp/(double)C.total) * 100,2) AS perc;
E = FOREACH D GENERATE code,CONCAT((chararray)perc,'%');
DUMP E;
<强>输出:强>