SAS proc SQL更新表，具有计数和最大值

Question

我想从左侧创建一个在右侧的表：

我首先使用以下代码创建了一个新表（工作！）：

proc sql;
    create table (table_right) as
        select distinct Customer format $15.
        from (table_left);
    select * from (table_right);
run;

proc sql;
    alter table (table_right)
        add Count_bin30 num label='Count_bin30' format=1000000.,
            Max_Date_Diff num label='Max_Date_Diff' format=1000000.;
    select Customer format=$15.,
           Count_bin30,
           Max_Date_Diff
    from (table_right);
run;

然后，当我尝试更新新添加的列时，我陷入了困境：

proc sql;
    update (table_right)
        set Count_bin30 = select count(Date_bin)
        from (table_left)
        where Date_bin='bin30';
run;

proc sql;
    update (table_right)
        set Max_Date_Diff = select max(Date_diff)
        from (table_left);
run;

任何解决方案都非常感谢！

Answer 1

不需要多个proc sql语句，您可以一次性实现结果。 另请注意， proc sql以quit结尾，而不是run 。

data table_left;
input customer $ date_diff date_bin $;
datalines;
James 0 0 
James 35 bin30
James 0 0
James 30 bin30
James 0 0
James 0 0
Daniel 0 0
Daniel 45 bin30
Daniel 61 bin60
Daniel 0 0
Ivy 0 0
Ivy 0 0
Ivy 0 0
Ivy 0 0
Ivy 108 bin90
Laura 0 0
Laura 0 0
;
run;

proc sql;
create table table_right
as select
customer,
sum(case when date_bin='bin30' then 1 else 0 end) as Count_bin30,
max(date_diff) as Max_Date_Diff
from table_left
group by customer
;
quit;