像 Excel 的“VLOOKUP"一样工作的 SAS 代码；功能 [英] SAS Code that works like Excel's "VLOOKUP" function

问题描述

我正在寻找与 Excel 中的VLOOKUP"函数类似的 SAS 代码.

I'm looking for a SAS Code that works just like "VLOOKUP" function in Excel.

我有两张桌子:table_1 有一个 ID 列，其中包含 10 行的其他一些列.Table_2 有两列:ID 和定义，共 50 行.我想在 table_1 中定义一个新变量Definition"并从 table_2 中查找 ID 值.

I have two tables: table_1 has an ID column with some other columns in it with 10 rows. Table_2 has two columns: ID and Definition with 50 rows. I want to define a new variable "Definition " in table_1 and lookup the ID values from table_2.

除了合并之外，我还没有真正尝试过任何其他方法.但是合并保留了 table_2 中所有额外的 40 个变量，这不是我喜欢的.

I haven't really tried anything other than merge. but merge keeps all the extra 40 variables from table_2 and that's not what I like.

谢谢，SE

推荐答案

最简单的方法是在 merge 语句中使用 keep 选项.

The simplest way is to use the keep option on your merge statement.

data result;
    merge table_1 (in=a) table_2 (in=b keep=id definition);
    by id;
    if a;
 run;

另一种意味着您不必对数据集进行排序的方法是使用 proc sql.

An alternative that means you don't have to sort your datasets is to use proc sql.

proc sql;
    create table result as
    select a.*,
           b.definition
    from table_1 a
    left join table_2 b on a.id = b.id;
quit;

最后，如果 table_2 很小，还有哈希表选项:

Finally, there is the hash table option if table_2 is small:

data result;
    if _n_ = 1 then do;
        declare hash b(dataset:'table_2');
        b.definekey('id');
        b.definedata('definition');
        b.definedone();
        call missing(definition);
    end;
    set table_1;
    b.find();
run;

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