Question

我使用SAS 9.4。

我有一个表名表，有两列：libname和memname，这是库名和表名，例如打击：

libname | memname
lib1    | table1
lib2    | table2

对于每条记录，我想验证列LIKE'％CLI％'是否具有字符串类型并且仅包含数字。每个表最多包含一个满足这些条件的列。

最后，我想将找到的列的名称作为新列添加到表名表中：

libname | memname | colname
lib1    | table1  | client
lib2    | table2  | cli_num

非常感谢您的帮助。

Answer 1

可以在不实际打开数据集的情况下检查存在性和类型。但是我们需要打开它们以检查值是否均为数字。这是您可以使用的循环构造，包括相关测试和示例数据。

/*  CLI exists, contains only digits*/
data ex1;
    input other $ CLI $;
    datalines;
x 1234
x 5787
;

/*  CLI exists, doesn't contains only digits*/
data ex2;
    input other $ CLI $;
    datalines;
x 123a
x 5787
;


/*  CLI exists, isn't character*/
data ex3;
    input other $ CLI;
    datalines;
x 1234
x 5787
;

/*  CLI doesn't exist*/
data ex4;
    input other $ other2;
    datalines;
x 1234
x 5787
;

/*  Makes a table of the datasets*/
data tableoftables;
    input libname $ memname $;
datalines;
work ex1
work ex2
work ex3
work ex4
;

%macro do_stuff(indata=);
/*  A data set to collect test results and present them to user.*/
data out;
    set &indata;
    length exists $3 type $9. alldigits $3.;
run;
/*  Put libname and data set names into macro variables*/
data _null_;
    set &indata;
    call symput(cat('libname', _n_), libname);
    call symput(cat('memname', _n_), memname);
run;

/*  Find the number of datasets to loop through*/
proc sql noprint;   
    select count(*)
    into :rows
    from &indata;

/*  Loop over data sets*/
%do i=1 %to &rows;
    /*If CLI was in a specific place, you could use varnum, like here: https://communities.sas.com/message/154973. To use like, it's easier to go through proc contents*/
    /*  Create data ser with variables*/
    proc contents noprint data=&&libname&i...&&memname&i  out=row&i;
    run;

    /*  Test 1: Is variable in file*/
    /*  Infile is initiated as 0, but turns to 1 if there is at least one variable like '%CLI%'. Type and name are collected*/
    %let infile=0;
    data test&i;
        set row&i;
        where name like '%CLI%';
        call symput('infile', 1);
        call symput('type', type);
        call symput('name', name);
    run;

    /*  Test 2: Is variable character*/
    %let typetext=-;
    %if &infile=1 %then %do;
        %if &type=2 %then %let typetext=Character;
        %else %if &type=1 %then %let typetext=Numeric;
    %end;

    /*  Test 3: Does variable only contain digits*/
    %let alldigits=-;
    data test3&i;
        set &&libname&i...&&memname&i end=eof;
        retain test;
        if _n_=1 then test=0;
        notdigit=notdigit(strip(&name));
        test+notdigit;
        if eof then do;
            if test=0 then call symput('alldigits', "YES");
            else call symput('alldigits', "NO");
        end;
    run;

    data out;
        set out;
        if _n_=&i then do;
            if &infile=1 then exists="YES";
            else exists="NO";
            type="&typetext";
            alldigits="&alldigits";
        end;
    run;

%end;

proc print data=out;
run;


%mend;
%do_stuff(indata=tableoftables)

在SAS中，验证表中列出的每个表中是否存在指定的列

1 个答案: