Question

data numbers;
  input num;
  datalines;
  3
  1
  3
  ;
run;

%macro temp(num);
  proc sql noprint;
    select count(*) into :count from numbers;
  quit;
  %if (&num eq &count) %then 
    %put Match Found;
  %else 
    %put No Match Found;
  %symdel count;
%mend;

data _NULL_;
  set numbers;
  call execute('%temp('||num||')');
run;

为什么此代码显示错误，尽管一切正确。我正在检查数据集编号中的值以查找之间的匹配带有可变数字的整体计数（仅适用于练习）在检查条件I之后，我使用proc SQL进行了计数我正在删除count宏变量。后执行为什么SAS提供错误消息。请解释一下真的发生在这段代码中。

LOG-----when I execute the last data step--------->

    6188   data _NULL_;
    6189   set numbers;
    6190   call execute('%temp('||num||')');
    6191   run;

    NOTE: Numeric values have been converted to character values at the places given by:
                (Line):(Column).
                6190:24
    Match Found
    WARNING: Apparent symbolic reference COUNT not resolved.
    ERROR: A character operand was found in the %EVAL function or %IF condition where a numeric
                 operand is required. The condition was: &num eq &count
    ERROR: The macro TEMP will stop executing.
    WARNING: Apparent symbolic reference COUNT not resolved.
    ERROR: A character operand was found in the %EVAL function or %IF condition where a numeric
                 operand is required. The condition was: &num eq &count
    ERROR: The macro TEMP will stop executing.
    NOTE: The SAS System stopped processing this step because of errors.
    NOTE: There were 3 observations read from the data set WORK.NUMBERS.
    NOTE: DATA statement used (Total process time):
                real time           0.00 seconds
                cpu time            0.00 seconds


    NOTE: CALL EXECUTE generated line.
    1     + proc sql;
    1     +           select count(*) into :count from numbers;
    1     +                                                     quit;
    NOTE: PROCEDURE SQL used (Total process time):
                real time           0.09 seconds
                cpu time            0.00 seconds


    2     + proc sql;
    2     +           select count(*) into :count from numbers;
    2     +                                                     quit;
    NOTE: PROCEDURE SQL used (Total process time):
                real time           0.15 seconds
                cpu time            0.01 seconds


    3     + proc sql;
    3     +           select count(*) into :count from numbers;
    3     +                                                     quit;
    NOTE: PROCEDURE SQL used (Total process time):
                real time           0.15 seconds
                cpu time            0.01 seconds

Answer 1

当CALL EXECUTE（）语句运行时，代码被压入堆栈。由于您没有使用任何宏引用，因此宏实际上正在运行，并且生成的代码被压入堆栈。因此％IF语句在SELECT语句运行之前运行。您可以使用％NRSTR（）来延迟此操作，以便将宏调用推送到堆栈。

call execute(cats('%nrstr(%temp)(',num,')'));

或者只是避免CALL EXECUTE并使用PUT语句将代码写入您可以％INCLUDE的文件。

filename code temp;
data _null_;
  set numbers;
  file code ;
  put '%temp(' num ')' ;
run;
%include code / source2 ;

Answer 2

从documentation page引用来执行调用：

注意：因为宏引用立即执行并且SAS 语句在步骤边界之后才执行，不能使用 CALL EXECUTE以调用包含宏引用的宏由CALL SYMPUT在该宏中创建的变量。

我认为你在这里尝试做的事情基本上是同样的事情，只在你的宏中使用proc sql的{{1}}而不是select into。

解决此限制的一种方法是使用call symput功能。您可以使用它来创建一个函数式宏，然后可以通过dosubl生成的%put语句运行：

call execute

或者，您可以将data numbers; input num; datalines; 3 1 3 ; run; %symdel COUNT; %macro temp(num); %sysfunc(dosubl(proc sql noprint; select count(*) into :count from numbers; quit;)) %if &num eq &count %then %put Match Found; %else %put No Match Found; %mend; data _NULL_; set numbers; count = symget('Count'); put "Before call execute " _n_= count=; call execute('%put rc=%temp('||num||');'); count = symget('Count'); put "After call execute " _n_= count=; run;调用放入数据步骤而不是宏定义：

dosubl

调用执行不在SAS中工作

2 个答案: