Proc SQL 可以使选择的 INTO 宏变量的值被宏引用吗？

Question

考虑此示例，其中所选值具有影响分辨率的特殊宏字符 & 和 %。 %superq()用于屏蔽字符。

data have;
  id=1; s='A&B %now';

proc sql noprint;
  select s into :myvar from have where id=1;

%put &=myvar;
%put &myvar;

%let myvar = %superq(myvar);  /* macro quote the special symbols & and % */

%put &=myvar;

------------------- LOG -------------------
53   proc sql noprint;
54     select s into :myvar from have where id=1;
55
56   %put &=myvar;
WARNING: Apparent symbolic reference B not resolved.
WARNING: Apparent invocation of macro NOW not resolved.
MYVAR=A&B %now
57   %put &myvar;
WARNING: Apparent symbolic reference B not resolved.
WARNING: Apparent invocation of macro NOW not resolved.
A&B %now
58
59   %let myvar = %superq(myvar);  /* macro quote the special symbols & and % */
60
61   %put &=myvar;
MYVAR=A&B %now

是否有 SELECT <expression> INTO :<symbol> 语法，其中所选值被强制宏引用？

Answer 1

没有

在 SELECT 之后添加一个 %LET 语句。

proc sql noprint;
  select s into :myvar from have where id=1;
%let myvar=%superq(myvar);

或添加实际引号字符。

proc sql noprint;
  select quote(trim(s),"'") into :myvar from have where id=1;

Proc SQL 可以使选择的 INTO 宏变量的值被宏引用吗？

Can Proc SQL cause the value selected INTO a macro variable to be macro quoted?

sas