http://blog.sina.com.cn/s/blog_5d4a03250101hvst.html
转载程序:data ex;
a="hello";
output;
a="hi";
output;
run;
proc sql;
create table ex1 as
select a,ifn(a="hello",1,0) as a1,ifc(a="hello",'yes','no') as a2
from ex;
quit;
结果:
a a1 a2
hello 1 yes
hi 0 no
ifn(条件表达式,正确时输出的数值型赋值,错误时输出的数值型赋值,缺失时输出的数值型赋值)
ifc(条件表达式,正确时输出的字符型赋值,错误时输出的字符型赋值,缺失时输出的字符型赋值)