What is difference between single quotation marks and double quotation marks?
Single quotes prevent the resolution of macro triggers (& and %) in the enclosed text.
Exception: when single quotes are embedded within double quotes:
%let test=xxx;
data test;
test1 = "'&test'";
run;
Also the use of single quotes around a character literal also allows placing a single (or odd number of) double quote into the value such as the use of " for inch measurements: '5.3"' <= that is " followed with ' and vice versa "John's car". While possible to do with just one quote style the alternate 'John''s car' <= the '' is two single quotes, isn't quite as obvious in some situations and can be difficult to deal with for multiple single quotes needed within a single string.
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