where name =: ‘T’什么意思

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data exam;
  input name $ class $ score ;
  if name = ‘Tim’ or name = ‘Sally’;
  cards;
Tim math 9
Tim history 8  
Tim science 7
Sally math 10
Sally science 7
Sally history 10
John math 8
John history 8
John science 9
;
run;
：
data student4;
  set exam;
  where name =: ‘T’ or name contains ‘ally’;  
run;
等号后面冒号是什么忆昔？

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关键词：Where HERE name whe Science history science where

T开头吧，SAS help里如下解释
The colon causes SAS to compare the same number of characters in the shorter value and the longer value. In this case, the shorter string contains one character; therefore, SAS tests only the first character from the longer value. All names beginning with a T make the comparison true.