Hi, I'm a new Stata user with a merge problem.
I have one data set (call it A) with a variable that needs to be defined in
terms of the observations in a second data set (B). I don't know if this can
be done with a single command or if it needs to be programmed. 
Basically, B is a lookup table. I need to lookup the contents of an A var in
B, and return the value of a different B var corresponding to the same data
point.
Thanks in advance for any suggestions.
Bayard
Example
A =
   type	
1 human	
2 cat	
3 human	
4 dog	
5 rat	
6 cat	
B =
   type		tail
1 human	0
2 cat		1
3 dog		1
4 rat		1
AFTER OPERATION
A =
   type		tail
1 human	0
2 cat		1
3 human	0
4 dog		1
5 rat		1
6 cat		1
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