[R] SQL like function?

[Takatsugu Kobayashi]

Hi RUsers,

I am wonder if I can search observations whose IDs matches any of the 
values in another vector, such as in MySQL. While I am learing MySQL for 
future database management, I appreciate if anyone could give me a hint.

Suppose I have one 5*1 vector containing observation IDs and 
frequencies, and one 3*1 vector containing observation IDs.

observation<-c(1,2,3,4,5)
ID<-c(1,3,4)

Then, I would like to program a code that returns a results showing 
matched observations like

result: TRUE FALSE TRUE TRUE FALSE

I am reading S programming, but I cannot find a way to do this.

Thank you very much.

Taka