r - Inserting a numeric value into a where statement -

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i got following code works pretty smooth:

 sql_cag <- sprintf("select * `cag_table` `comp_id` = 1");  df <- dbgetquery(con, sql_cag)

what replace 1 parameter. this: 

 sql_cag <- sprintf("select * `cag_table` `comp_id` ='%a'", competitie_id);  df <- dbgetquery(con, sql_cag)

with parameter competitie_id

 competitie_id <- 1  competitie_id <- as.numeric(competitie_id)

but returns empty dataframe. somehow seems go wrong '%a'. thoughts mights go wrong?


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