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Update relational-data.Rmd (#261) 

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S'busiso Mkhondwane 2016-08-15 14:31:59 +02:00 committed by Hadley Wickham
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@ -472,7 +472,7 @@ The inverse of a semi-join is an anti-join. An anti-join keeps the rows that _do
knitr::include_graphics("diagrams/join-anti.png")
```
Anti-joins are are useful for diagnosing join mismatches. For example, when connecting `flights` and `planes`, you might be interested to know that there are many `flights` that don't have a match in `planes`:
Anti-joins are useful for diagnosing join mismatches. For example, when connecting `flights` and `planes`, you might be interested to know that there are many `flights` that don't have a match in `planes`:
```{r}
flights %>%