Subset distinct/unique rows

This is a method for the dplyr distinct() generic. It adds the DISTINCT clause to the SQL query.

# S3 method for tbl_lazy
distinct(.data, ..., .keep_all = FALSE)

Arguments

.data	A lazy data frame backed by a database query.
...	<data-masking> Variables, or functions or variables. Use desc() to sort a variable in descending order.
.keep_all	If TRUE, keep all variables in .data. If a combination of ... is not distinct, this keeps the first row of values.

Value

Another tbl_lazy. Use show_query() to see the generated query, and use collect() to execute the query and return data to R.

Examples

library(dplyr, warn.conflicts = FALSE)

db <- memdb_frame(x = c(1, 1, 2, 2), y = c(1, 2, 1, 1))
db %>% distinct() %>% show_query()
#> <SQL>
#> SELECT DISTINCT *
#> FROM `dbplyr_012`
db %>% distinct(x) %>% show_query()
#> <SQL>
#> SELECT DISTINCT `x`
#> FROM `dbplyr_012`