backend_sql: SQL generation.

In sctyner/dplyr050: A Grammar of Data Manipulation

Description

These generics are used to run build various SQL queries. A default method generates ANSI 92 compliant SQL, but variations in SQL across databases means that it's likely that a backend will require at least a few methods.

Usage

sql_select(con, select, from, where = NULL, group_by = NULL,
  having = NULL, order_by = NULL, limit = NULL, distinct = FALSE, ...)

sql_subquery(con, from, name = random_table_name(), ...)

sql_join(con, x, y, type = "inner", by = NULL, ...)

sql_semi_join(con, x, y, anti = FALSE, by = NULL, ...)

sql_set_op(con, x, y, method)

sql_escape_string(con, x)

sql_escape_ident(con, x)

Arguments

con	A database connection.

Value

An SQL string.

sctyner/dplyr050 documentation built on May 17, 2019, 2:22 p.m.