Nothing
Code
lf %>% distinct() %>% select(x)
Output
<SQL>
SELECT `x`
FROM (
SELECT DISTINCT `df`.*
FROM `df`
) AS `q01`
Code
lf %>% distinct() %>% rename(z = y)
Output
<SQL>
SELECT DISTINCT `x`, `y` AS `z`
FROM `df`
Code
lf %>% distinct() %>% relocate(y)
Output
<SQL>
SELECT DISTINCT `y`, `x`
FROM `df`
Code
out <- mf %>% select(a) %>% collect()
Message
Adding missing grouping variables: `b`
Code
(out <- left_join(lf1, lf2, by = "x") %>% select(b, x))
Output
<SQL>
SELECT `b`, `lf1`.`x` AS `x`
FROM `lf1`
LEFT JOIN `lf2`
ON (`lf1`.`x` = `lf2`.`x`)
Code
(out <- left_join(lf1, lf2, by = "x") %>% relocate(b))
Output
<SQL>
SELECT `b`, `lf1`.*
FROM `lf1`
LEFT JOIN `lf2`
ON (`lf1`.`x` = `lf2`.`x`)
Code
(out <- semi_join(lf1, lf2, by = "x") %>% select(x, a2 = a))
Output
<SQL>
SELECT `x`, `a` AS `a2`
FROM `lf1`
WHERE EXISTS (
SELECT 1 FROM `lf2`
WHERE (`lf1`.`x` = `lf2`.`x`)
)
Code
(out <- anti_join(lf1, lf2, by = "x") %>% relocate(a))
Output
<SQL>
SELECT `a`, `x`
FROM `lf1`
WHERE NOT EXISTS (
SELECT 1 FROM `lf2`
WHERE (`lf1`.`x` = `lf2`.`x`)
)
Code
print(lf)
Output
<SQL>
SELECT `x` AS `x2`, `y` AS `y3`, `z`
FROM `df` AS `df_LHS`
WHERE EXISTS (
SELECT 1 FROM `df` AS `df_RHS`
WHERE (`df_LHS`.`x` = `df_RHS`.`x`)
)
Code
print(lf2)
Output
<SQL>
SELECT `df_LHS`.`x` AS `x2`, `df_LHS`.`y` AS `y3`, `z`
FROM `df` AS `df_LHS`
LEFT JOIN `df` AS `df_RHS`
ON (`df_LHS`.`x` = `df_RHS`.`x`)
Code
lf %>% select(non_existent)
Condition
Error in `select()`:
! Can't select columns that don't exist.
x Column `non_existent` doesn't exist.
Code
lf %>% select(non_existent + 1)
Condition
Error in `select()`:
i In argument: `non_existent + 1`.
Caused by error:
! object 'non_existent' not found
Code
lf %>% relocate(non_existent)
Condition
Error in `relocate()`:
! Can't relocate columns that don't exist.
x Column `non_existent` doesn't exist.
Code
lf %>% relocate(non_existent + 1)
Condition
Error in `relocate()`:
i In argument: `non_existent + 1`.
Caused by error:
! object 'non_existent' not found
Code
lf %>% rename(x)
Condition
Error in `rename()`:
! All renaming inputs must be named.
Code
lf %>% rename(y = non_existent)
Condition
Error in `rename()`:
! Can't rename columns that don't exist.
x Column `non_existent` doesn't exist.
Code
lf %>% rename(y = non_existent + 1)
Condition
Error in `rename()`:
i In argument: `non_existent + 1`.
Caused by error:
! object 'non_existent' not found
Code
lf %>% rename_with(toupper, .cols = non_existent)
Condition
Error in `rename_with()`:
! Can't select columns that don't exist.
x Column `non_existent` doesn't exist.
Code
lf %>% rename_with(toupper, .cols = non_existent + 1)
Condition
Error in `rename_with()`:
i In argument: `non_existent + 1`.
Caused by error:
! object 'non_existent' not found
Code
lf %>% select(where(is.integer))
Condition
Error in `select()`:
! This tidyselect interface doesn't support predicates.
Code
lf %>% mutate(z = 1) %>% arrange(x, z) %>% select(x)
Condition
Warning:
ORDER BY is ignored in subqueries without LIMIT
i Do you need to move arrange() later in the pipeline or use window_order() instead?
Output
<SQL>
SELECT `x`
FROM (
SELECT `df`.*, 1.0 AS `z`
FROM `df`
) AS `q01`
Code
lf %>% select(2:1) %>% select(2:1)
Output
<SQL>
SELECT `df`.*
FROM `df`
Code
lf %>% select(2:1) %>% select(2:1) %>% select(2:1)
Output
<SQL>
SELECT `y`, `x`
FROM `df`
Code
lf %>% select(x1 = x) %>% select(x2 = x1)
Output
<SQL>
SELECT `x` AS `x2`
FROM `df`
Code
lf %>% mutate(a = 1, b = 2) %>% select(a)
Output
<SQL>
SELECT 1.0 AS `a`
FROM `df`
Code
lf %>% mutate(a = 1, b = 2) %>% select(x)
Output
<SQL>
SELECT `x`
FROM `df`
Code
show_query(out, sql_options = sql_options(cte = TRUE))
Output
<SQL>
[34mWITH[39m `q01` [34mAS[39m (
[34mSELECT[39m `x`, AVG(`y`) OVER (PARTITION BY `x`)[34m AS [39m`y`, `z` + 1.0[34m AS [39m`z`
[34mFROM[39m `df`
),
`q02` [34mAS[39m (
[34mSELECT[39m `q01`.*
[34mFROM[39m `q01`
[34mWHERE[39m (`z` = 1.0)
)
[34mSELECT[39m
`LHS`.`x`[34m AS [39m`x`,
`LHS`.`y`[34m AS [39m`y.x`,
`LHS`.`z`[34m AS [39m`z.x`,
`df`.`y`[34m AS [39m`y.y`,
`df`.`z`[34m AS [39m`z.y`
[34mFROM[39m `q02`[34m AS [39m`LHS`
[34mLEFT JOIN[39m `df`
[34mON[39m (`LHS`.`x` = `df`.`x`)
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