1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
# print method doesn't change unexpectedly
Code
left_join(lf1, lf2, by = "x") %>% left_join(lf3, by = "x") %>% sql_build()
Output
<SQL JOINS>
X:
<IDENT> lf1
Type: left
By:
x-x
Y:
<IDENT> lf2
Type: left
By:
x-x
Y:
<IDENT> lf3
# generated sql doesn't change unexpectedly
Code
inner_join(lf, lf)
Message
Joining, by = c("x", "y")
Output
<SQL>
SELECT `df_LHS`.*
FROM `df` AS `df_LHS`
INNER JOIN `df` AS `df_RHS`
ON (`df_LHS`.`x` = `df_RHS`.`x` AND `df_LHS`.`y` = `df_RHS`.`y`)
---
Code
left_join(lf, lf)
Message
Joining, by = c("x", "y")
Output
<SQL>
SELECT `df_LHS`.*
FROM `df` AS `df_LHS`
LEFT JOIN `df` AS `df_RHS`
ON (`df_LHS`.`x` = `df_RHS`.`x` AND `df_LHS`.`y` = `df_RHS`.`y`)
---
Code
right_join(lf, lf)
Message
Joining, by = c("x", "y")
Output
<SQL>
SELECT `df_RHS`.*
FROM `df` AS `df_LHS`
RIGHT JOIN `df` AS `df_RHS`
ON (`df_LHS`.`x` = `df_RHS`.`x` AND `df_LHS`.`y` = `df_RHS`.`y`)
---
Code
full_join(lf, lf)
Message
Joining, by = c("x", "y")
Output
<SQL>
SELECT
COALESCE(`df_LHS`.`x`, `df_RHS`.`x`) AS `x`,
COALESCE(`df_LHS`.`y`, `df_RHS`.`y`) AS `y`
FROM `df` AS `df_LHS`
FULL JOIN `df` AS `df_RHS`
ON (`df_LHS`.`x` = `df_RHS`.`x` AND `df_LHS`.`y` = `df_RHS`.`y`)
# only disambiguates shared variables
Code
left_join(lf1, lf2)
Message
Joining, by = "x"
Output
<SQL>
SELECT `df_LHS`.*, `z`
FROM `df` AS `df_LHS`
LEFT JOIN `df` AS `df_RHS`
ON (`df_LHS`.`x` = `df_RHS`.`x`)
---
Code
left_join(lf1, lf2, by = c(y = "z"))
Output
<SQL>
SELECT `df_LHS`.`x` AS `x.x`, `y`, `df_RHS`.`x` AS `x.y`
FROM `df` AS `df_LHS`
LEFT JOIN `df` AS `df_RHS`
ON (`df_LHS`.`y` = `df_RHS`.`z`)
# disambiguate variables that only differ in case
Code
left_join(lf1, lf2, by = "y")
Output
<SQL>
SELECT `df_LHS`.*, `df_RHS`.`X` AS `X`
FROM `df` AS `df_LHS`
LEFT JOIN `df` AS `df_RHS`
ON (`df_LHS`.`y` = `df_RHS`.`y`)
# sql_on query doesn't change unexpectedly
Code
inner_join(lf1, lf2, sql_on = "LHS.y < RHS.z")
Output
<SQL>
SELECT `LHS`.`x` AS `x.x`, `y`, `RHS`.`x` AS `x.y`, `z`
FROM `df` AS `LHS`
INNER JOIN `df` AS `RHS`
ON (LHS.y < RHS.z)
---
Code
left_join(lf1, lf2, sql_on = "LHS.y < RHS.z")
Output
<SQL>
SELECT `LHS`.`x` AS `x.x`, `y`, `RHS`.`x` AS `x.y`, `z`
FROM `df` AS `LHS`
LEFT JOIN `df` AS `RHS`
ON (LHS.y < RHS.z)
---
Code
right_join(lf1, lf2, sql_on = "LHS.y < RHS.z")
Output
<SQL>
SELECT `LHS`.`x` AS `x.x`, `y`, `RHS`.`x` AS `x.y`, `z`
FROM `df` AS `LHS`
RIGHT JOIN `df` AS `RHS`
ON (LHS.y < RHS.z)
---
Code
full_join(lf1, lf2, sql_on = "LHS.y < RHS.z")
Output
<SQL>
SELECT `LHS`.`x` AS `x.x`, `y`, `RHS`.`x` AS `x.y`, `z`
FROM `df` AS `LHS`
FULL JOIN `df` AS `RHS`
ON (LHS.y < RHS.z)
---
Code
semi_join(lf1, lf2, sql_on = "LHS.y < RHS.z")
Output
<SQL>
SELECT *
FROM `df` AS `LHS`
WHERE EXISTS (
SELECT 1 FROM `df` AS `RHS`
WHERE (LHS.y < RHS.z)
)
---
Code
anti_join(lf1, lf2, sql_on = "LHS.y < RHS.z")
Output
<SQL>
SELECT *
FROM `df` AS `LHS`
WHERE NOT EXISTS (
SELECT 1 FROM `df` AS `RHS`
WHERE (LHS.y < RHS.z)
)
|
