compare two dataframes and display the data that are different

Question

i have two dataframes and i want to compare the values of two columns and display those who are different, for exemple: compare this Table 1

A	B	C	D
O1	2	E1	2
O1	3	E1	1
O1	2	E1	0
O1	5	E2	2
O1	2	E2	3
O1	2	E2	2
O1	5	E2	1
O2	8	E1	2
O2	8	E1	0
O2	0	E1	1
O2	2	E1	4
O2	9	E1	2
O2	2	E2	1
O2	9	E2	4
O2	2	E2	2

with this table 2

A	B	C	D
O1	2	E1	2
O1	2	E2	3
O2	2	E1	4
O2	9	E2	4

i tried

cond= [table1.A ==  table2.A, table1.C ==  table2.C, table1.D ==  table2.D]
join = table1.join(table2,cond,"leftsemi")

and since i have a lot of data in it, i don't know how to check if the result i've got is correct

Answer 1

Since your dataframes has the same schema, you can use subtract

df1

df1 = spark.createDataFrame([
    (1, 2, 3, 4),
    (5, 6, 7, 8),
], ['a', 'b', 'c', 'd'])

+---+---+---+---+
|  a|  b|  c|  d|
+---+---+---+---+
|  1|  2|  3|  4|
|  5|  6|  7|  8|
+---+---+---+---+

df2

df2 = spark.createDataFrame([
    (5, 6, 7, 8),
], ['a', 'b', 'c', 'd'])

+---+---+---+---+
|  a|  b|  c|  d|
+---+---+---+---+
|  5|  6|  7|  8|
+---+---+---+---+

subtract to get data that exists in df1 but does not exists in df2

df1.subtract(df2).show()

+---+---+---+---+
|  a|  b|  c|  d|
+---+---+---+---+
|  1|  2|  3|  4|
+---+---+---+---+