How to JOIN and MERGE Pandas DataFrame?

merge on index pandas

By Happy Hippopotamus on Jan 10, 2021

pd.merge(df1, df2, left_index=True, right_index=True)

Source: stackoverflow.com

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pd merge on multiple columns

By Hambo on Mar 26, 2020

new_df = pd.merge(A_df, B_df,  how='left', left_on=['A_c1','c2'], right_on = ['B_c1','c2'])

Source: stackoverflow.com

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pandas left join

By Comfortable Cockroach on Nov 26, 2020

df.merge(df2, left_on = "doc_id", right_on = "doc_num", how = "left")

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merge pandas

By Hilarious Hare on Mar 21, 2021

create table bricks (
  brick_id integer,
  colour   varchar2(10)
);

create table colours (
  colour_name           varchar2(10),
  minimum_bricks_needed integer
);

insert into colours values ( 'blue', 2 );
insert into colours values ( 'green', 3 );
insert into colours values ( 'red', 2 );
insert into colours values ( 'orange', 1);
insert into colours values ( 'yellow', 1 );
insert into colours values ( 'purple', 1 );

insert into bricks values ( 1, 'blue' );
insert into bricks values ( 2, 'blue' );
insert into bricks values ( 3, 'blue' );
insert into bricks values ( 4, 'green' );
insert into bricks values ( 5, 'green' );
insert into bricks values ( 6, 'red' );
insert into bricks values ( 7, 'red' );
insert into bricks values ( 8, 'red' );
insert into bricks values ( 9, null );

commit;

Source: livesql.oracle.com

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merge pandas

By Hilarious Hare on Mar 21, 2021

select * from bricks, colours;

Source: livesql.oracle.com

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merge pandas

By Hilarious Hare on Mar 21, 2021

select * from bricks;

select * from colours;

Source: livesql.oracle.com

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