Questions about join
Read more about join
python (65.1k questions)
javascript (44.2k questions)
reactjs (22.7k questions)
java (20.8k questions)
c# (17.4k questions)
html (16.3k questions)
r (13.7k questions)
android (12.9k questions)
mysql - how to join with dynamin column in table
I have three tables like the following:
calls_list (table)
id
line
rel_type
rel_id
1
3
user
2
2
10
lead
1
users (table)
id
name
phone
1
mehran
99999
2
reza
222222
leads (ta...
mehran_s_w
Votes: 0
Answers: 1
How does rsuffix and lsuffix work while joining multiple dataframes?
I have written the following code however I am unable to understand how to name the rsuffix and lsuffix parameters
dfs_list = []
for cycle in email_df.cycle_end_date.unique():
temp = email_df[emai...
coder_bg
Votes: 0
Answers: 1
How to merge dataframes on the next highest key value
I have df1:
a
2013
2014
2015
and df2
a
2014
2017
2018
2021
My goal would be that the key a from df1 merges onto the next highest key in df2 e.g. 2013->2014, 2014->2017 and 2015->2017. So ev...
Romero Azzalini
Votes: 0
Answers: 1
Sum up columns between two tables in MySQL
I have an application where students do three choices 1st, 2nd and 3rd from a list.
Table1 is the list they can choose from:
id
day
1
Monday
2
Thusday
3
Wednesday
Table2 is they fill i...
Björn Ljungström
Votes: 0
Answers: 2