How To Split Comma Delimited Values Into Multiple Rows Using Python
I'm using Python and SQLite to manipulate a database. I have an SQLite Table Movies that looks like this: | ID | Country +----------------+------------- | 1
Solution 1:
Using Python,
cursor.execute("""Select * from Movies""")
all_data = cursor.fetchall()
cursor.execute("""CREATE TABLE IF NOT EXISTS Countries
(ID TEXT,
Country TEXT)""")
for single_data in all_data:
countries = single_data[1].split()
for single_country in countries:
cursor.execute("""INSERT INTO Countries VALUES(%s,"%s")"""%(single_data[0],single_country))
conn.commit()
Solution 2:
You can solve this in pure SQLite using a common table expression.
createtable movies(id integerprimary key, country text);
insertinto movies values
(1,'USA, Germany, Mexico'), (2,'Brazil, Canada'), (3,'Peru');
createtable countries(id integer, country text);
insertinto countries
WITH split(id, country, str) AS (
SELECT id, '', country||','FROM movies
UNIONALLSELECT id,
trim(substr(str, 0, instr(str, ','))),
substr(str, instr(str, ',')+1)
FROM split WHERE str!=''
) SELECT id, country FROM split WHERE country!=''ORDERBY id;
SELECT*FROM countries;
id|country
1|USA
1|Germany
1|Mexico
2|Brazil
2|Canada
3|Peru
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