Increment Days in SQL query - sql

Question

I am trying to write a query that will output the following table:
|Day_0_Revenue|Day_1_Revenue|Day_2_Revenue|....|Day_90_Revenue|
The data looks like the following table. Each day will have multiple values, and I want to sum the revenue for each day. Day 0 is 11/1.
|Date|Revenue|
11/1 5
11/2 3
11/3 5
11/3 7
11/4 8
11/5 8
11/5 12
11/6 7
I believe this is simple to do if the table I want is vertical. The reason I want to output horizontally is because I will fill the table vertically with other dates. My main question is how to increment the day value without writing a really long SELECT clause? I'm not sure if I can write a loop that will have something like Day+1 until Day=90...

Answer 1

This is not possible in SQLite alone.
The easiest way would be to just use GROUP BY day to create a vertically oriented table, and then reorder the cells when you are displaying them.
If you really must get a horizontally oriented table from the database, you have to create the query dynamically:
SELECT (SELECT SUM(Revenue) FROM MyTable WHERE Date = '11/1') AS Day_0_Revenue,
(SELECT SUM(Revenue) FROM MyTable WHERE Date = '11/2') AS Day_1_Revenue,
(SELECT SUM(Revenue) FROM MyTable WHERE Date = '11/3') AS Day_2_Revenue,
...
You have to do this in whatever programming language you are using to access the database:
sql = "SELECT"
for i in range(90):
sql += " (SELECT SUM(Revenue) FROM MyTable" +
" WHERE Date = '%s') AS Day_%d_Revenue," % (dates[i], i)
sql = sql[:-1] # remove last comma
cursor = db.execute(sql)