Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
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create table t(
date date,
type text,
price int
);
insert into t values
("2020-01-01", "laptop", "210"),
("2020-01-01", "pc", "100"),
("2020-01-02", "laptop", "150"),
("2020-01-02", "pc", "200"),
("2020-01-03", "laptop", "150"),
("2021-01-01", "pc", "110"),
("2021-01-01", "laptop", "220"),
("2021-01-02", "pc", "210"),
("2021-01-02", "laptop", "200"),
("2021-01-03", "pc", "26");
select date, abs(sum-first_month_value)/2 from (select
sum(price) as sum,
count(date) as count,
date,
first_value(sum(price)) over() as first_month_value
from t
group by
date
order by date) as t;
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