如何在Postgres中分组并返回sum行

Question

我被困在这里。我在Postgres有这样的行：

id      amount
a       5000
a       1500
a       500
b       2000
b       1000
c       4000

sql语法如何得到这样的结果？

id      amount
a       7000
b       3000
c       4000

Answer 1

SELECT id, SUM(amount) AS amount
FROM yourtable
GROUP BY id