Sql 在两个新列中显示数据

我有一张表，在那里我储存了地质样品，它们的价值是金和银

CREATE TABLE samples
(
     id INT, 
     element VARCHAR (10), 
     value INT, 
);

INSERT INTO samples VALUES (1, 'gold', 100);
INSERT INTO samples VALUES (1, 'silver', 150);
INSERT INTO samples VALUES (2, 'gold', 200);
INSERT INTO samples VALUES (2, 'silver', 300);

身份证件 要素 价值 1 金 100 1 银 150 2 金 200 2 银 300

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您可以使用条件聚合：

select id,
       sum(case when element = 'gold' then value end) as gold,
       sum(case when element = 'silver' then value end) as silver
from samples s
group by id;

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您可以使用条件聚合：

select id,
       sum(case when element = 'gold' then value end) as gold,
       sum(case when element = 'silver' then value end) as silver
from samples s
group by id;

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它就像一个符咒！它就像一个符咒！