我有一张表，即3列和5437行的结算。 第一列有8组（A，B，C，D，E，F，G，H），第二列有＆＃39; 6＆＃39;组（城市，城镇，岛，郊区，哈姆雷特）
我的表格如下......
ID district_name Cluster Population
1003 A village 1543
1002 B town 63437
1003 C village 1698
1002 D town 11785
1040 E hamlet 100
2034 F hamlet 190
4003 G city 207561
4243 H Suburb 682
674 D Island 718
1012 A village 1566
1040 F hamlet 200
1020 D town 11881
4055 D city 208763
我想根据以下条件计算每个地区的人口百分比;
total population in each district/sum(population)*100
where cluster='city' or cluster='town'
感谢任何帮助 **我渴望的一个实际例子**
district_name Population_total（城市+城镇+岛屿）Urban_Percentage（Town_City）
D 233147 99.69(232429/233147 * 100)
答案 0 :(得分：0)
<强> SQL DEMO
std::move<强>输出
WITH district as (
SELECT district_name,
sum("Population") as district_total
FROM residentioal
where "Cluster"='city' or "Cluster"='town'
GROUP BY district_name
), whole_total as (
SELECT district_name, sum("Population") as total
FROM residentioal
GROUP BY district_name
)
SELECT d.district_name,
total as whole_total,
district_total as city_town_total,
district_total * 100.0 / total as PP
FROM district d
JOIN whole_total w
ON d.district_name = w.district_name
修改
<强> SQL DEMO
您实际上只需一个查询即可：
| district_name | whole_total | city_town_total | pp |
|---------------|-------------|-----------------|-------------------|
| D | 233147 | 232429 | 99.69203978605772 |
| B | 63437 | 63437 | 100 |
| G | 207561 | 207561 | 100 |