使用mysql查询

Question

我在mysql数据库

中有以下表格

我希望以下列格式获得结果

Answer 1

这是典型的表格枢轴问题，请尝试以下操作：

select
    customerName,
    coalesce(max(case when month(`date`) = 1 then paidamount end), '-') as `January` ,
    coalesce(max(case when month(`date`) = 2 then paidamount end), '-') as `February`,
    coalesce(max(case when month(`date`) = 3 then paidamount end), '-') as `March`,
    coalesce(max(case when month(`date`) = 4 then paidamount end), '-') as `April`,
    coalesce(max(case when month(`date`) = 5 then paidamount end), '-') as `May`,
    coalesce(max(case when month(`date`) = 6 then paidamount end), '-') as `June`,
    coalesce(max(case when month(`date`) = 7 then paidamount end), '-') as `July`,
    coalesce(max(case when month(`date`) = 8 then paidamount end), '-') as `August`,
    coalesce(max(case when month(`date`) = 9 then paidamount end), '-') as `September`,
    coalesce(max(case when month(`date`) = 10 then paidamount end), '-') as `October`,
    coalesce(max(case when month(`date`) = 11 then paidamount end), '-') as `November`,
    coalesce(max(case when month(`date`) = 12 then paidamount end), '-') as `December`
from yourtable
group by customerName

Answer 2

您可以使用此查询：

select
    customerName,
    coalesce(sum(case when month(`date`) = 1 then paidamount end), '-') as `January` ,
    coalesce(sum(case when month(`date`) = 2 then paidamount end), '-') as `February`,
    coalesce(sum(case when month(`date`) = 3 then paidamount end), '-') as `March`,
    coalesce(sum(case when month(`date`) = 4 then paidamount end), '-') as `April`,
    coalesce(sum(case when month(`date`) = 5 then paidamount end), '-') as `May`,
    coalesce(sum(case when month(`date`) = 6 then paidamount end), '-') as `June`,
    coalesce(sum(case when month(`date`) = 7 then paidamount end), '-') as `July`,
    coalesce(sum(case when month(`date`) = 8 then paidamount end), '-') as `August`,
    coalesce(sum(case when month(`date`) = 9 then paidamount end), '-') as `September`,
    coalesce(sum(case when month(`date`) = 10 then paidamount end), '-') as `October`,
    coalesce(sum(case when month(`date`) = 11 then paidamount end), '-') as `November`,
    coalesce(sum(case when month(`date`) = 12 then paidamount end), '-') as `December`
from test
group by customerName