使用MySQL查询

Question

我在mysql数据库中的以下表

我想要得到的结果在下面的格式

Answer 1

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 

Answer 2

这是一个典型的表改变MySQL表的格式请点击以下链接：

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