c# - 我如何从 sql 中获取所有月份？

Question

我有以下数据的表名“工资单”

month , pay
January , 1200
March , 1500
December , 2000

我想要存储过程的水晶报告中的以下结果我想要一个显示此结果的 SQL 查询

Janury , 1200
February , 000
March , 1500
April , 000
May , 000
June , 000
July , 000
August , 000
September , 000
October , 000
November , 000
December , 2000

请帮忙查询。

提前致谢

Answer 1

尝试更改您的查询 -

SELECT [month], pay = ISNULL(pay, 0) 
FROM (
    VALUES
        ('January'),
        ('February'),
        ('March'),
        ('April'),
        ('May'),
        ('June'),
        ('July'),
        ('August'),
        ('September'),
        ('October'),
        ('November'),
        ('December')
) t([month])
LEFT JOIN <your_table> ON ....

Answer 2

在 SQL Server 中，您可以这样做：

WITH Months AS (
              SELECT 'January' AS MonthName
    UNION ALL SELECT 'February'
    UNION ALL SELECT 'March'  
    ...
)
SELECT Months.MonthName
      ,COALESCE(Payroll.Pay, 0)
FROM Months
     LEFT JOIN Payroll
         ON Months.MonthName = Payroll.Month

Answer 3

你可能需要这样的东西。

declare @monthno int
declare @month varchar(50)

create table #month_tmp 
    ( mont varchar(20) null,number int null) 

set @monthno = 1
while @monthno < 13
begin
    SET @month=DateName(Month,cast(@monthno as varchar) + '-01-2001')

   insert into #month_tmp
    select @month, 0

    set @monthno = @monthno + 1
end

select [month],pay from payroll
union
select mont,number
from #month_tmp

drop table #month_tmp

Answer 4

您可以创建另一个包含所有 12 个月的表。然后使用 with payrolltable 执行外连接。