Question

我在select查询中写了一个case语句，如下所示。我不确定SQL Server中If else的语法，我也想使用＆＃39;作为＆＃39;来命名列。但它的错误表示错误的语法接近＆＃39;。请帮忙。 Ť

select 
    a.account_id as [Account Id],
    substring(a.account_id,1,3) as [Company ID],
    substring(a.account_id,4,6) as [Account No],
    substring(a.account_id,10,5) as [Cost Center],
    b.amount as Amount,
    b.period as Period,
    getdate() as SysDate,
    format(getdate(), 'mm/dd/yyyy') as SYSDtText,
    substring('SYSDtText',1,2) as [Current Period],
    b.year_budget as [Year Budget],
    substring('SYSDtText', 7, 4 ) as SysDtYearText,
    case 
       when Period <= 'Current Period' 
          then 'include' 
          else '' 
    as [Period Include Flag], 
    a.description as [Description]
from 
    period_summary b
inner join 
    account a on b.account_id = a.account_id;

Answer 1

您错过了＆＃34;结束＆＃34;

正确：

{{1}}

Answer 2

我认为您需要更改此行：

CASE WHEN Period<='Current Period' then 'include' else '' as [Period Include Flag],

到此：

CASE WHEN Period <= substring('SYSDtText',1,2) then 'include' else '' end as [Period Include Flag],

目前，您正在将[期间]与字符串文字＆＃39;当前期间＆＃39;进行比较。 - 我不认为这是您打算做的，因为您的查询中有一列称为[当前期间]。

SQL Server- if else / case when语句

2 个答案: