Question

我需要在SQL中将当前月份的第1个日期显示为列名

我编写了以下查询，但没有获得正确的列名

SELECT  Citrix_ID as [Citrix ID], Full_Name as [Full Name]
  , Band, Cigna_DOJ as [Cigna DOJ]
  , [01] +' as ' + '''' + SELECT CONVERT(VARCHAR,DATEADD(month, DATEDIFF(MONTH, 0, GETDATE()), 0),106) + '''' 
FROM [dbo].[admin.Attendance]

Answer 1

您可以将Dynamic Sql用于此类用途。

示例片段：

declare @FirstDayOfMonth date = dateadd(day,1,eomonth(GetDate(),-1));
declare @ColName varchar(30) = quotename(format(@FirstDayOfMonth,'dd-MMM-yyyy'));

declare @DynSql nvarchar(max);

-- build the string for the actual query 
set  @DynSql = 'select 1 as '+ @ColName;

-- test how it looks
select @DynSql as DynSql;

-- run it
exec(@DynSql);

结果：

01-Jan-2019
-----------
1

对于您的查询，字符串可以这样构造：

set  @DynSql = 'SELECT'+char(10)+
 '  Citrix_ID as [Citrix ID]'+char(10)+
 ', Full_Name as [Full Name]'+char(10)+
 ', Band'+char(10)+
 ', Cigna_DOJ as [Cigna DOJ]'+char(10)+
 ', [01]  as '+ @ColName +char(10)+
 'FROM [dbo].[admin.Attendance]';

请注意，在Sql Server 2017+中，有一个CONCAT_WS

Answer 2

尝试如下

SELECT SELECT format( DATEADD(month, DATEDIFF(month, 0,getdate()), 0),'dd-MMM-yyyy') AS _stday AS firstday,Citrix_ID as [Citrix ID], Full_Name as [Full Name], Band, Cigna_DOJ as [Cigna DOJ]
FROM [dbo].[admin.Attendance]

Answer 3

SELECT CONVERT(VARCHAR,DATEADD(month, DATEDIFF(MONTH, 0, GETDATE()), 0),101)       as FirstDateOfMonth

Answer 4

您可以直接使用REPLACE功能

SELECT REPLACE(CONVERT(VARCHAR,DATEADD(month, DATEDIFF(MONTH, 0, GETDATE()),0),106),' ', '-') 
       as FirstDateOfTheMonth;

01-Jan-2019

如何在SQL中显示月份的第一天作为列名

4 个答案: