Sql 如何从表中的两列中获取逗号分隔的列表

有将列转换为字符串列表的例子，但我喜欢相信我的情况是不同的

我正在做一个监视磁盘空间增长的项目，从下表中，我想得到如下内容：

Drive [Next Autogrowth]                           [DB Files]
F     Database IntEng2 will grow 2 GB in 27 Weeks Data
G     N/A                                         Transaction Log
H     N/A                                         Data, Transaction Log
I     N/A                                         TempDB Data, TempDB Transaction Log

我成功地获得了[Next Autogrowth]，但我正在与[DB Files]列斗争

你能帮忙吗

有两条规则需要遵循：

1) when in the FILE_TYPE column there is ROW 
     A) when in the DATABASENAME column you have "tempdb" - add "TempDB Data" to the [DB Files] ELSE write "Data"

2) when in the FILE_TYPE column there is LOG
     A) when in the DATABASENAME column you have "tempdb" - add "TempDB Transaction Log" to the [DB Files] ELSE write "Transaction Log"

表格如下：

SET NOCOUNT ON

DECLARE @T TABLE( 
                DRIVE NCHAR(1)
                ,FILE_TYPE NVARCHAR(20)
                ,DATABASENAME NVARCHAR(100)
                ,AUTOGROWTH_IN_MB INT 
                ,WEEKS_TO_AUTOGROWTH INT 
                ,MONTHS_TO_AUTOGROWTH INT 
            )


INSERT INTO @T (DRIVE,FILE_TYPE,DATABASENAME,AUTOGROWTH_IN_MB,WEEKS_TO_AUTOGROWTH,MONTHS_TO_AUTOGROWTH) VALUES('F','ROWS','Bocss2',1024,218,49)
INSERT INTO @T (DRIVE,FILE_TYPE,DATABASENAME,AUTOGROWTH_IN_MB,WEEKS_TO_AUTOGROWTH,MONTHS_TO_AUTOGROWTH) VALUES('F','ROWS','IntEng2',2048,27,7)
INSERT INTO @T (DRIVE,FILE_TYPE,DATABASENAME,AUTOGROWTH_IN_MB,WEEKS_TO_AUTOGROWTH,MONTHS_TO_AUTOGROWTH) VALUES('H','ROWS','Shop',64,0,0)
INSERT INTO @T (DRIVE,FILE_TYPE,DATABASENAME,AUTOGROWTH_IN_MB,WEEKS_TO_AUTOGROWTH,MONTHS_TO_AUTOGROWTH) VALUES('G','LOG','Bocss2',2048,147,87)
INSERT INTO @T (DRIVE,FILE_TYPE,DATABASENAME,AUTOGROWTH_IN_MB,WEEKS_TO_AUTOGROWTH,MONTHS_TO_AUTOGROWTH) VALUES('G','LOG','IntEng2',1000,254,133)
INSERT INTO @T (DRIVE,FILE_TYPE,DATABASENAME,AUTOGROWTH_IN_MB,WEEKS_TO_AUTOGROWTH,MONTHS_TO_AUTOGROWTH) VALUES('G','LOG','Shop',64,0,0)
INSERT INTO @T (DRIVE,FILE_TYPE,DATABASENAME,AUTOGROWTH_IN_MB,WEEKS_TO_AUTOGROWTH,MONTHS_TO_AUTOGROWTH) VALUES('H','LOG','Bocss2',2014,147,87)
INSERT INTO @T (DRIVE,FILE_TYPE,DATABASENAME,AUTOGROWTH_IN_MB,WEEKS_TO_AUTOGROWTH,MONTHS_TO_AUTOGROWTH) VALUES('H','LOG','IntEng2',512,255,133)
INSERT INTO @T (DRIVE,FILE_TYPE,DATABASENAME,AUTOGROWTH_IN_MB,WEEKS_TO_AUTOGROWTH,MONTHS_TO_AUTOGROWTH) VALUES('I','ROWS','tempdb',1024,2046,614)
INSERT INTO @T (DRIVE,FILE_TYPE,DATABASENAME,AUTOGROWTH_IN_MB,WEEKS_TO_AUTOGROWTH,MONTHS_TO_AUTOGROWTH) VALUES('I','ROWS','tempdb',1024,2046,682)
INSERT INTO @T (DRIVE,FILE_TYPE,DATABASENAME,AUTOGROWTH_IN_MB,WEEKS_TO_AUTOGROWTH,MONTHS_TO_AUTOGROWTH) VALUES('I','ROWS','tempdb',1024,2046,613)
INSERT INTO @T (DRIVE,FILE_TYPE,DATABASENAME,AUTOGROWTH_IN_MB,WEEKS_TO_AUTOGROWTH,MONTHS_TO_AUTOGROWTH) VALUES('I','ROWS','tempdb',1024,2046,682)
INSERT INTO @T (DRIVE,FILE_TYPE,DATABASENAME,AUTOGROWTH_IN_MB,WEEKS_TO_AUTOGROWTH,MONTHS_TO_AUTOGROWTH) VALUES('G','LOG','tempdb',1024,2,1)


SELECT * FROM @T

我目前的情况是：

;WITH R1 AS (
select
   *
   ,the_closest_event=ROW_NUMBER() OVER (PARTITION BY DRIVE ORDER BY 
                                     CASE WHEN (WEEKS_TO_AUTOGROWTH < CAST(MONTHS_TO_AUTOGROWTH * 4.3 AS INT)) THEN 
                                          WEEKS_TO_AUTOGROWTH ELSE MONTHS_TO_AUTOGROWTH 
                                      END ) 
   ,NextAutoGrowth= CASE WHEN (DATABASENAME = 'tempdb')
                      OR (FILE_TYPE = 'LOG' ) THEN 'N\A' 
                   ELSE 

                     CASE WHEN (WEEKS_TO_AUTOGROWTH < CAST(MONTHS_TO_AUTOGROWTH * 4.3 AS INT)) THEN  --4.3 BECAUSE 1 MONTH = 4.3 WEEKS
                                CASE WHEN (WEEKS_TO_AUTOGROWTH > 0) THEN 
                                 'Database ' + DATABASENAME + ' will grow ' +  

                                   CASE WHEN (AUTOGROWTH_IN_MB >= 1024) THEN -- 1 GB 

                                        CAST(CAST(CAST ( AUTOGROWTH_IN_MB / 1024.00 AS NUMERIC(18,2) )AS REAL) AS VARCHAR) + ' GB in '
                                     ELSE -- use MB
                                        CAST (AUTOGROWTH_IN_MB AS VARCHAR) + ' MB in '
                                   END /*case autogrowth is greater than 1 GB*/

                                  + CAST (WEEKS_TO_AUTOGROWTH AS VARCHAR) + ' Weeks' 
                                  ELSE 'N\A' 

                                END /*case number of weeks > 0*/
                        ELSE
                                CASE WHEN (MONTHS_TO_AUTOGROWTH > 0) THEN 
                                 'Database ' + DATABASENAME + ' will grow ' +  

                                   CASE WHEN (AUTOGROWTH_IN_MB >= 1024) THEN -- 1 GB 

                                        CAST(CAST(CAST ( AUTOGROWTH_IN_MB / 1024.00 AS NUMERIC(18,2) )AS REAL) AS VARCHAR) + ' GB in '
                                     ELSE -- use MB
                                        CAST (AUTOGROWTH_IN_MB AS VARCHAR) + ' MB in '
                                   END /*case autogrowth is greater than 1 GB*/

                                  + CAST (MONTHS_TO_AUTOGROWTH AS VARCHAR) + ' Months' 
                                  ELSE 'N\A' 

                                END /*case number of months > 0 */

                     END /*CASE - weeks or months */

            END /*case when it is tempdb */
 from @T
 )

 SELECT 
 * FROM R1

---

尝试以下查询-这可能会有所帮助

select 
DRIVE Drive,
CASE 
    WHEN FILE_TYPE = 'rows' THEN
    CASE 
        WHEN DATABASENAME = 'tempdb' THEN 'TempDB Data' 
        ELSE 'Data'
    END 
WHEN FILE_TYPE = 'log' THEN 
    CASE
        WHEN DATABASENAME = 'tempdb' THEN 'Data, TempDB Transaction Log' 
        ELSE 'Data, Transaction Log'
    END
ELSE  ''
END 
DBFiles
from 
t

有趣的问题：

;with x as (
select distinct drive, case file_type when 'ROWS' then
            case databasename when 'tempdb' then 'TempDB Data' else 'Data' end
            else 
            case databasename when 'tempdb' then 'TempDB Transaction Log' else 'Transaction Log' end
        end as typ
from @T
),
a as (
    select *, row_number() over(partition by drive order by weeks_to_autogrowth) as rn
    from @t
)
select distinct x.drive, 
case when a.autogrowth_in_mb > 0 and a.weeks_to_autogrowth > 0 then
    'Database ' + a.databasename + ' will grow ' + cast(a.autogrowth_in_mb/1024. as varchar) + ' GB in ' + cast(a.weeks_to_autogrowth as varchar) + ' weeks' 
else 'N/A' end as [Next Autogrowth],
substring(y.list, 1, len(y.list)-1)
from 
x
inner join a on x.drive = a.drive and a.rn = 1
cross apply 
(
    select t2.typ + ', ' as [text()]
    from x t2
    where t2.drive = x.drive
    for xml path('')
) y(list)