Question

我有一张表：

Name                            Size
--------------------------------------    
backup_20160426000000.comp.trn  1
backup_20160426001000.comp.trn  2
backup_20160426002000.comp.trn  4
(..)
backup_20160426230000.comp.trn  4
backup_20160426231000.comp.trn  5

我需要能够GROUP BY文本BY“小时”（20160426000000将是小时0,20160426010000将是小时1等）然后总结总大小。

输出应为：

backup_20160426000000.comp.trn  7
(..)
backup_20160426230000.comp.trn  9

目前我有：

SELECT 
    SUBSTRING(dbo.CLName.NAME, PATINDEX('%2016%', dbo.CLName.NAME), 14), size
FROM 
    dbo.CLName
GROUP BY 
    substring(Name, 1, 15)

Answer 1

由于所有字符串都具有相同的格式，因此您可以使用substring对其进行appart并重新构建，因为您已完成部分操作：

SELECT 
    SUBSTRING(name, 1, 15) + '0000.comp.trn', SUM(size)
FROM 
    dbo.CLName
GROUP BY 
    SUBSTRING(name, 1, 15)

Answer 2

使用SUBSTRING功能获取小时。

SELECT  MIN(Name) AS Name, SUM(Size) AS Size_Sum
FROM    TblBackup
GROUP   BY SUBSTRING(Name, 16, 2)

输出结果：

Name                              Size_Sum
--------------------------------------------
backup_20160426000000.comp.trn       7
backup_20160426230000.comp.trn       9

Answer 3

您可以向表中添加计算字段以获取日期和时间，如下所示。（注意：我将分钟设置为零，假设您只对整个小时感兴趣，但可以更改。）

CREATE TABLE dbo.MyBackup
(
    BackupName nvarchar(30) NOT NULL PRIMARY KEY,
    Size int NOT NULL,
    BackupDateTime AS CAST(SUBSTRING(BackupName, 8, 4) + N'-' + SUBSTRING(BackupName, 12, 2) + N'-' + SUBSTRING(BackupName, 14, 2) + N' ' + SUBSTRING(BackupName, 16, 2) + N':00' AS datetime2(0))
);
GO

然后添加样本数据。

INSERT INTO dbo.MyBackup (BackupName, Size)
    VALUES (N'backup_20160426000000.comp.trn', 1),
        (N'backup_20160426001000.comp.trn', 2),
        (N'backup_20160426002000.comp.trn', 4),
        (N'backup_20160426230000.comp.trn', 4),
        (N'backup_20160426231000.comp.trn', 5);

然后，您可以按BackupDateTime进行选择和分组，并将大小相加。

SELECT BackupDateTime, SUM(Size) AS 'Size'
    FROM dbo.MyBackup
    GROUP BY BackupDateTime
    ORDER BY BackupDateTime;

或者完全按照您的展示显示它。

SELECT N'backup_' + FORMAT(YEAR(BackupDateTime), '0000') + FORMAT(MONTH(BackupDateTime), '00') + FORMAT(DAY(BackupDateTime), '00') + FORMAT(DATEPART(hour, BackupDateTime), '00') + FORMAT(DATEPART(minute, BackupDateTime), '00') + N'00.comp.trn' AS 'Name', SUM(Size) AS 'Size'
    FROM dbo.MyBackup
    GROUP BY BackupDateTime
    ORDER BY BackupDateTime;

SQL Server：对部分文本匹配进行分组

3 个答案: