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我正在检查第三方 SQL Server 2008 数据库。在这个数据库中，有 2 列 CREATED_DATETIME 和 UPDATED_DATETIME，它们存在于大多数表中，但可能不是全部。

我想在数据库中具有这 2 列的所有表中找到这 2 列的最小值和最大值。这将使我清楚地知道数据库中的数据是从哪个时期到哪个时期。

我该如何编写这样的查询？

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4 回答 4

2

像下面这样的东西应该工作

DECLARE @C1           AS CURSOR,
        @TABLE_SCHEMA SYSNAME,
        @TABLE_NAME   SYSNAME,
        @HasCreated   BIT,
        @HasUpdated   BIT,
        @MaxDate      DATETIME,
        @MinDate      DATETIME,
        @SQL          NVARCHAR(MAX) 

SET @C1 = CURSOR FAST_FORWARD FOR 
SELECT TABLE_SCHEMA,
       TABLE_NAME,
       COUNT(CASE
               WHEN COLUMN_NAME = 'CREATED_DATETIME' THEN 1
             END) AS HasCreated,
       COUNT(CASE
               WHEN COLUMN_NAME = 'UPDATED_DATETIME' THEN 1
             END) AS HasUpdated
FROM   INFORMATION_SCHEMA.COLUMNS
WHERE  COLUMN_NAME IN ( 'CREATED_DATETIME', 'UPDATED_DATETIME' )
GROUP  BY TABLE_SCHEMA,
          TABLE_NAME 


OPEN @C1;

FETCH NEXT FROM @C1 INTO @TABLE_SCHEMA , @TABLE_NAME , @HasCreated , @HasUpdated ;
WHILE @@FETCH_STATUS = 0
BEGIN

SET @SQL = N'
SELECT @MaxDate = MAX(D),
       @MinDate = MIN(D)
FROM   ' + QUOTENAME(@TABLE_SCHEMA) + '.' + QUOTENAME(@TABLE_NAME) + N' 
       CROSS APPLY (VALUES ' + 
                  CASE WHEN @HasCreated = 1 THEN N'(CREATED_DATETIME),' ELSE '' END + 
                  CASE WHEN @HasUpdated = 1 THEN N'(UPDATED_DATETIME),' ELSE '' END + N'
                           (@MaxDate),
                           (@MinDate)) V(D) 

'

EXEC sp_executesql 
    @SQL,
    N'@MaxDate datetime OUTPUT, @MinDate datetime OUTPUT', 
    @MaxDate = @MaxDate OUTPUT, 
    @MinDate = @MinDate OUTPUT

  FETCH NEXT FROM @C1 INTO @TABLE_SCHEMA , @TABLE_NAME , @HasCreated , @HasUpdated ;
END

SELECT @MaxDate AS [@MaxDate], @MinDate AS [@MinDate]
于 2013-03-09T09:10:29.867 回答
0

Run the script mentioned in the link below. You will have to slightly alter as per your requirements.

SCRIPT to Search every Table and Field

于 2013-03-09T08:58:15.207 回答
0 
select MIN(CREATED_DATETIME) MinCREATED_DATETIME_Table1, MAX(CREATED_DATETIME) MaxCREATED_DATETIME_Table1, MIN(CREATED_DATETIME) MinCREATED_DATETIME_Table2, MAX(CREATED_DATETIME) MaxCREATED_DATETIME_Table2 from Table1, Table2
于 2013-03-09T08:59:33.830 回答
0

在 SSMS 中运行此脚本（CTrl+T=文本结果，F5=执行查询）：

SET NOCOUNT ON;

SELECT  'SELECT MIN(' 
        + QUOTENAME(c.COLUMN_NAME)
        + ') AS ' 
        + QUOTENAME('Min '+c.TABLE_NAME+'.'+c.COLUMN_NAME)
        + ', MAX('
        + QUOTENAME(c.COLUMN_NAME)
        + ') AS ' 
        + QUOTENAME('Max_'+c.TABLE_NAME+'.'+c.COLUMN_NAME)       
        + CHAR(13)
        + 'FROM ' + QUOTENAME(c.TABLE_SCHEMA)+'.'+QUOTENAME(c.TABLE_NAME)
FROM    INFORMATION_SCHEMA.COLUMNS c
WHERE   c.COLUMN_NAME IN ('CREATED_DATETIME', 'UPDATED_DATETIME')
ORDER BY c.TABLE_SCHEMA, c.TABLE_NAME, c.COLUMN_NAME;

SET NOCOUNT OFF;

它将生成另一个脚本。执行生成的脚本。

示例（为master数据库和low列名 >的所有表生成的脚本WHERE c.COLUMN_NAME IN (N'low')）：

SELECT MIN([low]) AS [Min spt_fallback_dev.low], MAX([low]) AS [Max_spt_fallback_dev.low]
FROM [dbo].[spt_fallback_dev]
SELECT MIN([low]) AS [Min spt_values.low], MAX([low]) AS [Max_spt_values.low]
FROM [dbo].[spt_values]
于 2013-03-09T09:14:49.440 回答