T-SQL :: 列出所有表、列和透视内容

Question

我正在使用 SSMS 工具 Data Discovery and Classification。

该工具会自动搜索列名称，如%address%、%name%、%surname%、%e-mail%、%tax%、%zip% 等... 并且很好地向您建议它可能是一个明智的数据。

事实上，在盎格鲁-撒克逊社会之外，列名不是英文的，但可以是法文、西班牙文、意大利文等。

所以我找到了一个查询，可以帮助我根据我的语言列出合理的数据：

SELECT schema_name(tab.schema_id) AS schema_name
    ,tab.name AS table_name
    ,col.name AS column_name
    ,t.name AS data_type
    ,NULL as Data_Preview
FROM sys.tables AS tab
INNER JOIN sys.columns AS col ON tab.object_id = col.object_id
LEFT JOIN sys.types AS t ON col.user_type_id = t.user_type_id
ORDER BY schema_name
    ,table_name
    ,column_id;

非常好。

但如果我可以添加一个名为 Content 的最后一列会更好

你能帮我存档吗？

这将是一个 DYO 数据发现和分类。

编辑：我可能表达得很糟糕。

我正在针对 AdventureWorks2019 运行 mz 查询：

schema_name	table_name	column_name	data_type	Data_Preview
Person	Address	AddressID	int	NULL
Person	Address	AddressLine1	nvarchar	NULL
Person	Address	AddressLine2	nvarchar	NULL
Person	Address	City	nvarchar	NULL
Person	Address	StateProvinceID	int	NULL
Person	Address	PostalCode	nvarchar	NULL

我想PIVOT 每一列的内容（比如说TOP 5）到最后一列

schema_name	table_name	column_name	data_type	Data_Preview
Person	Address	AddressID	int	1,2,3,4,5
Person	Address	AddressLine1	nvarchar	1970 Napa Ct.,9833 Mt. Dias Blv.,7484 Roundtree Drive,9539 Glenside Dr,1226 Shoe St.
Person	Address	AddressLine2	nvarchar	NULL,NULL,NULL,NULL,NULL
Person	Address	City	nvarchar	Bothell,Bothell,Bothell,Bothell,Bothell
Person	Address	StateProvinceID	int	79,79,79,79,79
Person	Address	PostalCode	nvarchar	98011,98011,98011,98011,98011

每个数据可以用逗号或其他分隔。结果是我想预览列中实际存在的数据：

这家伙显然是来存档的：

• https://docs.microsoft.com/en-us/answers/questions/285445/how-to-get-column-values-in-one-comma-separated-va.html
• Pivot and comma Separated value
• https://www.mikekale.com/rows-to-comma-separated-lists-in-sql-server/

谢谢

Answer 1

已更新以支持 2016

DROP TABLE IF EXISTS #ColumnsToDisplay

SELECT    ROW_NUMBER () OVER (ORDER BY tab.name) AS Iteration,
          s.name AS SchemaName,
          tab.name AS table_name,
          col.column_id,
          col.name AS column_name,
          t.name AS data_type,
          col.max_length,
          col.precision AS PrecisionNumber,
          CAST(NULL AS VARCHAR(MAX)) AS DataSample
INTO      #ColumnsToDisplay
FROM      sys.tables AS tab
JOIN      sys.schemas AS s
    ON    s.schema_id = tab.schema_id
JOIN      sys.columns AS col
    ON    col.object_id = tab.object_id
LEFT JOIN sys.types AS t
    ON    col.user_type_id = t.user_type_id
     
DECLARE @Iterations       INT = 0,
        @CurrentIteration INT = 1;

SELECT @Iterations = MAX (Iteration)
FROM   #ColumnsToDisplay

WHILE @CurrentIteration <= @Iterations
BEGIN
    DECLARE @CurrentTableName  VARCHAR(100)   = '',
            @CurrentColumnName VARCHAR(100)   = '',
            @DynamicQuery      NVARCHAR(1000) = N''
    DECLARE @Sample VARCHAR(MAX)

    SET @CurrentTableName = '';
    SET @DynamicQuery = N'';
    SELECT @CurrentTableName = CONCAT (ttq.SchemaName, '.', ttq.table_name),
           @CurrentColumnName = ttq.column_name
    FROM   #ColumnsToDisplay AS ttq
    WHERE  ttq.Iteration = @CurrentIteration

    IF (@CurrentTableName = '')
    BEGIN
        SET @CurrentIteration += 1

        CONTINUE
    END

 -- SQL Server 2019
 -- SET @DynamicQuery = CONCAT (N'
 --       SELECT @Sample = STRING_AGG(t.ColumnData,'', '') 
 --       FROM (
 --               SELECT TOP 5  CAST(x.[', @CurrentColumnName, '] AS VARCHAR(MAX)) AS ColumnData 
 --               FROM ', @CurrentTableName, ' AS x 
 --               WHERE x.[', @CurrentColumnName, '] IS NOT NULL
 --       )t')

 -- SQL Server 2016 and lower where Stuff is supported   
    SET @DynamicQuery = CONCAT (N'
    SELECT @Sample =  STUFF((SELECT '', ''+ t.ColumnData  
    FROM (
            SELECT TOP 5 CAST(x.[', @CurrentColumnName, '] AS VARCHAR(MAX)) AS ColumnData 
            FROM ', @CurrentTableName, ' AS x 
            WHERE x.[', @CurrentColumnName, '] IS NOT NULL 
    ) AS t
       FOR XML PATH('''')),1,1,'''')')
        
    EXECUTE sys.sp_executesql @DynamicQuery,
                              N'@Sample VARCHAR(MAX) OUTPUT',
                              @Sample = @Sample OUTPUT

    UPDATE #ColumnsToDisplay
    SET    DataSample = @Sample
    WHERE  Iteration = @CurrentIteration

    SET @CurrentIteration += 1
END

SELECT ctd.Iteration,
       ctd.SchemaName,
       ctd.table_name,
       ctd.column_id,
       ctd.column_name,
       ctd.data_type,
       ctd.max_length,
       ctd.PrecisionNumber,
       ctd.DataSample
FROM   #ColumnsToDisplay AS ctd