SQL Server在不知道列名的情况下从表中选择数据

Question

This is sample data table.

I want to select values in any rows or any column (equals) = 200 with column names.But we don't know column names .

Answer 1

如果您知道表名，则可以使用SQLServer 2005或更高版本查询INFORMATION_SCHEMA.TABLES和INFORMATION_SCHEMA.COLUMNS ，或者使用SQLServer 2000来查询sysobjects和syscolumns来检索表列，之后，您可以根据需要创建完全引用的查询

Answer 2

I think the below T-SQL will get you what you want. It was written against AdventureWorks2012LT. In the future, you can get more specific help by including the SQL create statements with your question (so the responder doesn't have to recreate the tables) (BTW, My example is looking for any field that contains the letter 'S')

DECLARE @column_name nvarchar(200);
DECLARE @statement nvarchar(max);

DECLARE @results TABLE(
id int,
colname nvarchar(200),
value nvarchar(max)
)

DECLARE col_cursor CURSOR FOR
SELECT C.COLUMN_NAME AS col
FROM INFORMATION_SCHEMA.COLUMNS C WHERE C.TABLE_NAME LIKE 'Address'

OPEN col_cursor
FETCH NEXT FROM col_cursor INTO @column_name

WHILE @@FETCH_STATUS = 0
BEGIN
PRINT @column_name
SELECT @statement = N'SELECT AddressID, ''' + @column_name + ''' AS ColName, ' + @column_name + ' AS value FROM SalesLT.[Address] WHERE ' + @column_name + ' LIKE ''%S%''';

INSERT INTO @results
EXEC(@statement);

FETCH NEXT FROM col_cursor INTO @column_name
END

CLOSE col_cursor
DEALLOCATE col_cursor

SELECT * FROM @results