নিম্নলিখিত কোড ব্যবহার করে দেখুন:
CREATE TABLE #Names
(
[Type] VARCHAR(50),
ColNum SMALLINT,
ColName VARCHAR(50),
ColDataType VARCHAR(20)
)
INSERT INTO #Names VALUES
('Customer', 1, 'CustomerID', 'INT'),
('Customer', 2, 'CustomerName', 'VARCHAR(50)'),
('Customer', 3, 'CustomerJoinDate', 'DATE'),
('Customer', 4, 'CustomerBirthDate', 'DATE'),
('Account', 1, 'AccountID', 'INT'),
('Account', 2, 'AccountName', 'VARCHAR(50)'),
('Account', 3, 'AccountOpenDate', 'DATE'),
('CustomerAccount', 1, 'CustomerID', 'INT'),
('CustomerAccount', 2, 'AccountID', 'INT'),
('CustomerAccount', 3, 'RelationshipSequence', 'TINYINT')
CREATE TABLE #Data
(
[Type] VARCHAR(50),
Col1 VARCHAR(50),
Col2 VARCHAR(50),
Col3 VARCHAR(50),
Col4 VARCHAR(50),
Col5 VARCHAR(50),
Col6 VARCHAR(50),
Col7 VARCHAR(50)
)
INSERT INTO #Data VALUES
('Customer', '1', 'Mr John Smith', '2005-05-20', '1980-11-15', NULL, NULL, NULL),
('Customer', '2', 'Mrs Hayley Jones', '2009-10-10', '1973-04-03', NULL, NULL, NULL),
('Customer', '3', 'ACME Manufacturing Ltd', '2012-12-01', NULL, NULL, NULL, NULL),
('Customer', '4', 'Mr Michael Crocker', '2014-01-13', '1957-01-23', NULL, NULL, NULL),
('Account', '1', 'Smith-Jones Cheque Acct', '2005-05-25', NULL, NULL, NULL, NULL),
('Account', '2', 'ACME Business Acct', '2012-12-01', NULL, NULL, NULL, NULL),
('Account', '3', 'ACME Social Club', '2013-02-10', NULL, NULL, NULL, NULL),
('Account', '4', 'Crocker Tipping Fund', '2014-01-14', NULL, NULL, NULL, NULL),
('CustomerAccount', '1', '1', '1', NULL, NULL, NULL, NULL),
('CustomerAccount', '2', '1', '2', NULL, NULL, NULL, NULL),
('CustomerAccount', '2', '3', '2', NULL, NULL, NULL, NULL),
('CustomerAccount', '3', '2', '1', NULL, NULL, NULL, NULL),
('CustomerAccount', '3', '3', '1', NULL, NULL, NULL, NULL),
('CustomerAccount', '4', '2', '2', NULL, NULL, NULL, NULL),
('CustomerAccount', '4', '4', '1', NULL, NULL, NULL, NULL)
DECLARE @Type VARCHAR(50) = 'Account' -- Or Customer, or CustomerAccount
DECLARE @SQLText NVARCHAR(MAX) = ''
SELECT @SQLText += 'SELECT '
SELECT @SQLText += ( -- Add in column list, with dynamic column names.
SELECT 'CONVERT(' + ColDataType + ', Col' + CONVERT(VARCHAR, ColNum) + ') AS [' + ColName + '],'
FROM #Names
WHERE [Type] = @Type FOR XML PATH('')
)
SELECT @SQLText = LEFT(@SQLText, LEN(@SQLText) - 1) + ' ' -- Remove trailing comma
SELECT @SQLText += 'FROM #Data WHERE [Type] = ''' + @Type + ''''
PRINT @SQLText
EXEC sp_executesql @SQLText
এটি নির্বাচনের বিবৃতি প্রদান করে: SELECT CONVERT(INT, Col1) AS [AccountID],CONVERT(VARCHAR(50), Col2) AS [AccountName],CONVERT(DATE, Col3) AS [AccountOpenDate] FROM #Data WHERE [Type] = 'Account'