使用CASE表达式替代SQL Server中的动态SQL(二)
talsales
FROM dbo.Customer
WHERE statecode = CASE WHEN @statecode IS NOT NULL THEN @statecode
ELSE statecode
END
ORDER BY
CASE @sortdirection
WHEN 'asc' THEN
CASE @sortby
WHEN 'firstname' THEN firstname
WHEN 'lastname' THEN lastname
END www.2cto.com
END
CASE @sortdirection
WHEN 'desc' THEN
CASE @sortby
WHEN 'firstname' THEN firstname
WHEN 'lastname' THEN lastname
END
END
DESC
GO
EXEC dbo.getCustomerData 'lastname', 'desc', 'MA'
作者 黄钊吉