1.子句按照from where group by having select Order by 的顺序进行逻辑处理
2.select OrderID from Sales.Orders order by OrderID offset 50 rows fetch next 25 rows only (跳过50行选择下面的25行)(sqlserver2012支持)
3.当一个表的字段太多时,可以把高频字段和低频字段提炼出来
4.select stuff((select ','+Code from tFlutes for xml path('')), 1, 1, '') (把一列数据合并成一个并用逗号隔开)
5.select stuff((select ','+COLUMN_NAME from (SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.columns
WHERE TABLE_NAME='Order_tCustomProduct')a for xml path('')), 1, 1, '') (获取一个表的所有字段合并成一个字段并用逗号隔开)