经典T-SQL代码

1. N到M条记录(要有主索引ID)
SelectTop M-N *From [Table] Where ID in (SelectTop M ID From [Table]) Orderby ID  Desc

2.
查询逻辑顺序
(8) SELECT (9) DISTINCT (11) <TOP_specification><select_list>
(1) FROM<left_table>
(3) <join_type>JOIN<right_table>
(2) ON<join_condition>
(4) WHERE<where_condition>
(5) GROUPBY<group_by_list>
(6) WITH {CUBE | ROLLUP}
(7) HAVING<having_condition>
(10) ORDERBY<order_by_list>

3.
日期转换参数,值得收藏
selectCONVERT(varchar, getdate(), 120 )
2004-09-1211:06:08

selectreplace(replace(replace(CONVERT(varchar, getdate(), 120 ),‘-‘,‘‘),‘‘,‘‘),‘:‘,‘‘)
20040912110608

selectCONVERT(varchar(12) , getdate(), 111 )
2004/09/12

selectCONVERT(varchar(12) , getdate(), 112 )
20040912

selectCONVERT(varchar(12) , getdate(), 102 )
2004.09.12

4. 一个月第一天
SELECT   DATEADD(mm,   DATEDIFF(mm,0,getdate()),   0) 
--  2009-06-01 00:00:00.000

5. 分页SQL语句
select*from(select (row_number() OVER (ORDERBY tab.ID Desc)) as rownum,tab.*from 表名As tab) As t where rownum between 起始位置And 结束位置
6. 获取当前数据库中的所有用户表
select*from sysobjects where xtype=‘U‘and category=0
7. 获取某一个表的所有字段
select name from syscolumns where id=object_id(‘表名‘)

8. 查看与某一个表相关的视图、存储过程、函数
select a.*from sysobjects a, syscomments b where a.id = b.id and b.textlike‘%表名%‘
9. 查看当前数据库中所有存储过程
select name as 存储过程名称from sysobjects where xtype=‘P‘
10. 查询某一个表的字段和数据类型
select column_name,data_type from information_schema.columns where table_name =‘表名‘
11. 删除重复值