SQL 多行值合并为一个值
方法(1)
SELECT stuff((select ','+ltrim(ColumnName) from #A for xml path('')
),1,1,'')
/*
102,103,104,105
*/
方法(2)
DECLARE @s NVARCHAR(1000)='';
SELECT @s+=ColumnName+',' from #A;
SELECT @s;
相关文档：
从Table 表中取出第 m 条到第 n 条的记录：(Not In 版本)
SELECT TOP n-m+1 *
from Table
WHERE (id NOT IN (SELECT TOP m-1 id from Table ))
--从TABLE表中取出第m到n条记录 (Exists版本)
SELECT TOP n-m+1 * from TABLE AS a WHERE Not Exists
(Select * from (Select Top m-1 * from TABLE orde ......
追加：row_number, rank, dese_rank, ntile
1. row_number: 为查询出来的每一行记录生成一个序号。
SELECT row_number() OVER(ORDER BY field) AS row_n
from tablename;
分页查询：
with t_towtable
as (select row_number over(order by field1) as row_number from tb)
select * from t_rowtable where row_numbe ......
if not object_id('Tempdb..#T') is null
drop table #T
Go
Create table #T([ID] int,[Name] nvarchar(1),[Memo] nvarchar(2))
Insert #T
select 1,N'A',N'A1' union all
select 2,N'A',N'A2' union all
select 3,N'A',N'A3' union all
select 4,N'B',N'B1' union all
select 5,N'B',N'B2'
G ......
找出TABLE1中
Column1 满足value1
或者
Column2 满足value2
或者
Column3 满足value3
的纪录
SELECT top 10 * from TABLE1
WHERE
CASE WHEN COLUMN1='value1' THEN 1
ELSE
(CASE WHEN COLUMN2='value2' THEN 1
ELSE
(CASE WHEN COLUMN3=value3 THEN 1 ELSE 0 END)
END)
END =1 ......
一、 PL/SQL语言简介
(本讲义之所有程序均调式通过)
首先我们看一个简单之例子,下面这个例子是统计从1至100的总和.
declare
i number:=0; /*声明变量井给初值*/
t number:=1;
error_message exception; /*声明一个出错处理*/
begin
......
