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/*
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thid other
a 1
a 1
b 0
b 0
b 0
c 2
c 2
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thid other
a 1
a 2
b 0
b 1
b 2
c 2
c 3
*/
if OBJECT_ID('tb') is not null
drop table tb
go
create table tb (id varchar(10) ,value int)
insert tb select
'a' , 1 union all select
'a' , 1 union all select
'b' , 0 union all select
'b' , 0 union all select
'b' , 0 union all select
'c' , 2 union all select
'c' , &nb
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Suppose we have a recursive hierarchy stored in a relational database and we want to write it to XML. This might be for a variety of reasons – e.g. as a pre-cached input to a UI control, to export to another system using a pre-defined format, etc.
In SQL Server 2000, in order to ......
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declare @i int
set @i=1
while @i<101
begin
insert into Cname ([name],csex,Number) ......
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ORDER BY ID
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PreparedStatement pstmt = conn.prepareStatement("insert into guestbook(gst_user,gst_title,gst_content,gst_ip,gst_time) values(?,?,?,?,getdate())");
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select *from student
select student_id from student
select student_id ,student_name from student
select student_id student_name from student ½«student_name ×÷Ϊstudent_idµÄ±ðÃû´¦Àí
È磺 select student_id a from student
select a=student_id from student
´Óstudent±íÖзֱð¼ ......