1 about the name regulation for table,store procedure,view ..
normally, each different kind of object should be named with specific flag, such as table named as Tab_*, store procedure named as Pr_*, view named as V_*,....
2 use sql scripts to populate some query scripts, such as
eg. there are many tables, which are named as ds_in_*, then we wanna check each table and its record count concerned. we can write the following scripts:
select 'select ''' + name + ''', count(*) from ' + name
from sys.objects
where type = 'U'
and name like 'ds_in%'
then result will be
select ds_in_bom,count(*) from ds_in_bom
select ds_in_..,count(*) from ds_in_*...
3 when write some query scripts, we should put the "," before each field, not behind each field
eg.
select a
,b
,c
,d
from table
where
a=*&^**
and b=**&....
4. duplicated select example:
e.g 1
select CurCust.Name
,CurCurst.Discount
(
select Avg(AvgCust1.Discount)
from Customer AvgCust1
where Curcurst.ShipCity=AvgCust1.ShipCity
)
as CityAvg
,Curcust.Discount/
(
select Avg(AvgCust2.Discount)
from Customer AvgCust2
where CurCust.shipcity=AvgCust2.shipcity
)
as timesCityAvg
from Customer CurCust
e.g.2
select
(select studentname from student where student.studentno=sc.studentno) as 学生姓名
,studentno as 学生学号
,avg(score) as 个人平均成绩
,(select avg(score) from sc) as 全班平均成绩
, case
when avg(score) >(select avg(score) from sc) then 'better than avg'
else 'worse than average'
end
as 评价
from sc
group by studentno