Sql Server Éú³ÉÊý¾Ý×Öµä
use Dbname
go
select
[±íÃû]=c.Name,
[±í˵Ã÷]=isnull(f.[value],''),
[ÁÐÃû]=a.Name,
[ÁÐÐò號]=a.Column_id,
[±êʶ]=case when is_identity=1 then '√' else '' end,
[Ö÷鍵]=case when exists(select 1 from sys.objects x join sys.indexes y on x.Type=N'PK' and x.Name=y.Name
join sysindexkeys z on z.ID=a.Object_id and z.indid=y.index_id and z.Colid=a.Column_id)
then '√' else '' end,
[ÀàÐÍ]=b.Name,
[×Ö½ÚÊý]=case when a.[max_length]=-1 and b.Name!='xml' then 'max/2G'
when b.Name='xml' then '2^31-1×Ö節/2G'
else rtrim(a.[max_length]) end,
[³¤¶È]=case when ColumnProperty(a.object_id,a.Name,'Precision')=-1 then '2^31-1'
else rtrim(ColumnProperty(a.object_id,a.Name,'Precision')) end,
[СÊý]=isnull(ColumnProperty(a.object_id,a.Name,'Scale'),0),
[ÊÇ·ñΪ¿Õ]=case when a.is_nullable=1 then '√' else '' end,
[ÁÐ˵Ã÷]=isnull(e.[value],''),
[ĬÈÏÖµ]=isnull(d.text,'')
from
sys.columns a &
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ch02
--3-4
select * from orders
where 'México D.F.' in
(select City
from Customers
where Orders.CustomerID = Customers.CustomerID )
--3-5
select * from orders
where 'usa' =
(select Country
from Customers
where Orders.CustomerID = Customers.CustomerID )
--4-1
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