--存儲過程 函數 觸發器 複習
--1.輸入任意支行，統計其總客戶（存款客戶和貸款客戶）的個數，這裏要單獨寫
--create function customer_count4(@branch_name nvarchar(30))
--returns integer
-- begin
-- declare @a int
-- declare @b innt
-- declare @c int
-- set @a=(select count(*) from account join depositor on(account.account_number=depositor.account_number) where branch_name=@branch_name)
-- set @b=(select count(*) from loan where branch_name=@branch_name)
-- set @c=@a+@b
-- return @c
--end
--select dbo.customer_count4('ABC') as customer_count
--drop function customer_count1
--drop procedure cun_loan_count
--法二 存儲過程
--create procedure customer_count2(@branch_name nvarchar(30),@customer_count int output)
--as begin
-- declare @a int
-- declare @b int
-- set @a=(select count(*) from account join depositor on(account.account_number=depositor.account_number) where branch_name=@branch_name)
-- set @b=(select count(*) from loan where branch_name=@branch_name)
-- set @customer_count=@a+@b
-- end
-- declare @c_count int
-- execute customer_count2 @branch_name='abc',@customer_count=@c_count output
-- print @c_count
--2、輸入任意支行，返回一個zhi行的貸款總額，存款總額，總資產
--create procedure money_count(@branch_name nvarchar(30),@amount_count int output,@balance_count int output,@assets_count int output)
--as begin
-- set @amount_count=(select sum(amount) from loan where branch_name=@branch_name)
-- set @balance_count=(select sum(balance) from account where branch_name=@branch_name)
-- set @assets_count=(select assets from branch where branch_name=@branch_name)
--end
--declare @am int
--declare @ba int
--declare @as int
--execute money_count @branch_name='abc',@amount_count=@am output,@balance_count=@ba output,@assets_count=@as output
--print @am
--print @ba
--print @as
--3.輸入任意支行，返回存款客戶，客戶名稱及居住地點
--drop function customer_information
--create function customer_information(@branch_name nvarchar(30))
--returns table
--as return(
-- select c.customer_name,c.customer_street,c.customer_city
-- from account as a,depositor as d,customer as c
-- where branch_name=@branch_name
--)
--select distinct * from customer_information('abc')
--觸發器複習
--1.一個用於跟蹤哪個用戶、何時間更新了Account表的balance，
--drop table table2
--create table table10(
-- account_number nvarchar(30),
-- time datetime,
-- username nvarchar(30),
-- o_balance float,
-- i_balance float
--)
create trigger trigger0 on account after update
as
begin
if(UPDATE(balance))
begin
declare @account_number nvarchar(30)
declare @o_balance float
declare @i_balance float
declare aaa cursor for select i.account_number, i.balance,d.balance from inserted as i,deleted as d
open aaa
fetch next from aaa into @account_number,@o_balance,@i_balance
while @@FETCH_STATUS=0
begin
insert into table10 values(@account_number,GETDATE(),USER_NAME(),@o_balance,@i_balance)
fetch next from aaa into @account_number,@o_balance,@i_balance
end
close aaa
deallocate aaa
end
end
update account set balance=1000 where account_number='1'
select * from table10
--2.另一個用於跟蹤哪個用戶、何時間更新了loan表的amount，
--3.當Branch表的city爲NULL時，一律寫成“presently uncertain”
--drop trigger trigger1
--create trigger trigger2 on branch after update
--as
--begin
-- if(update(branch_city))
-- begin
-- declare @branch_name nvarchar(30)
-- declare @city nvarchar(30)
-- declare aaa cursor for select branch_city,branch_name from inserted
-- open aaa
-- fetch next from aaa into @city,@branch_name
-- while @@fetch_status=0
-- begin
-- if(@city is null)
-- begin
-- update branch set branch_city='presently uncertain' where branch_name=@branch_name
-- fetch next from aaa into @city,@branch_name
-- end
-- else
-- begin
-- update branch set branch_city=@city where branch_name=@branch_name
-- fetch next from aaa into @city,@branch_name
-- end
-- end
-- close aaa
-- deallocate aaa
-- end
--end
--insert into branch values('chen' ,'yantai',1000)
--update branch set branch_city=null where branch_name='abc'
--select * from branch