資料庫建立
create database test120171;
gouse test120171
gocreate table department(
deptno int primary key not null,
deptname varchar(20) not null)
gocreate table pgroup(
groupno int primary key,
groupname varchar(20) not null,
deptno int not null,
month int ,
number int not null check(number<80),
foreign key (deptno) references department(deptno))
create table patient(
pid int primary key,
pname varchar(20) not null,
pdate date not null,
groupno int,
foreign key (groupno) references pgroup(groupno))
insert into patient values('880101','李一','1980/6/1','11')
insert into patient values('880102','王二','1978/2/3','15')
insert into patient values('880103','張三','1969/11/2','13')
insert into patient values('880104','劉四','1975/7/20','13')
insert into patient values('880105','陳五','1986/5/16','14')
insert into patient values('880106','楊六','1998/4/23','13')
insert into patient values('880107','趙七','2000/3/1','12')
insert into patient values('880108','周八','1992/7/5','11')
insert into pgroup values('11','心內科','111','3','32')
insert into pgroup values('12','呼吸內科','111','4','45')
insert into pgroup values('13','中醫保健科','333','3','68')
insert into pgroup values('14','骨科','222','4','28')
insert into pgroup values('15','心外科','222','4','56')
insert into pgroup values('16','心內科','111','3','32')
insert into department values('111','內科')
insert into department values('222','外科')
insert into department values('333','中醫科')
goselect department.deptname,pgroup.groupname,patient.pname
from department,pgroup,patient
where department.deptno=pgroup.deptno and pgroup.groupno=patient.groupno
group by department.deptname,pgroup.groupname,patient.pname
order by department.deptname desc,pgroup.groupname asc,patient.pname desc
goselect department.deptname,sum(pgroup.number)人數
from department,pgroup
where department.deptno=pgroup.deptno
group by department.deptname
goselect pgroup.month,sum(number)當月人數
from pgroup
group by pgroup.month
goselect min(number)最少人數,max(number)最多人數
from pgroup
dbhelpersql.cs
using system;
using system.collections.generic;
using system.linq;
using system.text;
using system.threading.tasks;
using system.data.sqlclient;
using system.data;
using system.windows.forms;
namespace test
else
}catch(exception ex)
}public static datatable tableselect(string sql,sqlparameter para = null)
catch(exception ex)}}
}
using system;
using system.collections.generic;
using system.linq;
using system.threading.tasks;
using system.windows.forms;
namespace test
catch(exception ex)
dbhelpersql.conn.close();}}
}
using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.linq;
using system.text;
using system.threading.tasks;
using system.windows.forms;
using system.data.sqlclient;
namespace test
private void button1_click(object sender, eventargs e)
else
sql += string.format(" and department.deptname=''", textbox1.text);
}if (checkboxgroupname.checked)
else
sql += string.format(" and pgroup.groupname=''", textbox2.text);
}if (checkboxpname.checked)
else
sql += string.format(" and patient.pname=''", textbox3.text);
}sql+=string.format(@" group by department.deptname,pgroup.groupname,patient.pname
order by department.deptname desc, pgroup.groupname asc, patient.pname desc");
datagridview1.datasource = dbhelpersql.tableselect(sql);}}
}
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