MYSQL 查找出重复列值 - MS-SQL Server / 疑难问题
DB: MySql
Problem:
create table aaa(
id int primary key,
phone varchar(100),
name varchar(50)
)
insert into aaa values(000101,'111','jackie');
insert into aaa values(000102,'222','milk');
insert into aaa values(000103,'111','lucy');
insert into aaa values(000104,'111','mechelle');
insert into aaa values(000105,'222','tom');
insert into aaa values(000106,'333','roy');
查找出phone列有重复的值，即count(phone)>=2的值列出来
Required Result:
phone num
111 3
222 2
请高手解答，在线等，谢谢
SQL code:
select phone,
count(*)num
from aaa
group by phone
having count(*)>=2
SQL code:
create table aaa(
id int primary key,
phone varchar(100),
name varchar(50)
)
insert into aaa values(000101,'111','jackie');
insert into aaa values(000102,'222','milk');
insert into aaa values(000103,'111','lucy');
insert into aaa values(000104,'111','mechelle');
insert into aaa values(000105,'222','tom');
insert into aaa values(000106,'333','roy');
select phone,
count(*)num
from aaa
group by phone
having count(*)>=2
drop table aaa
/*
phone
相关问答：
String sqlCount="select count(*) from usertable where username='"+
userName+"'";这句话 什么意思啊！
这句话输出出来就是
select count(*) from usertable where username='你的变量 ......
1、是不是PHP中只能使用mysql_query("update user_aa set money=money2-".$bpanmm." where uid=".$userppp);更新数据？？？
2、PHP更新mysql_fetch_row($res)与mysql_fetch_array($res)中的数� ......
我是个新手，望高手解答
我现在已经安装了mysql，也有mysql的jdbc。但我怎么配置后，才能在MyEclipse里操作mysql呢？请高手说详细点
打开Myeclipse----window---open perspective---MyEclipse database explorer-- ......
有这样一条SQL
Select Get_Costtaxrate(col1), Get_Tcostvalue(col1) from a
其中Get_Costtaxrate、Get_Tcostvalue都是函数，这两个函数里面都是查找一个大表，Get_Tcostvalue还需要调用Get_C ......
php同时调用3个数据库中的一个表的信息（架设A.a.aid=B.b.bid=C.c.cid），请说明思路及书写部分代码
例如：
SELECT time, goodid from dbname1.time, dbname2.goods
是这个意思么？
SELECT time, goodid from ......
