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mysql 怎么查询一个字段对应的多个值

in(v1,v2..vn) ,符合v1,v2,,,vn才能被查出 IN关键字可以判断某个字段的值是否在指定的集合中。如果字段的值在集合中,则满足查询条件,该纪录将被查询出来。如果不在集合中,则不满足查询条件。其语法规则如下:[ NOT ] IN ( 元素1, 元素2, …, ...

--第一种写法select * from 表名 where devEUI='3430363057376506' or devEUI='3430363064378607'--第二种写法select * from 表名 where devEUI in('3430363057376506','3430363064378607')

select * from tablename where ziduan1 =1 or ziduan2 = 1 你可以到w3cschool里面看看这些语句什么的http://www.w3school.com.cn/sql/sql_and_or.asp

select * from otim where sheetid in(1,2,3) 结构化查询语言(Structured Query Language)简称SQL(发音:/ˈes kjuː ˈel/ "S-Q-L"),是一种特殊目的的编程语言,是一种数据库查询和程序设计语言,用于存取数据以及查询、更新和管...

加个count就可以了,语句如下 select count(distinct age) from table

SELECT * FROM `ecs_volume_price` WHERE `goods_id` = '73' AND `volume_number` not in(4000,8000,12000,16000)

1、一般查询语句:SELECT `lcontent` FROM `caiji_ym_liuyan` 查询数据: 2、有些时候需要查询某个字段的长度为多少时候才显示数据: SQL语句:SELECT `lcontent` FROM `caiji_ym_liuyan` where length(lcontent)

请参见下列MySQL实验: -- 生成orderproduct表 create table orderproduct(orderid char(11) primary key,productid varchar(255)); -- product表 create table product(productid varchar(10) primary key,productname varchar(50)); -- 向订单...

SELECT m.aid,m.b1id,n.bcon,m.b2id as b2id,o.bcon as b2con, m.b3id as b3id,p.bcon as b3con FROM `test` as m INNER JOIN test1 as n on m.b1id=n.bid INNER JOIN test1 as o on m.b2id=o.bid INNER JOIN test1 as p on m.b3id=p.bid; 结果:

MySQL中的SQL语句可以这样写: SELECT *FROM newtableWHERE newimage1 = 'xxx' OR newimage2 = 'xxx' OR newimage3 = 'xxx'; Java代码: rs=st.executeQuery("SELECT * FROM newtable WHERE newimage1 = '" + newsid + "' OR newimage2 = '" + n...

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