《MysqL应用最全的mySQL查询语句整理》要点：
本文介绍了MysqL应用最全的mySQL查询语句整理，希望对您有用。如果有疑问，可以联系我们。
MysqL入门select * from pet
MysqL入门-- 列出指定的列
MysqL入门select name,owner form pet
MysqL入门-- 直接进行算术运算,对字段起别名
MysqL入门select sin(1+2) as sin
MysqL入门--where 条件
MysqL入门select * from pet where (birth>'1980' and species='dog') or species='bird'
MysqL入门-- 对null 的条件
MysqL入门select * from pet where sex is not null
MysqL入门-- 所有名字第四位是n 的宠物信息是
MysqL入门select * from pet where owner like '___n%'
MysqL入门-- 所有主人名叫gwen 或benny 的宠物
MysqL入门select * from pet where owner in ('gwen','benny')
MysqL入门-- 查询出生日期在90 年代是宠物,相当与 >= and <=
MysqL入门select * from pet where birth between '1990' and '1999'
MysqL入门-- 按主人姓名排序,相同的按宠物姓名倒序排列
MysqL入门select * from pet order by owner,name desc
MysqL入门select * from pet where sex='m' order by birth desc
MysqL入门--char_lenngth() 返回的字符的长度,length() 返回字节长度
MysqL入门SELECT owner,length(owner),char_length(owner) FROM pet p;
MysqL入门-- 列出养有宠物狗的人名
MysqL入门select distinct owner from pet where species='dog'
MysqL入门-- 用两种方法查询出所有狗和猫的名字、出生年份、出生月份
MysqL入门select name,left(birth,4) as year,mid(birth,6,2) as month from pet
MysqL入门where species='dog' or species='cat'
MysqL入门select name,year(birth) as year,month(birth) as month from pet
MysqL入门where species in('dog','cat')
MysqL入门-- 查询所有名字中存在字母'e' 的人,将他们养的宠物按类别、年龄排序
MysqL入门select name,species,birth
MysqL入门from pet
MysqL入门where owner like '%e%'
MysqL入门order by species,birth desc
MysqL入门select round(2.345,2),truncate(2.345,mod(323,5)
MysqL入门select now(),curdate(),curtime()
MysqL入门select adddate('2007-02-02',interval 31 day)
MysqL入门-- 求出所有宠物的年龄
MysqL入门select name,birth,
MysqL入门truncate(datediff(now(),birth)/365,0) as age1,
MysqL入门year(now())-year(birth) - (dayofyear(birth)>dayofyear(now())) as age2
MysqL入门from pet
MysqL入门select min(birth),max(birth),avg(birth),count(*),count(sex),
MysqL入门sum(birth)
MysqL入门from pet
MysqL入门-- 每种宠物各有几只
MysqL入门select species,count(*)
MysqL入门from pet
MysqL入门group by species
MysqL入门select * from pet where birth =
MysqL入门 (select max(birth) from pet)
MysqL入门-- 每年各出生了几只宠物
MysqL入门select year(birth),count(*) from pet group by year(birth)
MysqL入门-- 鸟和猫的性别比例
MysqL入门select species,sex,count(*)
MysqL入门from pet
MysqL入门where species in ('cat','bird')
MysqL入门group by species,sex
MysqL入门-- 各种宠物年龄的和
MysqL入门select species,sum(truncate(datediff(now(),0)) as SumAge
MysqL入门from pet
MysqL入门group by species
MysqL入门select species,count(*) as c
MysqL入门from pet
MysqL入门group by species
MysqL入门having c>=2
MysqL入门-- 基本双表关联
MysqL入门select a.name,a.species,a.sex,b.date,b.type,b.remark
MysqL入门from pet a,event b
MysqL入门where a.name = b.name
MysqL入门select a.name,
MysqL入门truncate(datediff(b.date,a.birth)/365,0) as age
MysqL入门from pet a,event b
MysqL入门where a.name = b.name and b.type='litter'
MysqL入门--90 年代出生的狗的事件列表
MysqL入门select a.name,date,type,remark
MysqL入门from pet a,event b
MysqL入门where a.name=b.name and birth between '1990' and '1999'
MysqL入门and species='dog'
MysqL入门-- 活着的宠物按发生的事件类型分组,看各种事件发生的次数
MysqL入门select type,count(*)
MysqL入门from pet a,event b
MysqL入门where a.name=b.name and a.death is null
MysqL入门group by type
MysqL入门select a.name,event b
MysqL入门where a.name = b.name
MysqL入门group by b.name
MysqL入门having count(*)>=2
MysqL入门-- 列出发生了两件事情的宠物的事件记录信息
MysqL入门select a.name,remark,b.species,b.sex,b.owner
MysqL入门from event a,pet b
MysqL入门where a.name=b.name and
MysqL入门 b.name in
MysqL入门 (
MysqL入门select name
MysqL入门from event
MysqL入门group by name
MysqL入门having count(*)=2
MysqL入门 )
MysqL入门-- 插入语句
MysqL入门insert into pet (name,birth)
MysqL入门values ('KKK','snake','2007-01-01');
MysqL入门insert into pet
MysqL入门values ('KK','Diane','cat','f',null,null);
MysqL入门insert into pet set name='k',owner='Benny'
MysqL入门-- 更新语句
MysqL入门update pet set species='snake',sex='f',birth=now()
MysqL入门where name='k'
MysqL入门-- 将事件表中生日的日期,更新到pet 表中相应宠物的birth 字段
MysqL入门update pet a
MysqL入门set birth = (
MysqL入门 select date
MysqL入门 from event b
MysqL入门 where a.name=b.name and b.type='birthday'
MysqL入门 )
MysqL入门where a.name in (
MysqL入门 select name
MysqL入门 from event
MysqL入门 where type='birthday'
MysqL入门 )
MysqL入门delete from pet where name like 'k%'
MysqL入门SELECT * FROM `test` WHERE 1 //简单查询
SELECT id,uid FROM newdb.`test` WHERE 1 //查询ID、UID等字段
SELECT remark as r FROM `test` WHERE 1 //别名查询
SELECT * FROM `test` WHERE id=1,3 //条件查询,相等
SELECT * FROM `test` WHERE id<>2,3 //条件按查,不相等
SELECT * FROM `test` WHERE id in (1,2,4) //in查询,即查询ID为1,4的数据
SELECT * FROM `test` WHERE not in (2,3) //in查询,查询ID不是2,3的数据
SELECT * FROM `test` WHERE `uid` like '%王%' //like模糊查询,%*%前后匹配
SELECT * FROM `test` WHERE id BETWEEN 1 and 3 //条件查询,中间数据
SELECT * FROM `test` WHERE id NOT BETWEEN 1and3 //条件查询
SELECT * FROM `test` WHERE id=1 and `remark`='学生' //多个条件
SELECT * FROM `test` group by `remark` //查询排序
SELECT * FROM `test` order by `regdate` ASC //order by升序排序,放到limit之前
SELECT * FROM `test` order by `regdate` ASC,id DESC //order by按照注册时间升序,ID降序
ASC 升序、DESC降序.
MysqL入门SELECT * FROM `test` limit 0,3 //数据条数限制,输出三条
SELECT count(*) FROM `test` WHERE 1 //统计查询,可以查询单个统计,例如count(name)
SELECT max(id) FROM `test` WHERE 1 //统计ID最大值是多少
以下三个和以上max用法类似
MIN(*)最小值函数
AVG(*)平均值函数
SUM(*)累计值函数
MysqL入门基本插入语句：
MysqL入门insert into test (`id`,`uid`,`regdate`,`remark`) values ('','PHP100','2008-07-26','工人') //ID自增,
insert into test (`id`,'PHP100','now()','工人')
insert into test values ('','PHP200','工人') //简便写法,但不提倡
MysqL入门更新语句：
MysqL入门update test set uid='PHP200' where id=6 //set 后是要改后的内容.where 后是更改位置
MysqL入门Delete from dbname.`test` where id=3