为您找到与join用法归纳相关的共200个结果:
join有连接;加入;参与;和...一起等意思,那么你知道join的用法吗?下面跟着读文网小编一起来学习一下,希望对大家的学习有所帮助!
1. I know you will join me in wishing them Godspeed.
我知道你会同我一起祝愿他们诸事顺遂的。
2. Organisers expect up to 300,000 protesters to join the march.
组织者们预计会有多达30万名的抗议者参加这次游行。
3. Angela says she longs to join an amateur dramatics class.
安杰拉说她渴望参加业余戏剧班。
4. You have to join the party at grass-roots level.
你得参加基层党组织。
5. De Gaulle vetoed Britain's application to join the EEC.
戴高乐驳回了英国加入欧洲经济共同体的申请。
6. Make sure you join the queue inside the bank.
在银行里一定要排队。
7. When assembling the pie, wet the edges where the two crusts join.
捏合馅饼时,要弄湿两张饼皮粘连的地方。
8. I hope that everyone will be able to join in the fun.
我希望每个人都能够加入进来,玩得开心。
9. You will join us at our table, won't you?
你会过来和我们一起吃,对吗?
10. He got permission from his commanding officer to join me.
他得到指挥官的许可来与我会合。
11. There are any amount of clubs you could join.
有无数个俱乐部你可以加入。
12. His wife and children moved to join him in their new home.
他的妻子和孩子们搬进了他们的新家,和他一起生活。
13. Bob hurried to join him, and they rode home together.
鲍勃匆忙赶去和他会合,然后两人一起开车回家。
14. I'd like nothing better than to join you girls.
我最喜欢和你们女孩子在一起了。
15. You join a barrister for two six-month spells of practical experience.
你跟着一位出庭律师进行两期为时6个月的实习工作。
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以下是读文网小编整理的一些有关appear的用法,希望大家喜欢:
vi.
1.出现;显露
Gradually a smile appeared on her face.
她脸上渐渐地露出笑容.
2.演出;陈列;露面[Q]
The famous singer is appearing this fall at the Music Festival.
这位著名的歌手将在今秋的音乐节上演出.
3.出庭,到案[Q]
She will appear in court next Friday.
下星期五她将出庭.
4.似乎,看来好像[L][W][+to-v][+(that)]
He appeared to be talking to himself.
他似乎在自言自语.
It appears they are right.
看来他们是对的.
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数据库中join的用法的用法你知道吗?下面小编就跟你们详细介绍下数据库中join的用法的用法,希望对你们有用。
一、join的用法
内连接、外连接
示例用表:
雇员表(Employee)
LastNameDepartmentID
Rafferty31
Jones33
Steinberg33
Robinson34
Smith34
JasperNULL
部门表(Department)
DepartmentID部门
31销售部
33工程部
34书记
35市场部
1、内连接:相等连接、自然连接、交叉连接
1)、显式的内连接与隐式连接(inner join == join )
显示连接:SELECT * from employee join department on employee.DepartmentID = department.DepartmentID
等价于:
隐式连接:SELECT * from employee,department WHERE employee.DepartmentID = department.DepartmentID
注:当DepartmentID不匹配,就不会往结果表中生成任何数据。
2)、相等连接
提供了一种可选的简短符号去表达相等连接,它使用 USING 关键字。
SELECT * from employee join department using (DepartmentID)
注:与显式连接不同在于:DepartmentID只显示一列
3)、自然连接
比相等连接的进一步特例化。两表做自然连接时,两表中的所有名称相同的列都将被比较,这是隐式的。
自然连接得到的结果表中,两表中名称相同的列只出现一次.
select * from employee natural join department
注:在 Oracle 里用 JOIN USING 或 NATURAL JOIN 时,如果两表共有的列的名称前加上某表名作为前缀,
则会报编译错误: "ORA-25154: column part of USING clause cannot have qualifier"
或 "ORA-25155: column used in NATURAL join cannot have qualifier".
4)交叉连接(又称笛卡尔连接)
如果 A 和 B 是两个集合,它们的交叉连接就记为: A × B.
显示连接:
select * from employee cross join department
等价于
隐式连接:
select * from employee,department
2、外连接
并不要求连接的两表的每一条记录在对方表中都一条匹配的记录。
1)左连接(left outer join == left join)
若A表与B表左连接,A表对就的B表没有匹配,连接操作也会返回一条记录,对应值为NULL。
如:
Jaspernull null null
Jones3333工程部
Rafferty3131销售部
Robinson3434书记
Smith3434书记
Steinberg3333工程部
若A表对应B表中有多行,则左表会复制和右表匹配行一样的数量,并组合生成连接结果。
如:select * from department left join employee on employee.departmentId = department.departmentId
31销售部Rafferty31
33工程部Jones33
33工程部Steinberg33
34书记Robinson34
34书记Smith34
35市场部nullnull
2)、右连接(right outer join == right join)
与左连接同(略)
3)、全连接(full outer join ==full join)
是左右外连接的并集. 连接表包含被连接的表的所有记录, 如果缺少匹配的记录, 即以 NULL 填充。
select * from employee full outer join department on employee.departmentId = department.departmentId
注:一些数据库系统(如 MySQL)并不直接支持全连接, 但它们可以通过左右外连接的并集(参: union)来模拟实现.
和上面等价的实例:
select * from employee left join department on employee.departmentId = department.departmentId
union all
select * from employee right join department on employee.departmentId = department.departmentId
注:SQLite 不支持右连接。
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介词without的用法比较多样,下面读文网小编为大家归纳相关的用法:
without后接复合宾语的常用结构如下:
1.without+宾语+介词短语
We'd be better off without them as neighbors.要是没有这些邻居,我们就过得更愉快了.
I don't like sweet coffee; I like it better without sugar in it.我不喜欢加糖的咖啡,里边不加糖我更喜欢.
2.without+宾语+副词
I'd be lost without you here.没有你在这儿,我会一筹莫展.
I'm very near-sighted without my glasses on.我要是不戴眼镜十分近视.
3.without+宾语+动名词
Without anyone noticing,he slipped through the window.无人注意,他从窗户溜了出去.
They debated for hours without a decision being taken.他们争论了几个小时,也没作出决定.
4.without+宾语+过去分词
Without another word exchanged,they started off.没有再交谈一句,他们就出发了.
5.without+宾语+不定式
Without anyone to help,how can we go on?没有人帮忙,我们怎么能进行下去?
It was boring to sit there without anything to do.无所事事地坐在那里太无聊了.
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afraid是一个英文单词,形容词,翻译为“害怕的;恐怕;担心的”。那么你知道关于afraid这个单词更多的知识吗?下面小编整理了afraid的用法归纳总结_afraid的用法和例句,供大家参考。
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在英语学习中,Each的用法比较重要,也是考试中常考的考点,下面读文网小编为同学们归纳一下它的用法:
1.They each put forward a proposal.他们每人提出一条建议.
2.The workers are each of them hard-working.这些工人个个勤奋劳动.
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动名词是动词ing形式的一种,兼有动词 和名词特征的非限定动词 。它可以支配宾语,也能被副词 修饰。动名词有时态和语态的变化。以下是小编为大家整理的动名词用法的用法总结,希望能帮助大家更好地认识动名词用法,提高英语水平。
1 动名词作主语、宾语和表语
a. 动词后加动名词doing作宾语 V. + doing sth
admit 承认appreciate 感激,赞赏avoid 避免
complete 完成 consider 认为 delay 耽误 deny 否认 detest 讨厌 endure 忍受enjoy 喜欢escape 逃脱 prevent阻止
fancy 想象finish 完成 imagine 想象 mind 介意 miss 想念 postpone 推迟 practise 训练 recall 回忆 resent 讨厌resist 抵抗 resume 继续 risk 冒险
suggest 建议face 面对 include 包括stand 忍受understand 理解 forgive 宽恕 keep 继续
举例
(1)The squirrel was lucky that it just missed being caught.
(2)Would you mind turning down your radio a little, please?
b. 词组后接doing
admit to prefer…tobe used to lead todevote oneself to object tostick to busylook forward to(to为介词)
no good,no use,It's worth…, as well as,
can't help,It's no use /good be tired of
be fond of be capable of be afraid of
be proud of think of / about hold off
set about be successful in good attake up
put off keep on insist oncount on / upon
give upburst outprevent … from…
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以下是小编为大家整理的cause的用法,希望能帮助大家更好地掌握cause的用法,提高英语水平。
(1) cause表示“原因”时,是可数名词。
例句:They pegged it as the cause of failure.
他们认为这就是失败的原因。
(2) cause表示“理由”时,是不可数名词。
例句:She had just cause for anger. 她有正当的理由生气。
(3) cause表示“事业”或者“奋斗目标”时,是可数名词。
例句:He would immolate himself for their noble cause.
他愿意为他们的崇高事业牺牲自己。
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cause的用法总结相关
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下面是小编整理的一些关于介词for用法的总结, 希望能帮助大家更好地认识for这个单词,提高英语水平。
用法1:(表目的)为,为了:
They went out for a walk.
他们出去散步了。
What did you do that for?
你干吗这样做?
That’s what we’re here for.
这正是我们来的目的。
What’s she gone for this time?
她这次去干什么去了?
He was waiting for the bus.
他在等公共汽车。
(1) 有些后接双宾语的动词(如 buy, choose, cook, fetch, find, get, order, prepare, sing, spare 等),当双宾语易位时,通常用 for 来引出间接宾语,表示间接宾语为受益者。如:
She made her daughter a dress. / She made a dress for her daughter.
她为她女儿做了件连衣裙。
He cooked us some potatoes. / He cooked some potatoes for us.
他为我们煮了些土豆。
注意,类似下面这样的句子必须用 for:
He bought a new chair for the office.
他为办公室买了张新办公椅。
(2) 注意不要按汉语字面意思,在一些及物动词后误加介词 for:
他们决定在电视上为他们的新产品打广告。
误:They decided to advertise for their new product on TV.
正:They decided to advertise their new product on TV.
注:advertise 可用作及物或不及物动词,但含义不同:
advertise sth=为卖出某物而打广告;
advertise for sth=为寻找某物而打广告。
如:advertise for a job=登广告求职。由于受汉语“为”的影响,而此处误加了介词 for。
类似地,汉语中的“为人民服务”,说成英语是 serve the people,而不是 serve for the people,“为某人的死报仇”,说成英语是 avenge sb’s death,而不是 avenge for sb’s death,等等。#p#副标题#e#
用法3:(表用途)用于,用来。如:
Knives are used for cutting things.
小刀是用来切东西的。
This knife is for cutting bread.
这把小刀是用于切面包的。
It’s a machine for slicing bread.
这是切面包的机器。
The doctor gave her some medicine for her cold.
医生给了她一些感冒药。
用法4:为得到,为拿到,为取得。如:
He went home for his book.
他回家拿书。
He went to his friend for advice.
他去向朋友请教。
She often asked her parents for money.
她经常向父母要钱。
We all hope for success.
我们都盼望成功。
Are you coming in for some tea?
你要不要进来喝点茶?
用法5:给(某人),供(某人)用。如:
That’s for you.
这是给你的。
Here is a letter for you.
这是你的信。
Have you room for me there?
你那边能给我腾出点地方吗?
用法6:(表原因、理由)因为,由于。如:#p#副标题#e#
I am sorry for it.
对不起。
Thank you for coming to see me.
谢谢你来看我。
You can’t see the wood for the trees.
你只见树木,不见森林。
He is famous for his poems.
他因为他的诗出名。
He was sent to prison for robbery.
他因为抢劫而坐牢。
I couldn’t speak for laughing.
我笑得说不出话来。
He couldn’t sleep for joy.
他高兴得不能入睡。
For several reasons, I’d rather not meet her.
由于种种原因,我宁愿不见她。
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join有连接;加入;参与;和...一起等意思,那么你知道join的用法吗?下面跟着读文网小编一起来学习一下,希望对大家的学习有所帮助!
join in1 (v.+adv.)
join in2 (v.+prep.)
join on1 (v.+adv.)
join on2 (v.+prep.)
join to (v.+prep.)
join together (v.+adv.)
join up (v.+adv.)
join with (v.+prep.)
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以下是小编为大家整理的比较级形容词或副词 + than用法总结,希望能帮助大家更好地认识比较级句型,提高英语水平。
You are taller than I.
They lights in your room are as bright as those in mine.
注意:
1)要避免重复使用比较级。
(错) He is more cleverer than his brother.
(对) He is more clever than his brother.
(对) He is clever than his brother.
2)要避免将主语含在比较对象中。
(错) China is larger that any country in Asia.
(对) China is larger than any other countries in Asia.
3)要注意对应句型,遵循前后一致的原则。
The population of Shanghai is larger than that of Beijing.
It is easier to make a plan than to carry it out.
4)要注意冠词的使用,后有名词的时候,前面才有可能有名词。
比较:Which is large, Canada or Australia?
Which is the larger country, Canada or Australia?
She is taller than her two sisters.
She is the taller of the two sisters.
比较级形容词或副词 + than的用法归纳相关文章推荐:
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以下是小编为大家整理的系动词的用法总结,希望能帮助大家更好地认识系动词,提高英语水平。
系动词亦称联系动词(Link Verb),作为系动词,它本身有词义,但不能单独用作谓语,后边必须跟表语(亦称补语),构成系表结构说明主语的状况、性质、特征等情况。
说明:
有些系动词又是实义动词,该动词表达实义时,有词义,可单独作谓语,例如:
He fell ill yesterday.
他从梯子上摔下来。fell是实义动词,单独作谓语。
他昨天病了。(fell是系动词,后跟补足语,说明主语情况。)
He fell off the ladder.
感官系动词主要有feel, smell, sound, taste, 例如:
This kind of cloth feels very soft.
这种布手感很软。
This flower smells very sweet.
这朵花闻起来很香。
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以下读文网小编给大家带来once的用法总结,希望能对大家有所帮助:
1. once用作副词时,意为“曾经;一度;从前”.它是一个不确定的时间副词,其位置一般是在行为动词之前,系动词之后.
如:
Once he lived in America, but now he lives in England.
他曾经生活在美国,但现在他生活在英国.
2. once用作副词,也可意为“一次”的意思.两次是“twice”,三次是“three times”,四次是“four times”.
The old professor comes to see us once a week.
那个老教授一周来看我们一次.
3. 注意once用作副词时,在句中的位置不同表示的意思也不同,所以要特别注意.
如:
I once went to Shanghai. 我曾经去过上海.
I went to Shanghai once. 我去过上海一次.
4. once用作连词时,意为“一旦……就……”,用于连接时间状语从句,相当于as soon as.
如:
Once you start, you will never give up.
一旦你开始了,你就不要放弃.
5. once构成的一些短语的用法:
(1)once in a while(偶尔;间或)
We went to see our English teacher once in a while.
我们偶尔去看我们的英语老师.
(2)once again(再一次;又一次),相当于once more.
Read the passage once more. 把课文再读一遍.
(3)at once(立刻;马上)
Finish the task at once. 请立刻完成任务.
(4)once upon a time(很早以前;从前)
Once upon a time there was an old man named John Hill.
从前有一个名叫约翰.希尔的老人.
(5)all at once(突然),相当于suddenly.
All at once, they rushed out altogether.
突然,他们都一起冲出去了.
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下面是小编整理的一些关于rather than 用法归纳, 希望让大家更好地认识rather than 这个词组,提高英语水平。
rather than 是一个并列连词,用法比较复杂,现归纳如下:
(1) 连接两个名词或代词
He is an explorer rather than a sailor. 与其说他是一个海员,不如说他是一个探险者。
You rather than I are going to go camping. 是你而不是我要去要野营。
注意:rather than 连接两个名词或代词作主语时,谓语动词应与rather than 前面的名词或代词在人称和数上保持一致。
(2) 连接两个形容词
The sweater she bought was beautiful rather than cheap. 与其说她买的这件羊毛衫便宜不如说它漂亮。
(3) 连接两个介词(短语)或动名词
We will have the meeting in the classroom rather than in the great hall. 我们是在教室里开会,不是在大厅里。
She enjoys singing rather than dancing. 她喜欢唱歌,而不喜欢跳舞。
(4) 连接两个分句
We should help him rather than he should help us. 是我们应该帮助他而不是他应该帮助我们。
(5) 连接两个不定式
I decided to write rather than (to) telephone. 我决定写信而不打电话。
注意:rather than 后接不定式时,不定式可以带to,也可以不带to, 如上句。但rather than位于句首时,则只能接不带to 的不定式。如:Rather than allow the vegetables to go bad, he sold them at half price. 他唯恐蔬菜烂掉,把它们以半价卖掉了。
(6) 连接两个动词
He ran rather than walked. 他是跑来的,而不是走来的。
注意:这里rather than 后用了walked,而没有用walk,表示客观事实,而不是主观愿望。如果换成walk,则作“宁愿……而不愿 ……”解。
would rather的用法
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以下是小编为大家整理的分词的用法的用法总结,希望能帮助大家更好地认识分词,提高英语水平。
分词作定语
分词前置
We can see the rising sun. 我们可以看到东升的旭日
He is a retired worker. 他是位退休的工人
分词后置 (i分词词组;ii 个别分词如given, left; iii 修饰不定代词 something等)
There was a girl sitting there.有个女孩坐在那里
There is nothing interesting. 没有有趣的东西
This is the question given. 这是所给的问题
过去分词作定语
与其修饰的词是被动关系,相当于一个被动语态的定语从句。
Most of the people invited to the party were famous scientists.
Most of the artists invited to the party were from South Africa.
典型例题
1)What's the language ____ in Germany?
A. speakingB. spoken C. be spokenD. to speak
答案B. 主语language与谓语动词之间有被动的含义。
2) The first textbook ___ for teaching English as a foreign language came out in the 16th century.
A. have written B. to be written C. being written D. written
答案D. 书与写作是被动关系,应用过去分词做定语表被动,相当于定语从句 which is written
2)What's the language ____ in Germany?
A. speakingB. spoken C. be spokenD. to speak
答案B. 主语language与谓语动词之间有被动的含义。
spoken是动词speak的过去分词形式,在句中作定语,修饰主语language, spoken 与 language有被动关系。该句可以理解为:
What's the language (which is) spoken in German?
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以下是小编为大家整理的put on , wear, dress,in英语单词的用法归纳,希望能帮助大家提高英语水平。
“穿戴”动作put on, 状态wear 已穿上。
穿鞋袜,着服装,眼镜、手套、帽戴上。
wear 用法还要广, 戴表、首饰、花、徽章。
dress接人做宾语, in 后颜色或衣裳。
根据句意,用put on , wear, dress,in的适当形式填空,使句子完整、通顺。
1. He often_______a pair of sunglasses.
2. Who is the boy_______a blue shirt?
3. It is so cold outside._______your warm coat when you go out.
4. He could_______himself when he was five years old.
5.Look! Lucy is_______a red skirt and a pair of pink shoes.
Keys:
1. wears 2. in 3. Put on 4. dress 5. wearing
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put on , wear, dress,in的用法相关
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下面是读文网小编归纳的一些关于英语介词on的用法,以供大家学习参考。
注:口诀中的“着”是指着火,罢指罢工,偷指偷偷地,公指出差、办公事;假指休假,准指准时。
例:The house next to mine was on fire. 我邻居的房子着火了。
The workers of the railway station were on strike. 铁路工人罢工了。
Grapes and big water melons from Sinkiang are on sale on a large sale. 新疆葡萄和西瓜大量上市了。
do something on the sly (quiet). 秘密地(暗地里,偷偷地)做某事。
I've come here on business. 我是有公事来的。
They went to Bern on a mission. 他们到伯尔尼去执行一项使命。
They has been away on a long trip. 他们出去做一次长途旅行。
I'll go home on leave next month. 下月我将休假回家。
I went on business to Shanghai. I did not take leave. 我是公出去上海的,不是不告面别。
She came to see you on purpose. 她是专程来看你的。
He came here on purpose to discuss it with you. 他到这来是要与你讨论这件事的。
This lunch is on me.
"No. let's go Dutch."
“这顿午饭我付钱。”
“不,还是各付各的。”
On the contrary, it was very easy to understand. 相反,这事儿很容易理解。
P1ease come on time. (on schedule). 请准时来。
注:in time是“及时”的意思。
The train arrived on schedule. 火车准时到达。
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以下是小编为大家整理的go ahead 的用法总结,希望能帮助大家更好地认识go ahead这个词组,提高英语水平。
go ahead 是口语中一个十分有用的表达。归纳起来,它在中学英语中有以下3种用法。
其意为:你先走一步,你先请。如:
You go ahead. I’ll join you soon. 你们先开始,我一会儿就来(和你们一块儿干)。
You go ahead and tell him that we’re coming. 你先走一步,告诉他我们就来。
Go ahead, please. 你先请(劝别人先吃或先走等的客套说法)。
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go ahead的用法总结相关
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