Left

Left

英語單詞,leave的過去式和過去分詞。在left語句中,功能是得到字元串左部指定個數的字元。

基本信息

Left()

Left 英音:[left]美音:[lɛft]

left()left()

功能得到字元串左部指定個數的字元。

語法Left (string,n)

參數string:string類型,指定要提取子串的字元串n:long類型,指定子串長度返回值String。函式執行成功時返回string字元串左邊n個字元,發生錯誤時返回空字元串("")。如果任何參數的值為NULL,Left()函式返回NULL。如果n的值大於string字元串的長度,那么Left()函式返回整個string字元串,但並不增加其它字元。

例如,在學生課表course中,分別有cno,cname,cpno,credit四列。其中有一項記錄為:1,資料庫,5,4。在SQL分析器中輸入:

INSERT course

(cno,cname,cpno,credit)

select'0001'+left(cno,1),cname,cpno,credit

from course

go

此時course表中會多出一條記錄:00011,資料庫,5,4。

Excel函式

LEFT

根據所指定的字元數,LEFT 返回文本字元串中第一個字元或前幾個字元。

LEFTB 基於所指定的位元組數返回文本字元串中的第一個或前幾個字元。

要點 函式 LEFT 面向使用單位元組字元集 (SBCS) 的語言,而函式 LEFTB 面向使用雙位元組字元集 (DBCS) 的語言。您計算機上的默認語言設定對返回值的影響方式如下:

無論默認語言設定如何,函式 LEFT 始終將每個字元(不管是單位元組還是雙位元組)按 1 計數。

當啟用支持 DBCS 的語言的編輯並將其設定為默認語言時,函式 LEFTB 會將每個雙位元組字元按 2 計數,否則,函式 LEFTB 會將每個字元按 1 計數。

支持 DBCS 的語言包括日語、中文(簡體)、中文(繁體)以及朝鮮語。

語法

LEFT(text,num_chars)

LEFTB(text,num_bytes)

Text 是包含要提取的字元的文本字元串。

Num_chars 指定要由 LEFT 提取的字元的數量。

Num_chars 必須大於或等於零。

如果 num_chars 大於文本長度,則 LEFT 返回全部文本。

如果省略 num_chars,則假設其值為 1。

Num_bytes 按位元組指定要由 LEFTB 提取的字元的數量。

英語單詞

基本釋義

(leave的過去式和過去分詞)

left

形容詞 a.

左方的;左側的[Z][B]

Some people write with their left hand.

有些人用左手寫字。

⒉(常大寫)(政治上)左派的;左翼的

副詞 ad.

⒈在左邊;向左

Walk three blocks and then turn left at the corner.

走過三個街區然後向左轉。

名詞 n.

⒈左,左邊[the S]

John was seated on her left.

約翰坐在她的左邊。

⒉(常大寫)左派;激進分子們[the S][G]

The left oppose the tax increase.

左翼人士反對增稅。

⒊(拳擊中的)左拳[C]

動詞 v.

⒈造成

When this irregular breath hits your voice box,you're left with a big hiccup.

當不規則的氣流撞擊你的喉嚨,就會造成你打一個大大地嗝。

網路釋義

Left

⒈左;左側;左視圖

3DMAX中英文對照(3dmax命令)大全...

Left左;左側;左視圖

⒉跑動方向鍵左

按鍵翻譯(鎖定防守篇) - 〖NBA2K9...

Left 跑動方向鍵左

left

⒈左後衛

體育英語《體育英語辭彙和術語》 - 英語學...

left 左後衛

有道翻譯

left[left] vt.

leave的變形

left [left] adj.

⒈左的;左邊的;左側的;左手的;左半身的;左方的

⒉左岸的

⒊左翼的;左派的;“左”傾的;急進的;激進的

n.

⒈左邊;左側;左部;[ the left]左方

⒉左側的東西

⒊向左轉;左轉彎

⒋[ the left] 【政治】左派;激進派議員(在歐洲立法機關中常坐在議長席左側,故名)

⒌【軍事】左翼

⒍[美國英語](船的)左舷

adv.

向左邊;在左邊

left [left] leave的過去式和過去分詞

leave [li:v] vt.

1.離開,離去;從…走開;脫離:例:He has left Beijing for London.

他已經離開北京到倫敦去了。

He left his hometown and looked for a job in town.

他離開家鄉到城裡找工作。

2. 留;剩下:例:She left some of the food for her husband.

她給丈夫留了一些吃的。

3. 留下;將…留下:例:The secretary asked him to leave his telephone number.

秘書要他把電話號碼留下來。

4. (死後或離開後)把…留給;遺贈給:例:His uncle left $10 000 in the will.

他舅舅在遺囑中留下10 000美元。

5. 死後留下;遺留下:例:He left a widow and two children.

他死後撇下寡妻和兩個孩子。

6. 留下;丟下;忘帶:例:I left my dictionary in the library.

我把詞典丟在圖書館裡了。

7. 委託;交託;交由…照管:例:You'd better leave this up to me.

你最好把這件事交給我辦吧。

He left his son to his sister.

他把兒子交由他姐姐照管。

8. 擱置;不管;忽略;暫不解決:例:We'll leave this item till the next meeting.

我們把這個議題放到下次會議討論。

9. 辭去(工作);捨棄;停止;拒絕:例:take it or leave it

取捨悉聽尊便

He left medicine for law.

他放棄醫學改學法律。

10. 剩餘;剩下:例:3 from 7 leaves 4.

7減3餘4。

15 minus 5 leaves 10.

15減5得10。

11. 使…處於(某種狀態);聽任;讓:例:Leave the windows open. It's so stuffy here.

讓窗子開著,這兒太悶熱了。

The earthquake left them homeless.

地震讓他們無家可歸。

12. [方言、俚語]讓;允許:例:Leave them go.

讓他們走。

vi.

離去,離開;出發,動身:例:When we got to the railway station,the train had left.

我們到火車站時,火車已經開走了。

He leaves for work at 7 every morning.

他每天早上7點鐘離家去上班。

變形:

vt.leftleaving

leftn.

⒈location near or direction toward the left side; i.e. the side to the north when a person or object faces eastshe stood on the left

⒉those who support varying degrees of social or political or economic change designed to promote the public welfare

⒊the hand that is on the left side of the bodyjab with your left

⒋the piece of ground in the outfield on the catcher's leftthe batter flied out to left

⒌a turn toward the side of the body that is on the north when the person is facing easttake a left at the corner

adj.

⒈being or located on or directed toward the side of the body to the west when facing northmy left hand left center field the left bank of a river is bank on your left side when you are facing downstream

⒉not used upleftover meatloaf she had a little money left over so she went to a movie some odd dollars left

⒊intended for the left handI rarely lose a left-hand glove

⒋of or belonging to the political or intellectual left

adv.

toward or on the left; also used figurativelyhe looked right and left the political party has moved left

句型

例句展示

⒈To live in the hearts ofthose left behind is not to die

活在後人心,雖死而猶生

⒉Mr. Brown racked his Braintrying to remember where he left thewallet.

布朗先生拚命思索,想記起他把錢包放在什麼地方了

⒊I was left cooling my heels out side your home for twohours

我在你家門外足足等了兩個小時

⒋They rolled up the moneyand left through the Back gate in a tearinghurry.

他們十分倉促地捲起錢就從後門逃走了

⒌I believe Mary was left to the tender mercies of her stepmother.

我相信瑪麗受到了後母的虐待

⒍Who would like tofeel left out at such a function?

在這們的場合上有誰會願意受到冷落呢?

⒎I let out a parting shotand left

我說了一句氣話就離開了

⒏Why should I be left holding the Baby alone?

為什麼把這個苦差事留給我一個人乾

⒐He had nothing left to desire in life

他的生活已經是完美無缺了

⒑Let not thy left hand know what thy right hand doeth.

不要讓你的左手知道你的右手所做的事(行善不欲人知)。

⒒George took all the moneyaway and left hiscompanions high and dry,with nothing to Buy the tickets.

喬治帶走了所有的錢,把他的同事拋棄了,連買車票的錢也沒有

⒓"When someone foundthat the police were coming,he took to his heels and left the others in the lurch"

當有人以現警察來了的時候,他拔腿就跑而對其他的人卻棄之不管了

⒔"Industry if fortune'sright hand,and frugality her left"

勤勉是幸福的右手,節儉是幸福的左手

⒕"When I fond that astranger began to make a pass at me,I gave him a stern look and left"

當一個陌生男子開始向我調情時,我瞪了他一眼就離開了

⒖"From the doorway,hegave a parting shot to his mother andleft"

站在門口,他衝著母親說了一句氣話然後就走了

⒗He left his gun outside so as not to frighten hiswife.

他把槍放在外面以免驚嚇他的妻子。

⒘Go down the first turningon the left until you come to a tallbuilding.

在第一條橫馬路左拐彎,然後一直走到一座高樓處。

⒙Differences of opinionamong committee members cannot be resolved and are left unresolved for a long time

委員間意見分歧的事亦無由解決,並且聽任這些分歧長期地不加解決。

⒚Turn fight and you will seethe supermarket on your left.

向右拐你就會看到那個超級市場在你左邊。

⒛I left my belongings with this grand-motherlyfigure and entered into this magnificent hall of learning.

我把我的東西留給那祖母般的工作人員,進入了那宏大的學習之廳。

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