oracle inner join用法

Oracle join

1. 条件连接(join) 2. T1 { [INNER] | { LEFT | RIGHT | FULL } [OUTER] } JOIN T2 ON boolean_expression 3. T1 { [INNER] | { LEFT | RIGHT | FULL } [OUTER] } JOIN T2 USING ( join column list ) 4. T1 NATURAL { [INNER] | { LEFT | RIGHT | FULL } [OUTER] } JOIN T2 5. INNER 和 OUTER 对所有连接（join） 类型都是可选的．INNER 是缺省； LEFT，RIGHT，和 FULL 隐含外连接． 6. 7. 连接条件在ON或USING子句里声明， 或者用关键字NATURAL隐含地声明．连接条件判断来自两个源表 中的那些行是\匹配\的，这些我们将在下面详细解释． 8. 9. ON子句是最常见的连接条件的类型∶它接收一个和WHERE子句里用的一样的 布尔值表达式．如果两个分别来自T1和T2的行在ON表达式上运算的 结果为真，那么它们就算

Oracle join

1. 条件连接(join) 2. T1 { [INNER] | { LEFT | RIGHT | FULL } [OUTER] } JOIN T2 ON boolean_expression 3. T1 { [INNER] | { LEFT | RIGHT | FULL } [OUTER] } JOIN T2 USING ( join column list ) 4. T1 NATURAL { [INNER] | { LEFT | RIGHT | FULL } [OUTER] } JOIN T2 5. INNER 和 OUTER 对所有连接（join） 类型都是可选的．INNER 是缺省； LEFT，RIGHT，和 FULL 隐含外连接． 6. 7. 连接条件在ON或USING子句里声明， 或者用关键字NATURAL隐含地声明．连接条件判断来自两个源表 中的那些行是\匹配\的，这些我们将在下面详细解释． 8. 9. ON子句是最常见的连接条件的类型∶它接收一个和WHERE子句里用的一样的 布尔值表达式．如果两个分别来自T1和T2的行在ON表达式上运算的 结果为真，那么它们就算

come as you are

区分join, join in, take part in

2. join v. become a member of (sth.)参加；指加入某组织或团体，成为其成员之一。如参军、入团、入党。

He joined the Party five years ago. 五年前他入了党。

We’ll have to join the nation-wide strike too.

我们也得参与这次全国性的罢工。

join in指参加比赛或活动等，常用于口语，此时可与join互换。

Why didn’t you join (in) the talk last night?你为什么昨晚不参加座谈？

take part in指参加会议或群众性活动等，重在说明句子主语参加该项活动并在其中发挥作用。

We often take part in physical labor. 我们经常参加体力劳动。

join与take part in的用法：都可以表示“参加”的意思，但用法有所不同：

（1）join指加入某组织或团体，成为其成员之一。如参军，入团，入党等。如：

My wish is join the army. 我的愿望是参军。

When did h

Oracle分析函数与分组关键字的用法

以下是我以前工作中做报表常用的几个函数，在此分享一下，希望对大家有帮助。

(一)分析函数 ?row_number

Purpose

ROW_NUMBER is an analytic function. It assigns a unique number to each row to which it is applied (either each row in the partition or each row returned by the query), in the ordered sequence of rows specified in the order_by_clause, beginning with 1.

You cannot use ROW_NUMBER or any other analytic function for expr. That is, you can use other built-in function expressions for expr, but you cannot nest analytic functions.

按部门分组后根据工资排序，序号rn

Oracle分析函数与分组关键字的用法

以下是我以前工作中做报表常用的几个函数，在此分享一下，希望对大家有帮助。

(一)分析函数 ?row_number

Purpose

ROW_NUMBER is an analytic function. It assigns a unique number to each row to which it is applied (either each row in the partition or each row returned by the query), in the ordered sequence of rows specified in the order_by_clause, beginning with 1.

You cannot use ROW_NUMBER or any other analytic function for expr. That is, you can use other built-in function expressions for expr, but you cannot nest analytic functions.

按部门分组后根据工资排序，序号rn

We present our spectroscopic observations of the galaxy NGC 7468 performed at the 6-m Special Astrophysical Observatory telescope using the UAGS long-slit spectrograph, the multipupil fiber spectrograph MPFS, and the scanning Fabry-Perot interferometer (IF

a r X i v :a s t r o -p h /0411457v 1 16 N o v 2004Astronomy Letters,vol.30,No.9,2004,pp.583-592

February 2,2008

Translated from Pis’ma v Astronomicheskii Zhurnal,vol.30,No.9,2004,pp.643-652NGC 7468:a galaxy with an inner polar disk

L.V.Shalyapina 1,A.V.Moiseev 2,V.A.Yakovl

Join in book3 unit1-4测试题

Class___________ Name___________ Mark__________

一、 写出下列单词，词组或句子的中文意思。(30分)

board( ) curtain( ) on( behind( ) under( ) in( in front of( ) thirty-two( ) forty-seven( shoes ( ) shirt( ) trousers( school uniform( ) tie( ) skirt( cardigan( ) blazer( ) sweater( play table tennis( ) ski( ) stand on your head(

Join in book3 unit1-4测试题

Class___________ Name___________ Mark__________

一、 写出下列单词，词组或句子的中文意思。(30分)

board( ) curtain( ) on( behind( ) under( ) in( in front of( ) thirty-two( ) forty-seven( shoes ( ) shirt( ) trousers( school uniform( ) tie( ) skirt( cardigan( ) blazer( ) sweater( play table tennis( ) ski( ) stand on your head(

一.that 用作关系代词，引导限制性定语从句。先行词可人可物，用法相当于who或which。（但是在下列情况下多用that：先行词既有人又有物时；先行词有形容词最高级、序数词、不定代词、very，only等修饰时；先行词是不定代词时）

He talked about the teachers and schools that he had visited. I think it one of the most wonderful films that the film company has ever produced.

She has little information that is useful for our research. Is there anything that I can do for you?

请注意，that 在定语从句中作宾语时通常可省略。 The books (that) I sent you will help you in your studies. 二.that 用作连词，引导名词性从句,状语从句和强调句。 that名词性从句。

①引导宾语从句。及物动词后的引导词that可省略。 I

外研版 必修一 模块4 单元测试题

第一部分 听力略 单项选择:语法和词汇

21. Many of the tourists _________________ to Zhangjiajie by the beauty of nature there. A.are attractive B. who attracted C. have attracted D. are attracted. 22----- What a noise! I can hardly stand it.

------ It ________ as if they are having a party next door. A. looks B. sounds C. feels D. happens 23Please don't bother _____ tha matter. A. at B. for C. about D. to

24I don't think I could _____ another year as a teacher; it's just too stressful. A. survive B.survive f