2019年江苏省研究生数学建模竞赛试题, 创新实践大赛赛题试题

适合人群： 华为HCIA/HCIP/HCIE技术认证学习及备考学员，网络管理员，网络工程师等。 课程目标： 以技术为核心，结合大量配图和案例，通俗易懂的学习HCIA关键技术！ 课程简介： Wakin全新制作，结合华为新版HCIA、HCIP、HCIE认证培训和考试大纲，结合多年授课经验，优化课程知识点的讲解顺序！ 精心制作并挑选大量专业配图及经典案例，结合生活中的实例来阐述知识点，保证能通俗易懂且快乐的学习！

更新：签出库 ，它在一个漂亮干净的Python包中重新实现了学习分支所需的一切（位于）。 图卷积神经网络的精确组合优化 Maxime Gasse，DidierChételat，Nicola Ferroni，Laurent Charlin，Andrea Lodi 这是我们NeurIPS 2019的正式实施。 安装 请参阅安装说明。 运行实验 设置覆盖 # Generate MILP instances python 01_generate_instances.py setcover # Generate supervised learning datasets python 02_generate_samples.py setcover -j 4 # number of available CPUs # Training for i in {0..4} do python 03_

目 录 (01) SELECT .................................. ............... .......................................2 查找 SELECT "栏位名" FROM "表格名" (02) DISTINCT................................. ............... .....................................2 不同值 SELECT DISTINCT "栏位名" FROM "表格名" (03) WHERE...................................... ............... ....................................2 条件 SELECT "栏位名" FROM "表格名" WHERE "条件" (04) AND OR ...................................... ............... ..................................3 条件并和或 SELECT "栏位名" FROM "表格名" WHERE "简单条件" {[AND|OR] "简单条件"} (05) IN .............................................. ............... ..................................3 包含 SELECT "栏位名" FROM "表格名" WHERE "栏位名" IN ('值一', '值二 ', ...) (06) BETWEEN.............................. ............... ........................................4 范围包含 SELECT "栏位名" FROM " 表格名" WHERE "栏位名" BETWEEN '值一' AND '值二' (07) LIKE....................................... ............... .......................................4 通配符包含 SELECT "栏位名" FROM "表格名" WHERE "栏位名" LIKE {套 式} -- 支持通配符‘_’ 单个字符 '%' 任意字符 (08) ORDER BY............................... ............... ......................................5 排序 SELECT "栏位名" FROM "表格名" [WHERE "条件"] ORDER BY "栏位 名" [ASC, DESC] -- ASC 小到大 DESC 大到小 (09) 函数........................................ ............... ......................................5 函数 AVG (平均) COUNT (计数) MAX (最大值) MIN (最小值) SUM (总合) SELECT "函数名"("栏位名") FROM "表格名" (10) COUNT .................................... .............. ......................................6 计 数 SELECT COUNT(store_name) FROM Store_Information WHERE store_name is not NULL -- 统计非空 SELECT COUNT(DISTINCT store_name) FROM Store_Information -- 统计多 少个不同 (11) Group By .................................. .............. .....................................6 字段分组 SELECT "栏位 1", SUM("栏位 2") FROM "表格名" GROUP BY " 栏位 1" (12) HAVING...................................... .............. ....................................7 函数条件定位 SELECT "栏位 1", SUM("栏位 2") FROM "表格名" GROUP BY "栏位 1" HAVING (函数条件) (13) ALIAS........................................... .............. ..................................7 别名 SELECT "表格别名"."栏位 1" "栏位别名" FROM "表格名" "表格别名" (14) 连接................................................ ..............................................8 SELECT A1.region_name REGION, SUM(A2.Sales) SALES FROM Geography A1, Store_Information A2 WHERE A1.store_name = A2.store_name GROUP BY A1.region_name (15) 外部连接........................................... ............................................9 SELECT A1.store_name, SUM(A2.Sales) SALES FROM Georgraphy A1, Store_Information A2 WHERE A1.store_name = A2.store_name (+) GROUP BY A1.store_name (16) Subquery .............................. .............. .........................................9 嵌套 SELECT "栏位 1" FROM "表格" WHERE "栏位 2" [比较运算素] (SELECT "栏位 1" FROM "表格" WHERE (17) UNION.................................... ............... ......................................10 合并不重复结果 [SQL 语句 1] UNION [SQL 语句 2] (18) UNION ALL....................................... .............. ............................ 11 合并所有结果 [SQL 语句 1] UNION ALL [SQL 语句 2] (19) INTERSECT..................................................... ............... ............. 11 查找相同值 [SQL 语句 1] INTERSECT [SQL 语句 2] (20) MINUS............................ ............... ..............................................12 显示第一个语句中不在第二个语句中的项 [SQL 语句 1] MINUS [SQL 语句 2] (21) Concatenate................................... ............... ...............................12 结果相加（串联） MySQL/Oracle: SELECT CONCAT(region_name,store_name) FROM Geography WHERE store_name = 'Boston'; SQL Server: SELECT region_name + ' ' + store_name FROM Geography WHERE store_name = 'Boston'; (22) Substring ...................................................... ............... ...............13 取字符 SUBSTR(str,pos) SUBSTR(str,pos,len) (23) TRIM ...... .............. .....................................................................14 去空 SELECT TRIM(' Sample '); TRIM()首尾, RTRIM()首, LTRIM()尾 (24) Create Table ........... .............. .....................................................14 建立表格 CREATE TABLE "表格名"("栏位 1" "栏位 1 资料种类","栏位 2" "栏位 2 资料种类",... ) (25) Create View............................. .............. ......................................15 建立表格视观表 CREATE VIEW "VIEW_NAME" AS "SQL 语句" (26) Create Index........................................... ............... ......................16 建立索引 CREATE INDEX "INDEX_NAME" ON "TABLE_NAME" (COLUMN_NAME) (27) Alter Table.. .............. ..................................................................16 修改表 ALTER TABLE "table_name"[改变方式] -- ADD 增加;DROP 删 除;CHANGE 更名;MODIFY 更改类型 (28) 主键.......................... ..................................................................18 ALTER TABLE Customer ADD PRIMARY KEY (SID) (29) 外来主键....................................... ............ ..................................18 CREATE TABLE ORDERS(Order_ID integer,Order_Date date,Customer_SID integer,Amount double,Primary Key (Order_ID),Foreign Key (Customer_SID) references CUSTOMER(SID)); (30) Drop Table................................................. ............... ...................19 删除表 DROP TABLE "表格名" (31) Truncate Table ................. ............... ............................................20 清除表内容 TRUNCATE TABLE "表格名" (32) Insert Into....................................... ............... .............................20 插入内容 INSERT INTO "表格名" ("栏位 1", "栏位 2", ...) VALUES ("值 1", "值 2", ...) (33) Update ........................ ................ ................................................20 修改内容 UPDATE "表格名" SET "栏位 1" = [新值] WHERE {条件} (34) Delete ......................................... .............. .................................21 DELETE FROM "表格名" WHERE {条件}

第一章集合与常用逻辑用语 -2021--2022学年高一上学期数学人教A(2019)必修第一册.pdf，这是一份不错的文件

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集美大学2019-2020 2014-2015计算机图形学期末试卷