原创 Oracle_071_lesson_p13

創建序列、同義詞、索引 create sequenceCREATE SEQUENCE [ schema. ] sequence[ { START WITH|INCREMENT BY } integer| { MAXVALUE integer

原创 Oracle_071_lesson_p2

SQL developer 登錄 Xmanager 顯示端口0.0連接->可直接拖表到右邊窗口 hr/hr schemaselect 語法select from dual;select {distinct column | al

原创 Oracle_071_lesson_p15

Managing Schema Objects管理模式對象 you should be able to: 1、Manage constraints 2、Create and use temporary tables3、Create and

原创 Oracle_071_lesson_p6

分組函數Group functions avg 求平均count 求數量max 求值可針對數字,日期,字符min 求值可針對數字,日期,字符sum 求總和listaggstddevvariance count詳解: count(*)將

原创 Oracle_071_lesson_p20

Managing Data in Different Time Zones 管理數據在不同的時區 you should be able to:1、Use data types similar to DATE that store fract

原创 Oracle_071_lesson_p22

Hierarchical Retrieval 層次檢索 you should be able to:1、Interpret the concept of a hierarchical query2、Create a tree-structu

原创 Oracle_071_lesson_p18

Controlling User Access 控制用戶訪問 you should be able to do the following:1、Differentiate system privileges from object priv

原创 Oracle_071_lesson_p19

Manipulating Data 數據操作 you should be able to:1、Specify explicit default values in the INSERT and UPDATE statements2、Desc

原创 Oracle_071_lesson_p16

Retrieving Data by Using Subqueries 子查詢 you should be able to:1、Write a multiple-column subquery 多列子查詢2、Use scalar subq

原创 Oracle_071_lesson_p21

Generating Reports by Grouping Related Data使用分組生成報告 you should be able to use the:1、ROLLUP operation to produce subtota

原创 Oracle_071_lesson_p17

Manipulating Data by Using Subqueries 使用子查詢控制數據 you should be able to:1、Use subqueries to manipulate data2、Insert values

原创 Oracle_052_lesson_p3

Creating an Oracle Database Using DBCA 使用DBCA創建數據庫 oracle 用戶下 DBCA建庫,SID最大8位小文件表空間的最大存儲:8K * 4M的塊=32G

原创 Oracle_071_lesson_p9

集合操作 UNION 及 UNION ALLUNION :列名,數據類型要一致,結果會默認ASC自動排序UNION ALL :結果不會去重,不排序,其他和UNION一樣用類似to_char(null), to_number(null), t

原创 Oracle_052_lesson_p2

Installing Oracle Software 安裝Oracle軟件 一般先安裝GI,在安裝DB。版本查詢 metalink.oracle.com mos文件 1、在root用戶中執行腳本echo "192.168.1

原创 Oracle_linux_lesson_p2

用戶和組 組:groupadd -g 1100 dbagroupadd -g 1200 oinstall 用戶useradd -u 1100 -g 1200 -G 1100 -d /home/oracle oracle 查看oracle用