標籤:select deptno,job,avg(sal) from emp group by deptno,job order by deptno;select deptno,job,avg(sal) from emp group by cube (deptno,job) order by deptno;select deptno,job,sum(sal),grouping(deptno),grouping(job)from empgroup by rollup(deptno,job)
標籤:在oracle資料庫中為一張表添加一個欄位: alter table tableName add ClIENT_OS varchar2(20) default ‘0‘ not null ;在oracle資料庫中添加多個欄位: alter table tableName add (name varchar2(30) default ‘無名氏‘ not null,age number default 0 not
標籤:查詢及重複資料刪除記錄的SQL語句1、尋找表中多餘的重複記錄,重複記錄是根據單個欄位(peopleId)來判斷select * from peoplewhere peopleId in (select peopleId from people group by peopleId having count(peopleId) >
標籤:oracle grid config Grid Infrastructure Configuration: Error In OUI "SSH Connectivity" Section (文檔 ID 1997480.1Grid Infrastructure has been installed with option "Install Oracle Grid
標籤: drop後的表被放在資源回收筒(user_recyclebin)裡,而不是直接刪除掉。這樣,資源回收筒裡的表資訊就可以被恢複,或徹底清除。 1.通過查詢資源回收筒user_recyclebin擷取被刪除的表資訊,然後使用語句 flashback table <user_recyclebin.object_name or user_recyclebin.original_name> to before drop [rename to
標籤:文法select ... from 表where 過濾條件start with 查詢結果根結點的限定條件connect by 串連條件; 例子create table test(id number,parent_id number,name varchar2(100)); 假設根節點id為1全部資料(正向遞迴)select * from test start with id=1 connect by prior id
標籤:declare --定義變數 v_ename varchar2(5); v_sal number(7,2); begin --執行部分 select ename,sal into v_ename,v_sal from emp where empno=&aa; --在控制台顯示使用者名稱 dbms_output.put_line(‘使用者名稱是:‘||v_ename||‘ 工資:‘||v_sal); --異常處理
標籤:--以特定格式顯示日期select ename,to_char(hiredate,‘YYYY"年"MM"月"DD"日"‘) from emp;--排除重複行select distinct deptno,job from emp;select deptno,job from emp;--使用nvl函數處理NULLselect ename ,sal,comm,nvl(comm,0.00),sal+nvl(comm,0) from emp;--使用nvl2處理NULLselect