Oracle

一、Oracle数据库中，把一张表的查询结果直接生成并导入一张新表中。 例如：现有只有A表，查询A表，并且把结果导入B表中。使用如下SQL语句： create table b as select * from a  二、Oracle数据库中支持把查询结果导入到另外一张表中。 例如：有两个表A和B  1)如果两个表的表结构是否相同，但要插入的字段类型相同： (1)把A表的全部字段数据插入到B表中：insert into B select * from A;  (2) put a data for

I. Differences between SYSDBA and system permissions(1) SYS: All Oracle data dictionary base tables and views are stored in the SYS user, these base tables and views are critical to the operation of Oracle, maintained by the database itself, no user

syntax for SQL to modify field lengths:ALTER TABLE name modify field type;Example code for SQL to modify field lengthsALTER TABLE Qtline modify Qtl_bidernote VARCHAR2 (4000);Standard SQL, applicable to any databaseALTER TABLE fzrtmis.reporttemplate

3.1 Creating and Managing tablesThe emp,dept,sal used in Oracle tables are all built-in tables in the system, soSQL syntax also supports the creation of tables, and to create a table, you should first understand the following OracleSome of the most

The following error was encountered today when starting Oracle on the server:Sql> startup;ORA-00119:INVALID specification for system parameter Local_listenerOra-00132:syntax error or unresolved network name ' LISTENER_ORCL 'Then, I found some

SelectTo_char (Next_day (To_date ('2015-08-14','YYYY-MM-DD'),'Monday')-7,'YYYY-MM-DD') Monday, To_char (Next_day (to_date ('2015-08-14','YYYY-MM-DD'),'Monday')-1,'YYYY-MM-DD') Sunday fromdual;SelectTo_char (Sysdate,'YYYY-MM-DD') today, Decode

Synonyms in Oracle:Summary: In simple words, the tables of different users in Oracle are generally only available to their own users, and if you do not want to authorize other users to use them in an authorized way, then create the table with the

One: Install JDK and JRE;(1) There are two ways: 1, install from the official website, 2, install the green version(2) Configuring environment variablesUnder System variables, configure the following:(1) New variable name: Java_home variable Value:

Data export:1 The database test is fully exported, user Name System Password Manager exported to D:\daochu.dmp exp System/[email protected] File=d:\daochu.dmp2 Exporting the system user in the database with the SYS user's table exp system/[email

These days to install an Oracle database, work needs, start, to the official website to download a latest version of, now is July 30, 2015, ah, the latest is 12g that version, installed a long time not installed on, finally gave up, installed a

When Oracle EBS enters responsibility from the Web interface, it prompts that there is no valid liability available each time the Web interface, click on the function of a responsibility, pop-up form, will prompt the error: Sorry, there is no valid

SELECT * |    {[ DISTINCT ] column | expression [alias], ...} from table;? Select identifies which columns are selected. From identifies the table from which to select.The column is followed by a space, followed by the alias, or as Alias, to the

Create tablespace halfayadb logging datafile ' D:\app\Administrator\oradata\orcl\halfayadb.dbf ' size 50m autoextend on Next 50m maxsize 20480m extent management local;Create user halfayadb identified by halfayadb default Tablespace halfayadb;Grant

Other databases such as MySQL have the ability to automatically grow the table ID as the record is inserted, and Oracle does not have this capability, and we have the following two ways to solve the self-growing function of the field.Because both of

Common execution time for Oracle job1. Execute Every MinuteTrunc (sysdate, ' mi ') +1/(24*60)2, daily scheduled executionsuch as: daily 0 o'clock in the morning executionTrunc (sysdate+1)Performed 1 o'clock in the morning dailyTrunc (sysdate+1) +1/24

Original Address--http://blog.csdn.net/qq525099302/article/details/47146537--Create a split type (used in the function) Create or replace type Strsplit_type as table of VARCHAR2 ( 4000);--Create a split function Create or replace function strsplit

1. List all departments that have at least one employee. (Two table union queries, and the use of group by...having) Select Dname from dept where Deptno in (select Deptno from EMP GROUP by DEPTNO have count ( *) >1); 2. List all employees who pay

--Three formats for connection queries select Ename, deptno,dname from EMP Natural join Dept;select ename, deptno,dname from EMP Join dept using (DEPTN o); Select Emp.ename, emp.deptno,dept.dname from EMP Join dept on

Create a sequenceCreate sequence TEST--sequence nameMinValue 1--Defines the minimum value that the sequence generator can produce. Option Nomaxvalue is the default option, which means there is no minimum definition, and for a descending sequence,

Example of oracle inserting data using a single cursorBackground Recently, some friends asked me how to insert multiple pieces of data into the target table in a single way. To solve this problem, let's make a small experiment.   The communication