Oracle

recently done Mybatis+oracle project to solve add a piece of data and return the primary key issue for the added dataController layer@RequestMapping ("/addplan") publicthrows exception{ //plan is the added data, Planid is the data

Analyze how to export all tables for a user under Oracle It's possible that many customers who use Oracle will encounter a situation where they want to export all the tables of a user, and this article provides a way to help you solve this problem

The Site page cannot be displayed intact. Checking the Web service is normal, so there may be a problem with the ORACLE database. First check that the flashback log is fullThen check that the archive log file is full. Use the following commands to

About Super Admin login does not require a password because:Three types of authentication mechanisms for databases:Operating system validation (for users with SYSDBA and Sysopera)Password file validation (for users with SYSDBA and Sysopera)Database

SELECT * FROM teacher--Joint query--01.union (also set)Select TNO from teacher where tno>1080 union(select TNO from teacher where tno>1090)--02.union all (set and show duplicate data)Select TNO from teacher where tno>1080 union ALL(select TNO from

--Stored procedure: A set of SQL statements that complete a specific function--If the user new ID number is not enough 18 bit errorCreate or replace procedure Pro_add_teacher(P_tno number,P_tname VARCHAR2,P_tid Char,P_sal number)IsE_tid_validate

--Query the number of each department, maximum wage, sum, average wage--and in descending order of total wages in a departmentSelect Deptno,max (SAL), sum (SAL), avg (SAL)From teacherGROUP BY DeptnoORDER by sum (SAL) desc-Add one more condition and

SELECT * FROM teacher--Name of all male teachers in admissions departmentIs there an admissions department in the--teacher table? Some numbers!--01. Query the Admissions Department for the corresponding numberSelect Dname,deptno from dept where

Never give up, everything is possible!!!Only to find a way to succeed, not to find excuses for failure!Oracle BASIC knowledge SQL statement classification1. Description of the classificationFour categories: 1) DQL: Data Query Language (language)2)

nonempty constraint NOT NULL A column in a database table cannot be empty Uniquely constrained unique One column in a table does not allow duplicates The column that contains the unique constraint can be null,

Wm_concat is a non-public function of Oracle and is not encouraged, and the new version of Oracle does not have this function and needs to be added manually.1. Download three files: owmctab.plb, OWMAGGRS.PLB, OWMAGGRB.PLB2. Login with Sqlplus:

1. Create a Table object type.To return a Table object in Oracle, you must customize a table type as follows:Create or Replace type t_table is table of number;When the above type is defined, the function uses a table that can return a column, and if

1. View All Users:SELECT * from Dba_users;SELECT * from All_users;SELECT * from User_users;2. View user or role system permissions (System permissions that are directly assigned to a user or role):SELECT * from Dba_sys_privs;SELECT * from

Oracle Recovery DataIn the Oracle 10g and later versions, the Recycle Bin mechanism is provided, in order to prevent misoperation by emptying the table data with a recycling mechanism.In other words, the table we deleted does not disappear

Installing Oracle today has the following issues:Then on-line BaiduThe reason for the analysis is as follows: Environment variable path length is too long.Step: (Win7) Right-click My Computer--Properties--Advanced system settings--environment

(01) Delete the table to the Recycle Bin, through what technology can be restored?Flash backWhat does the CREATE TABLE EMP as SELECT * from xxx_emp where 1<>1 mean?Create an EMP table structure from the Xxx_emp table, but no records(03) What kind of

1. View All Users:SELECT * from Dba_users;SELECT * from All_users;SELECT * from User_users;2. View user or role system permissions (System permissions that are directly assigned to a user or role):SELECT * from Dba_sys_privs;SELECT * from

The content of this blog is all from the Intelligence podcast, which is explained here.Business requirements are as follows: When entering data on a JSP page, go to the background and enter into the database.JSP page:Field design for

Step one: Unzip the two Oracle database package and click Setup.exe to run the Setup programStep two: Wait for the installer to detect if the system meets the minimum configuration requirementsStep three: Install the interface directly click Next to

Today in the project encountered a problem, is the need to batch submit 10,000 statements,Just started using Statement.addbatch (), the results are submitted when the discovery takes 26 seconds;Check the half-day, found in the batch submission also