Oracle

The ORACLE SQL sort is sorted according to two criteria, according to the ID number from small to large sort, while the Country field is the first row in Beijing, followed by Shanghai,. Dalian, and finally other cities, how to write?The wording is

In the previous article we explained the creation of users and the major licensing issues. Let's explain the permissions include object permissions and system permissions.In fact, the last lesson we explained is the system's authority. System

After the DML statement (update, INSERT, delete) is written, a manual commit is required, and if there is no commit, the updated content is saved in memory instead of being submitted to the database and will not be seen by the other session (Dialog).

Requirements: Query data from a table and get the latest record of the data.-------------set up a test table--drop table TBCREATE TABLETB (IDINT, NameVARCHAR( -), dtdate date)-------------inserting test dataInsert intoTBVALUES(1,'Jack', To_date ('20

The recent optimization of Oracle database efficiency, and then on the Internet to check the existence of a number of high-efficiency methodsThere are a lot of suggestions on the Internet first method, I did a test, but probably not enough data

---restore content starts---Now large enterprises generally use Oracle database, Oracle database in the general use of EXPDP,IMPDP Export import data, but in the operation often encountered some problems. The following is an analysis of these

1. Open Oracle Related services2. Create Oracle UsersCreate user username identified by password; (DBA role creation required)3. Rights Management(1) Add permissionsGrant permissions, role to user name [with ADMIN option] (System permissions);Grant

Accidentally deleting the data, executing the DELETE statement incorrectly, giving the other table to delete, and executing the commit! Really sweat .... The data is quite important ... Stop talking nonsense! Find a way to do it:The first type:1.

Data is the core of the application, the program is broken the re-release of the machine can be, but once the loss of data, the loss will be irreversible, the program released to production, data backup is particularly important, because not all

1. Case USAGE:--Simple case function Sexwhen ' 1 ' Then ' Boy ' when ' 2 ' then ' girl ' else ' other ' end; --case search function Casewhen sex = ' 1 ' Then ' boy ' when sex = ' 2 ' Then ' girl ' else ' other ' end;Example: Judging the wage level,

The main function of the minus operation in Oracle is to return records that are not the same as the second table/query results in the first table/query results when two tables or two query results are performed.results not the same records include

the code of the OracleTime limit:3000/1000ms (java/others) Memory limit:65535/65535kb (java/others)Submit Status The Oracle is one of the training team's most intelligent minds, storing what he is learning in his computer. Every day through learning

Emd_maintenance.execute_em_dbms_job_procsdelete and create dbmssql.exe cute In the last optimization process, we found that EMD_MAINTENANCE.EXECUTE_EM_DBMS_JOB_PROCS was executed quite frequently in a 10 Gb ORACLE job. In fact, we have seen it

Incorrect usage of indexes caused by SQL statements When you create an index on the database, you find that the index is not used. To a large extent, it is because you did not have the correct method when writing SQL statements. In several cases,

How to delete or reset parameters in spfile and delete parameters in spfile In ORACLE, it is generally very easy to modify parameters in spfile. How can we delete parameters in spfile? Next we will use a case to introduce how to delete the

INBOUND_CONNECT_TIMEOUT and SQLNET. INBOUND_CONNECT_TIMEOUT summary, sqlnet. sendtimeout About sqlnet. ora parameter SQLNET. INBOUND_CONNECT_TIMEOUT, which indicates the waiting time for user authentication timeout. The unit is seconds and the

BBED simulate table data block corruption 1. create a test table SQL> conn tes1t/test 1Connected. SQL> create table testbbed as select * from dba_tables; Table created. SQL> col segment_name format a20; SQL> select segment_name, file_id, block_id

The same script is different on SQLPLUS and SQLDEV. I collected the information to Oracle a few days ago. oracle says the format is incorrect. It makes me collect the information again. I am very puzzled. I did it according to the official

[Translated from mos] "WARNING: Noclusterinterconnecthasbeenspecified" appears in the alert log of the database instance" "WARNING: No cluster interconnect has been specified" appears in the alert log of the database instance" Source:No Interconnect

Common oracle SQL statements, oraclesql SQL statement used to view the oracle status Select status from v $ instance;   View the SQL statement of the oracle Control File Select name from v $ controlfile;   SQL statement for viewing oracle data files