Oracle

Select COUNT (*) from (SELECT COUNT (*) from table name GROUP by multiple data volume) table name;Give me a chestnut:For example, I have a field of data type, there are many kinds of data types.  And each data type has data for nearly some years. Is

The Oracle background process starts with the start of the instance, primarily maintaining the stability of the database, which is equivalent to a manager and internal service staff in an enterprise. They do not provide services directly to users.  

1. Start the monitoring prompt:tns-12555: Tns:permission denied TNS-12560: Tns:protocol adapter Error TNS- 00525 for Operation 1: Operation not permitted[email protected] tmp]$ LS-Altotal ADRWXRWXRWT3Root root4096Nov - the: +. DRWXR-xr-x ARoot

Oracle recovery deletes a table or table recordOne: Recovery of the table to the wrong deleted table, as long as not using the Purge permanent delete option, then recover from the flash back area hope is quite large. General steps are: 1, from the

First, reference

Installing Oracle 10g RAC with Oracle Linux 4.8 requires a lot of dependency packages to be installed, one of which is more cumbersome. Building a local source is simpler than the previous Oracle Linux 5 and 6.1. Download and install the Createrepo

Start and stop OracleStop and start Oracle needs to be switched to Oracle user only, no other user has this permissionRun Sqlplus but don't log in to Oracle:sqlplus/nologConnect to the Oracle server with the privileges of the system administrator:

Start and stop OracleStop and start Oracle needs to be switched to Oracle user only, no other user has this permissionRun Sqlplus but don't log in to Oracle:sqlplus/nologConnect to the Oracle server with the privileges of the system administrator:

We need to make him self-increment when using Oracle to create a primary key, but unlike MySQL, you need to create a sequence that looks like this:You can delete the previously created sequence, and we re-create one:DROP SEQUENCE sjgxqk_sequence;

1 --General Sort2 SELECT * fromEmpORDER bySalDESC;3 --using column ordering4 SELECT * fromEmpORDER by 6 DESC;5 --Combined Sort6 SELECT * fromEmpORDER byDeptnoASC,1 DESC;7 --translate function, the parameters are denoted by a, B, C,

Select Temp.short_pjt the original name,Temp.fproject_name name after change,Temp.fflow_person_name the author,Temp.fcreate_date Date of submissionFrom (SELECT Head.fsubject,T.fflow_person_name,T.fcreate_date,SUBSTR (Head.fsubject,InStr

The following error occurred in the database650) this.width=650; "src=" http://s5.51cto.com/wyfs02/M00/89/C6/wKioL1gcObWztHE_AADGHTpt7Vs609.jpg "title=" 1112. JPG "alt=" wkiol1gcobwzthe_aadghtpt7vs609.jpg "/>Analysis:When the database switches logs,

From: http://www.cnblogs.com/Ronger/archive/2012/03/28/2420962.htmlIn the near future, according to the project business needs to the Oracle materialized view has the contact, searches on the net on this aspect information, facilitates enhances, the

Under root user, perform the following steps:1) Modify the user's shell limit, modify the/etc/security/limits.conf fileInput command: vi/etc/security/limits.conf, press I to enter edit mode, add the following content to the file.oracle soft nproc 204

Query and delete duplicate records of the SQL statement  1, find redundant records in the table, duplicate records are based on a single field (ID) to determine the  select * from table where Id in (select ID from table group Byid have COUNT (ID) > 1

1,describe commandHere's how to use it:Sql> describe NCHAR_TST (nchar_tst as table name)The results shown are as follows:is the name empty? Type----------------------------------------- -------- ----------------------------NAME NCHAR (6)ADDR

Query and delete duplicate records of SQL statement 1, find redundant records in the table, duplicate records are based on a single field (ID) to determine the select * from table where Id in (the Select ID from table group Byid having count (ID) > 1

1.(Requires Oracle account registration)Click2. Log in to CentOS to prepare for the jobGroupadd oinstall groupadd dbauseradd-g oinstall-g dba-m oraclepasswd Oracle3. Transfer the compressed package to the Down Under Oracle homeUnzip and modify

Plan tables and storage spaces to prevent space shortages or wasted space Plan for a quick recovery zone, define the fast recovery zone in a different storage area from the data file, reducing IO contention Name of the planning

Creation of the View:Create or Replace View as Select csib. * , Sib. Stock_io_,sib. Confirm_date_ from dm_mat_contract_stock_in_bill csibleftouter Joinon= sib. Bill_code_;Oracle cursors using: http://www.cnblogs.com/sc-xx/archive/2011/12/03/2275084