Oracle

The start with connect by Prior is primarily used for data recursive queries of the B-tree structure type, giving any node in the B-tree structure type, traversing its final parent or child node.--CREATE TABLECreate Tableprior_test (ParentID

--Update_time is the time that goes directly into a stringSELECTTo_char (MAX(Update_time),'YYYY-MM-DD Hh24:mi:ss') asLastUpdateTime, To_char (Sysdate,'YYYY-MM-DD Hh24:mi:ss') asAccounttime fromQlk_area; --LastUpdateTime is a string, turns it into a

I computer win7 64-bit, Oracle biee11, start the Times wrong, prompt as follows: Google has a similar problem: Pick as follows: I am facing the below issue while starting the WebLogic server after configuring the OBIEE Applicatio N.error:

1, we generally do the idea of exporting is, according to the data we want, all the query out, and then export, this is a large amount of data will be very slow, here I put forward the idea is paging and buffering to achieve dynamic output .2.

Dual is a commonly used table in the development, query this table only returns a row of records, using this feature we can get the system time, in the stored procedure to assign values to variables and so on.Execute Query statement: SELECT * from

　　When I learned Oracle recently, I inadvertently saw Oracle's flashback technology flashback, when Oracle was deleting data or dropping, not directly deleted, but like Windows. Put the data into the Recycle Bin first.Select * from

drop table books, the instruction will put the tables in the Recycle Bin,With Flashback table "Bin$1oiy3qm/qjubov1bwbuogw==$0" to before drop; will be able to recover.Delete tables: drop table books purge; is to bypass the Recycle Bin, thoroughly

/*update of data increase Delete modification*/-----------------------------------Increase (only one piece of data can be inserted at a time)--customizing the Order in which data columns are insertedINSERT intoEMP (Empno,ename,sal,deptno)VALUES(8888

Because the last time we looked at Oracle's transactional consistency, when we consulted the data in the middle, I saw that this place was related to the rollback segment. So the following is a list of simple knowledge. Deeper is no longer digging

Create a member TableDROP TABLE member PURGE; CREATE TABLE member ( Mid number, name VARCHAR2) ;Modify Table ConstraintsSyntax: ALTER table name ADD CONSTRAINT constraint name constraint type (field) [Other options]To add a primary

The author of this paper simply explains that Oracle create Dblink,dblink is in a database directly to another database operation, it sounds wonderful, it is not difficult to implement, we just need to create a dblink on the database associated to

1, Conn/nolog2, Conn/as sysdba;3, create user xxx identified by xxx;4, Grant DBA to XXX;About Authorization:1, create session; Give the user the right to create a session, that is, logon rights2, unlimited tablespace; give users permission to use

?? 1 SET TIMING onDescription: Displays the execution time of the SQL statement. The default value is OFF.Used in SQLPLUS , the time is accurate to 0.01 seconds. That's ten milliseconds.In the PL/SQL DEVELOPER . Time accurate to 0.001 seconds: 2

third, view the SQL of the database 　　 1. View the name and size of the table space 　　 Select T.tablespace_name,round (SUM (bytes/(1024*1024)), 0) ts_size 　　 From Dba_tablespaces T, Dba_data_files D 　　 where t.tablespace_name = D.tablespace_name 　　

Recently in the project encountered in the Oracle database detected that the characters are all garbled, because the character set is inconsistent, so to modify their own Oracle character set, the following steps:Using Oracle's SQL Plus Command

DROP TABLET_CHANGE_LC;CREATE TABLE t_change_lc (Card_code VARCHAR2 (3), Q number, bal number);INSERT INTOT_CHANGE_LCSELECT ' 001 ' Card_code, ROWNUM Q, Trunc (dbms_random. VALUE *) Bal fromdualconnect by ROWNUM UNIONSELECT ' 002 ' Card_code, ROWNUM

First, modify the table name to modify the index and the primary keyALTER TABLE afa_auth_function RENAME to back_afa_auth_function ----Modify the form name alter tables Back_afa_auth_function RENAME Constraint pk_afa_auth_function to

The partitioned table in Oracle is a good feature in Oracle that divides large tables into smaller tables, increasing the efficiency of SQL execution for that large table, while each partition is transparent to the application.Each partition in the

I. Startup and shutdown of Oracle1, in a single-machine environmentTo start or shut down an Oracle system, you must first switch to an Oracle user, as followsSu-oracle　　A. Start the Oracle systemOracle>svrmgrlSvrmgr>connect

Test environmentOs:redhat 6.7oracle:11.2.0.4[Email protected] ~]# su-oracle[Email protected] ~]$ Sqlplus/as SYSDBASql*plus:release 11.2.0.4.0 Production on Thu May 25 15:09:24 2017Copyright (c) 1982, Oracle. All rights reserved.Connect to:Oracle