Oracle

one, multi-table query　　　All connection analysis, reference before essay : http://www.cnblogs.com/jiangbei/p/7420136.html　　　1. Cartesian productSelect last_name, Department_name from employees, departments　　Generating an invalid Cartesian product

1. viewing temporary table partitionsSELECT * from(SELECTUSERNAME, Session_addr, sql_id, CONTENTS, Segtype, BLOCKS* 8 / 1024x768 / 1024x768GB fromV$sort_usageORDER byBLOCKSDESC) WHEREROWNUM $;2. Viewing temporary table spacesSelect *

1. Query Oracle's executing SQL statement and the user executing the statementSELECT b.sid Oracleid, b.username Oracle user, b.serial#, spid operating system ID, paddr, sql_text executing SQL,

First, according to SQL querySELECT NAME, TYPE, Referenced_owner, Referenced_name, Referenced_type from WHERE=UPPER(' table name ') and= 'PROCEDURE';--or This methodSELECTDISTINCT NAME fromWHERE=' PROCEDURE'and UPPER(TEXTlikeUPPER( '

Oracle functions can implement many functions, and the following describes how to calculate the time difference using Oracle functions. Two date Type fields: Start_date,end_date, which calculates the time difference between these two dates

There is no workaround for libclntsh.so.11.1 errors when executing Oracle programs under root.First determine the directory where the libclntsh.so.11.1 is located:[Email protected] ~]$ Locate libclntsh.so.11.1/usr/local/oracle/product/11.2.0/dbhome_1

--Query Table IndexSelect * fromUser_ind_columnswheretable_name= Upper('Hy_project') andcolumn_name= Upper('pro_id');--Create an indexCREATE UNIQUE INDEXhy_project_pro_id onHy_project (pro_id);--work with index-generated fragments, rebuild indexes,

Create or Replace procedureProc_p_abc isV_sumday Number:=0; I Number:=0; V_calendar_date Number:=NULL; V_day Number:=NULL;begin SelectTo_date (To_char (Sysdate,'RRRR'),'yyyy')-To_date (To_char (Sysdate,'RRRR')-1,'yyyy') intoV_sumday fromdual;

Oracle fully copies the Table Structure Stored Procedures, oracle stored procedures Recently, when dealing with a table sharding problem, we need to create an automatic table sharding Stored Procedure for the program. We need to ensure that all the

Introduction to several big object data types in oracle databases, oracle Data Types We know that in oracle databases, the maximum length of the field type that can store character-type data type varchar2 is 4000. In actual business, we often

Oracle tablespace settings and Management (Code instance), oracle instance 1. Create a permanent tablespace TEST with a size of 50 MB. Auto scaling of data files is prohibited. create tablespace TESTlogging datafile 'E:\orc\TEST01.dbf' size

Oracle Database logon, oracle Database 1. Oracle Login (1) run the SQLPLUS Tool C: \ Users \ wd-pc> sqlplus (2) directly go to the SQLPLUS Command Prompt C: \ Users \ wd-pc> sqlplus/nolog (3) connect as an OS C: \ Users \ wd-pc> sqlplus/as sysdba

Relationship between PDB, CDB, and users in Oracle12c, oracle12cpdb CDB: CDB is called the Container Database and the Container Database. (Public users) PDB: PDB is called Pluggable Database, which is Pluggable. (Local User) Link example: We

Oracle 11g R2 for Win7 flagship installation tutorial, 11gwin7 Oracle is a large software company in the United States. It has very powerful functions and is the world's top Enterprise Company. It is essential to learn oracle and be proficient in

Quick oracle shutdown and enabling for Batch Processing Since oracle accounts for a large amount of memory, we usually convert auto-start to manual start. Find the managed services and the services in the application on the computer, and change

What should I do if the Oracle control file is lost ?, Oracle control loss What should I do if the control file of Oracle is lost? If you have a text backup control file, you can use the text backup control file. SQL> ALTER DATABASE BACKUP

Oracle Partition Table I. Partition Table Overview: The Table Partitioning function of Oracle brings great benefits to various applications by improving manageability, performance, and availability. In general, partitions can greatly improve the

Oracle flashback and flashback Oracle flashback flash back technical explanation Oracle flash back is divided into many levels. Database-level, table-level, and transaction processing level. At the database level, a table is deleted by mistake

How to Use partitionby in Oracle, oraclepartitionby The Parttion by keyword is an analytics function in Oracle, which can be grouped and sorted, Used together with the row_number (), rank (), dense_rank () Functions -- Row_number () ordered sorting

Not in and not exists, notinexists Previously, I thought that not exists is the same as the previous parameter, but it was found after an experiment test. The selection method of Not exists and not in is very simple, that is, only select not exists