Oracle

Using NVL (A, B) General function, statistical employee annual income, NVL () acting on any type, ie (number/varchar2/date)General function: The parameter type can be number or varchar2 or date typeUse NVL2 (A,b,c) General function, if a is not NULL,

The recent deployment project database encountered an error while compiling the package:Package CTG. Ctg_csb_common compilation ErrorError: Pls-00201:identifier ' XMLDOM ' must be declaredLine: 124Text: Function Getvaluebyxpath (Innode in

Actions performed on 9iRecord in query test tableSELECT * from Test;Delete Records in Test tableDelete from test;Get a past sessionexec dbms_flashback.disable;Check out the case of the test table 3 minutes ago.SELECT * FROM Test as of timestamp

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The first blog post, hope to write down their experience, to prevent later forget.　　　　Today encountered a mistake, that is, using MAVEN to build the project, pom.xml files in the Oracle configuration always error, in Baidu search for a long time did

　　In peacetime work in the use of these two database more, the use of the two databases there are some of the different places, many interviewers will ask the difference between the two. So, with some experience of their own feelings, to say that

First, the conceptThe primary task of the control file is to manage the state of the database and to describe the physical structure of the databaseSecond, the information contained1. Database name2. Database identifier (DBID)3. Database creation

Mysql determines whether a table exists before it is created and deletes existing tables if one existsDROP TABLE IF EXISTS Sys_area; CREATE TABLE Sys_area (id varchar) NOT NULL COMMENT ' number ', parent_id varchar (+) NOT null COMMENT ' parent

Example code:[SQL]View PlainCopy CREATE OR REPLACE FUNCTION "My_database"." F_get_user_count_by_depart " ( Depart_id_val in long ) return VARCHAR2 Is User_state varchar (16); User_count number; Begin Select Count (*) into

I. Database table space and data filesParse: A database can open n table space, a table space can contain n data files. The tablespace is a logical concept.Second, about the location of Listener.oraModifying the data on this interface will affect

I. Database table space and data filesParse: A database can open n table space, a table space can contain n data files. The tablespace is a logical concept.Second, about the location of Listener.oraModifying the data on this interface will affect

1 CREATE USER username IDENTIFIED BY password; --This is the creation user (this is the simplest creation statement without the specified tablespace) 1 GRANT CREATE SESSION TO username; --This ensures

Export Oracle_base=/opt/oracleExport oracle_home=/opt/oracle/product/11gr1/dbExport Oracle_sid=oraLd_library_path= $ORACLE _home/lib:/lib:/usr/lib: $ORACLE _home/rdbms/libExport Ld_library_pathShlib_path= $ORACLE _home/lib32: $ORACLE _home/rdbms/lib3

Today is writing a tool (WinForm) that functions as a bulk insert OR UPDATE to a table in the Oracle database.Execution of the time always error "[911] ora-00911:invalid character"　　I copy the SQL statements out to PL SQL to execute, and that's

1. Oracle Statement Data Definition language (DDL)1) CREATE table new tables2) ALTER TABLE modification3) Example of TRUNCATE table data:TRUNCATE table Stu;4) DROP TABLE Delete tablesalter usage :1. Add a field to the table:ALTER TABLE Stu add age

--oracle querying the current versionSELECT * from V$version;----------Oracle Query server-side encoding----------SELECT * from v$nls_parameters where parameter= ' nls_characterset ';----------Three ways Oracle queries the current

This is a reference to others and then summarizes the difference between the two, to facilitate their own memory1. First, Oracle database is a large database, powerful, and excellent performance, so large-scale development projects are generally

Oracle leverages the UTL_HTTP package to provide access to HTTP tools.The following code is online search, you can run directly in the Plsql.DeclareReq Utl_http. REQ;Resp Utl_http. RESP;Val varchar2 (32767);BeginReq: = Utl_http. Begin_request ('

--1, select all the information of employees in department 30Select * fromEmpwhereEMPNO= -;--2. The number of the employee who listed the position (MANAGER), nameSelectEMPNO, ename fromEmpwhereJob='MANAGER';--3. Finding employees with bonuses above

Method/Step Disable Oracle Services : Enter Computer Management, in the service, find all services at the beginning of Oracle, right-click to select Stop In the Start menu, locate Universal Installer, run Oracle Universal Installer, click