Oracle

Step 1: Open pd15 and find [database ],: Step 2: Click Create to create a new ODBC connection. Step 3: select the system data source and select Oracle Step 4: note that the server must write the service name configured on the Oracle

Select * From all_tab_comments; -- query tables and views of all users. Select * From user_tab_comments; -- Query all tables and views of the current user. Select * From all_col_comments; -- query the column names and comments of all user tables.

Oracle date and time processing function Summary In to_date format Day: Dd number 12 Dy abbreviated Fri Day spelled out Friday Ddspth spelled out, ordinal twelfth Month: MM number 03 Mon abbreviated MAR Month spelled out March Year: YY two digits 98

After the connection is successful, you can query it. It looks like WindowsProgramIt looks like a doscommand line tool. after entering the SQL statement, select "file/Run" to execute the SQL statement. Configuration file (this file should be

To uninstall ORACLE: Software environment: 1. Windows XP + Oracle 10g 2. Oracle installation path: D: \ oracle 1. If the database is configured with Automatic Storage Management (ASM), you should first Delete the clustering Synchronization

Simple ORACLE trigger example --- Trigger for follow-up after preoperative visitCreate or replace trigger t_update_triggerAfter update or insert or deleteOn med_smartreport_templateFor each rowDeclareStatecount number;BeginSelect count (1) into

IIS cannot access Oracle But vs2008 can access I 've been depressed for a long time and installed ORACLE Server again The Oracle client installed on the internet is accessible for the moment, but the Oracle listener cannot be started. Depressing

Oracle exp imp import skipping table PLSQL import table successfully terminated Data Import During the import process, a prompt is displayed for all tables to be imported, Skipping table Finally, the system prompts that the import is successfully

Discussion on Chinese Character Display garbled characters in Oracle databases 1 Introduction Oracle database is an industry-leading database product and has been widely used in large and medium-sized enterprises in China in recent years.

Solution to importing a later version 1. Connect the oracle9 client to the oracle10 Database 2. Use the exp of oracle9 to export Oracle Data 3. Import the data imp exported from oracle9 to the Oracle database to import the data of the later

Oracle Reports interview questions Oracle Reports interview questions Name the report triggers.Before ParameterAfter ParameterBefore reportBetween pagesAfter report What are bind parameter and lexical parameter used?A bind reference

17. Use the table alias (alias) 18. Replace in with exists 19. replace not in with not exists 20. Replace exists with table join 21. Replace distinct with exists 22. Identify 'inefficient execution' SQL statements 23. Use the tkprof tool

I still have the habit of using SQL Server. in Oracle, the update from structure is often used. In fact, there is no from statement in Oracle. Code Code highlighting produced by Actipro CodeHighlighter

Rollback segment management has always been a problem in Oracle Database Management. This article introduces the concept, usage, planning, and problem solving of Oracle rollback segments through examples. Rollback segment Overview Rollback segments

The data dictionary dict always belongs to the Oracle user SYS. 1. User: Select username from dba_users; Change Password Alter user spgroup identified by spgtest; 2. tablespace: Select * From dba_data_files; Select * From dba_tablespaces; //

1. First define the standard interface IDBAccess for database operations, and define the basic functions of the interface; 2. dynamically create an interface instance (factory mode) through enumeration Parameters) 3. base class implementation

Oracle Table Partitioning Since oracle8i, a table can be divided into several small parts, which can bring great benefits to oracle performance optimization ~For example, it can improve the query performance of tables, make it easier to manage table

8. Use the DECODE function to reduce processing time 9. Simple Integration and unrelated Database Access 10. Delete duplicate records 11. Replace DELETE with TRUNCATE 12. Try to use COMMIT as much as possible 13. Calculate the number of records 14.

I. analysis function overOracle provides analysis functions starting from 8.1.6. analysis functions are used to calculate a group-based aggregate value. What is different from aggregation functions?Multiple rows are returned for each group, while

-- Merge one row of Oracle multi-row data. SQL -- 1. Create type NUMBER_LIST_T as table of varchar2 (50 ); -- 2. Create or replace function CONCAT_LIST ( Lst IN number_list_t, separator varchar2 ) RETURN VARCHAR2 IS Ret varchar2 (2000 ); BEGIN FOR j