Oracle

Baggio785http: // blog.csdn.net/baggio785column Selection When PLSQL is used to perform data queries, the from clause is required, which is the same as that of SQL Server. The SELECT statement must select the target data table. There is a special

Steps: 1. Set the lexical analyzer (lexer) Ensure that the login user has the corresponding permission and ctxapp role with the ctxsys user, or directly use the ctxsys user to log on. The statement is as follows: Begin

Oracle dynamic SQL can be written in two ways: dbms_ SQL or execute immediate. The latter is recommended. The test procedure is as follows: 1. DDL and DML /*** DDL ***/BeginExecute immediate 'drop table temp_1 ';Execute immediate 'create table

Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> Import Java. SQL. * ; Public   Class Lookup { Public   Static   Void Main (string [] ARGs) Throws Sqlexception,

1. query the number of connections to the current process of the database:Select count (*) from V $ process;2. view the number of connections in the current session of the database:Elect count (*) from V $ session; 3. view the number of concurrent

Recently, you need to perform some stored procedure tests. You can only test the stored procedure in your local database instance. The results show that an error occurred while logging on to the previously created database instance. The error

In the query module of the latest project, the query condition uses the year, month, and day drop-down boxes. By default, data must be filled in the drop-down boxes, which are year, month, and day, and cascade requirements must be met. In this case,

  Code Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> Create Or Replace Trigger Trig_cas_stuBefore Insert Or Update Or Delete On Xsjwxxl For Each row

  This articleArticleIt mainly analyzes the methods in which four databases (sqlserver/Oracle/MySQL/Sybase) query the first n data records or query the intermediate N data records. Perform a simple analysis on the syntax of the four databases.

I have been using MySQL and Oracle databases for so many years. This time I have to use the C/C ++ language to call the Oracle stored procedure, so I am too lazy to look at the OCI API, I went online to find someone else's encapsulated library, and

The main function of sys_connect_by_path is to distinguish all child nodes under a parent node by a specific character, and then connect them to a column for display. Select Level , Sys_connect_by_path ( ID , '/' ) From Test Start With PID = 1

Syntax: Create global temporary table tablename ([column name Type 1], [column name Type 2]Col1 varchar2 (10 ),Col2 number ,......) On commit preserve (delete) rows;This temporary table does not occupy the tablespace, and the data of the other

In Oracle, sequence is the so-called serial number, which is automatically increased every time it is obtained. It is generally used in places where the sequence numbers need to be sorted.1. Create SequenceFirst, you must have the create sequence or

In the write and storage process, you sometimes need to return the cause of the error to facilitate viewing records. Oracle provides the following exceptions: 1. pre-defined exception: used to handle common Oracle errors. 2. Non-pre-defined

Read itpub previous post: http://www.itpub.net/viewthread.php? Tid = 981212 & extra = & page = 1Want to learn the following Oracle dual table. Oracle asktom explanation: http://asktom.oracle.com/pls/asktom/f? P = 100: 11: 0: p11_question_id: 156281

1. view the size of all tablespaces   SQL> select tablespace_name, sum (bytes)/1024/1024 from dba_data_files 2 group by tablespace_name;   2. Used tablespace size SQL> select tablespace_name, sum (bytes)/1024/1024 from dba_free_space 2 group

Here, we will introduce how to allocate permissions for oracle users and how to export data from the server using volume El, hoping to help you. Many people think it is not very difficult to allocate permissions for oracle users. However, you need

All these functions receive parameters of the character family type (except for CHR) and return character values. Except for some special descriptions, most of these functions return varchar2 values. The restrictions on the return type of the

Before executing an SQL statement, Oracle needs to analyze the statement execution plan and then execute it according to the execution plan. The execution plan of the Analysis Statement is completed by the Optimizer. In different cases, an SQL

Continued Oracle notes (1)-basic content (updating in real time ..) 1. Create a table in oracleThe statement is the same as that in SQL server.  SQL> create table Course2 (cno char (8 ),3 cname varchar2 (20 ),4 ccredit int,5 cpno char (8)6 ); The