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and functions, there are PL/SQL blocks for declaring, executing, and exception handling, and the stored procedure is called by the program, and the trigger is triggered by the event, the trigger cannot accept the parameter, and the Oracle event refers to the additions and deletions to the table or view.You can trigger on each line or statement operation before adding or deleting the operation or after the operation.The composition of the trigger:1. T
Oracle Study Notes --- (4) Thu Create a user and authorize the user in the System user:Create user usera identifiedBy usera defalut tablespace test;Grant connect, resourceUsera; 1. Synonyms Private and public PRIVATE: created by a common user. Only the user who creates the synonym can use it.Prerequisites: normal users have access rights to Scott's table EMP.Connect Scott/tiger;Grant
[Oracle] Chapter 4 Exception Handling Chapter 4 Exception Handling PL/SQL blocks are the basic units for PL/SQL programs. Combine logic-related statements and statements PL/SQL consists of three parts: Declaration, executable, and exception handling. [DECLAREdeclarations]BEGINexecutable statements[EXCEPTIONhandlers]END; The following example demonstrates how to u
);}} Five. Triggers1.--creating triggers to add data-raising actionsCREATE OR REPLACE TRIGGER tri_add_empAfterINSERT on EMP BEGINDbms_output.put_line (' added a piece of data ');END; --Add a piece of data to see if it triggersINSERT into EMP (EMPNO,ENAME,DEPTNO) VALUES (1, ' Tom ', 10); 2.--system time-triggered triggersCREATE OR REPLACE TRIGGER tri_empBeforeDELETE or UPDATE or INSERTOn EMPFor each ROW DECLAREV_datestr VARCHAR2 (20);BEGINSELECT to_char (sysdate, ' yyyy-mm-dd ') into the v_datest
Oracle trigger 4-database event trigger Oracle trigger 3-DDL trigger http://www.bkjia.com/database/201304/201421.html Create database event TRIGGER Syntax 1 CREATE [or replace] TRIGGER trigger_name2 {BEFORE | AFTER} {database_event} ON {DATABASE | SCHEMA} 3 DECLARE4 Variable declarations5 BEGIN6... some code... 7. The database event trigger is triggered when a da
Oracle BASICS (4) pl/SQL PL/SQL is also a program Language called Procedural Language/SQL ). PL/SQL is an extension of SQL statements in Oracle databases. The features of the programming language are added to the use of common SQL statements. Therefore, PL/SQL organizes data operations and query statements into procedural units of PL/SQL code, implement complex f
Oracle (4) --) Advanced subquery ~) This section will discuss the more complex application of instant queries, mainly to simplify SQL and improve performance from the aspect, of course .. There are many ways to improve performance .. Today I attended a lecture on Oracle performance tuning and learned about all aspects of Orac
Oracle note (4) Structured Query Language (Structured Query Language): simple Query, limited Query, and data sorting 1. It is a database Query and programming Language, it is used to access data and query, update, and manage relational database systems. ANSI (American National Standards Institute) claims that SQL is the standard language for relational database management systems.
application online offlineOra... s2.inst application online racdb02Ora... sm1.asm application online offlineOra... 01. lsnr application online offlineOra... b01.gsd application online offlineOra... b01.ons application online offlineOra... b01.vip application online racdb02Ora... sm2.asm application online racdb02Ora... 02. lsnr application online racdb02Ora... b02.gsd application online racdb02Ora... b02.ons application online racdb02Ora... b02.vip application online racdb02[
194./* + ordered */ According to the order in which the table appears in from, ordered connects Oracle to the table in this order. For example: Select/* + ordered */a. col1, B. col2, C. col3 from Table1 A, Table2 B, Table3 c Where a. col1 = B. col1 and B. col1 = C. col1; 195./* + use_nl (table )*/ Connect the specified table to the nested connected row source and use the specified table as the internal table. For example: Select/* + ordered use_nl (bs
Information[Email protected] ~]$ OcrcheckStatus of Oracle Cluster Registry is as follows:Version:3Total Space (Kbytes): 262120Used Space (Kbytes): 2740Available Space (Kbytes): 259380id:1483487587Device/file Name: +ovdataDevice/file Integrity Check Succeeded?Device/file Not Configured?Device/file Not Configured?Device/file Not Configured?Device/file Not Configured?Cluster Registry Integrity Check succeeded?Logical corruption check bypassed due to non
In Oracle, four lobs types are available: blob, clob, bfile, and nclob. The following is a brief introduction to the lob data type. Blob: Binary lob, Which is binary data. It can be up to 4 GB and stored in the database. Clob: character lob, character data, up to 4 GB, stored in the database. Bfile: binary file; read-only binary data stored outside the databa
Oracle SQL classical query expert Article 4 Oracle SQL classical query expert Article 4 This article is the fourth article on typical query of OracleSQL. It is just the author's own opinion. If you have any questions, I hope you can provide suggestions or methods. At the same time, you are welcome to add that, if you h
syntax is as follows: column_name CONSTANT value An expression Set the value of the column to the value of the expression, with the following syntax: column_name EXPRESSION "SQL string" Current date Set the value of the column to the current date with the following syntax: column_name Sysdate Sequence The value of the Set column is a unique sequence number with the following syntax: Example: [Plain]View PlainCopyprint? ID SEQUENCE (+) It is important to note that sequen
This article will discuss and share with you some common classic queries of oracle SQL. You are welcome to add them. You can also share some classic queries. In this article, if you think there is any better solution to every problem, you are welcome to raise it in time. Communication and sharing can make progress together. Thank you! Next three articles: [Recommended] html "> oracle SQL: The first article
44.99 44.99 44.99 44.99 44.99 44.99 44.99 44.99 44.99 44.99 44.99-44.99 44.99 44.99 44.99 44.99 44.99 Just now, we found the first and last record, if we want to find the first N records or the next n records, how to do that? Don't worry, Oracle provides us with the Ntile function. The Ntile function allows us to divide a
How to use the Oracle database in PHP (4), read how to use the Oracle database in PHP (4 ), using OCI to input data to the data table "> Same as above, but it is written using OCI. Related PHP code: If ($ submit = "click "){ // The submit button was clicked! // Get the input for fullname and email then store it in
Configure channel1Device typeDiskFormat'/backup/archive/orcl/backup_%u'Configuration Backup has two copies of configure DataFileBackupCopies forDevice typeDisk to 2; Automatic backup control file Configure Controlfile Autobackup on; Clears the default Channel 1 setting configure channel1Device typeDiskClear Settings control file backup format Configure Controlfile autobackup format forDevice typeDisk to '/backup/archive/orcl/controlfile. Orcl.%f'; Check the archive log crosscheck Archivelog A
Tags: span int pre style Oracle Drop Recovery Books DBA --Add, modify, and delete constraints --1. Add Constraint ALTER TABLE table Add[constraint constraint]Constraint_type (column1[, Column2,...]) [constraint_parameters]; Alter TableBooks Modify Title not NULL;--add a non-null constraint --2. Modifying Constraints ALTER TABLE TableMODIFY[CONSTRAINT CONSTRAINT] [PRIMARY KEY]|[UNIQUE (column1[,column2,...])] [constraint_parameters]; --3. Renaming a co
blocking the completion of the statement and inform the owner of the transaction, if necessary, to break the transaction.Sql> Select Sql_text,saddr from V$sqlarea,v$session 2 where v$sqlarea.address=v$session.sql_address 3 and Sql_text Like ' Alter tablespace% '; Sql_text saddr----------------------------------------------------------------- -alter tablespace test_tbs01 Read Only 0000000070f6fe40-in//This is the session address where the table space is set as a read-only statement sql> select S
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