oracle implementation

[Oracle] Simple implementation of triggersObjective: To back up data in the uertest table to usertest_temp in real time. The two tables have the same structure. Use the oracle trigger to synchronize data. Result: 1. Create a table? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 [SQL] -- simple user table create table USERTEST (NAME VARCHAR2 (20) not null, AG

Implementation of time conversion in Oracle in several languages Implementation of time conversion in Oracle in several languages Conversion of date and time in c shell perl php: seconds and human readable date scalar localtime and seconds since '00: 00: 00 1970-01-01 UTC' Scalar localtime 26-byte string and seconds s

Implementation of auto-increment columns in Oracle databases: 1. Create a sequence -- Create sequenceCreate sequence INNERIDMinvalue 1Max value 99999999999999Start with 1Increment by 1Cache 20Order; 2. -- INNERID. currval indicates the current sequence -- INNERID. nextval indicates the next sequence.Insert into admin values (INNERID. nextval, 'A ');Insert into admin values (INNERID. nextval, 'B ');Insert in

Label: How Oracle can update newly inserted data with trigger implementation Collection 1, establish the test table CREATE TABLE TEST_TB ( ID number, WLID number, PM VARCHAR2 (100), Djzt VARCHAR2 (10), SL number, PH VARCHAR2 (100) ); 2. Set up the package and the package body and function defined with REF CURSOR: CREATE OR REPLACE Package Pkg_test AS /* Define REF CURSOR type No return type, for weak type,

MD5, all known as Message Digest algorithm 5 (the fifth edition of the Messaging Digest algorithm). For more information, please refer to Wikipedia: MD5 MD5 is encrypted with a byte array, but we typically take its hexadecimal string notation, and of course, the hexadecimal string is case-sensitive, in the MySQL database, Java, and JavaScript languages, typically using lowercase strings to represent the Oracle database in the official package, the re

After a long period of learning to create Oracle Tablespace, so share with you, after reading this article you certainly have a lot of harvest, hope this article can teach you more things. 1, first query the free space Copy Code code as follows: Select Tablespace_name,file_id,block_id,bytes,blocks from Dba_free_space; 2, increase the Oracle table space First, query the data file

In the actual use process of the Oracle database, it will increase with the increase of the relevant data, and the related files will also increase, when it reaches a certain size, it may cause insufficient disk space; then we can move the database file to another large hard disk partition. When using Oracle databases, Oracle database files gradually increase as

Problems with MYSQL-type ORACLE sequence implementation MYSQL implements the nextval method of ORACLE to create a function, as follows: -- -------------------------------------------------------------------------- Routine DDL -- Note: comments before and after the routine body will not be stored by the server -- Role DELIMITER $ create definer = 'root' @ 'localho

Implementation of over groups similar to oracle in mysql Today, when someone asks a question, the requirement is probably like this. Id S Start Time End Time 1 20 08:10:20 08:10:40 1 9 08:10:41 08:10:50 1 60 08:10:51 08:11:51 1 2 08:12:51 08:12:53 2 51 08:10:00 08:10:51 2 60

We do not need to migrate data from ORACLE to MYSQL. Below I have written three simple MYSQL functions. For your reference.Is it time? DELIMITER$$ USE`ytt`$$ DROPFUNCTIONIFEXISTS`is_date`$$ CREATEDEFINER=`root`@`localhost`FUNCTION`is_date`( f_inCHAR(19))RETURNSTINYINT(4) BEGIN --Createdbydavid.yang2012/8/9. IFUNIX_TIMESTAMP(f_in)=0THEN RETURN0; ELSE RETURN1; ENDIF; END$$ DELIMITER; Is it a number? DELIM

Mysql is similar to the over Grouping Implementation of oracle. Today, when someone asks a question, the requirement is probably like this. Id S Start Time End Time 1 20 08:10:20 08:10:40 1 9 08:10:41 08:10:50 1 60 08:10:51 08:11:51 1 2 08:12:51 08:12:53 2 51 08:10:00 08:10:51 2

How Oracle can update newly inserted data with trigger implementationCreate or Replace Trigger Tr_nameBefore insertOn tableFor each rowBegin: New. A field = ' newly value ';EndModify a field of a table of data AA (this field is specified), after saving the data in a table of the other field BB will be based on a function of the AA field value after processing updateCreate or Replace Trigger BF_ZJ_UPDATEZJMAfter update of AA on aFor each rowBeginUpdate

Label:Oracle cannot set primary key self-increment as MySQL does, and Oracle uses Sequence sequence+ Trigger trigger: Implements the self-increment of the primary key in the data table S_depart PL/SQL Illustration: 1, create the data table, as below, Departid is the primary key 2. Create sequence sequences In Oracle, sequence is a sequence that automatically increases each time it is taken. Sequence i

1. Create a Table object type.To return a Table object in Oracle, you must customize a table type as follows:Create or Replace type t_table is table of number;When the above type is defined, the function uses a table that can return a column, and if more than one column is required, you need to define an object type first. Then replace the object type with the number in the above statement;Define the object type:Create or replace type Obj_table as Obj

Tags: tab ROM desc perform must-see display based on list relationshipFor relational databases, it is common practice to write directly to the SQL pull data in the list. But this poses a problem: when the amount of data is large to a certain extent, the system memory will consume light sooner or later. In addition, network transmission is also a problem. If there are 10 million data, the user wants to see the last one, even if there is enough memory to transmit so much data on the network for tw

No SQL Server is as good as top, but Oracle has a hidden rownum column that can be used flexibly for paging effects, pagesize default 10 rowsMethod One:SELECT * FROM test where ID not in (SELECT ID from test where rownum Method Two:SELECT * FROM Test where rownum Method Three:Select ID, name from (select RowNum as rowno,t.* from Test T where rownum 　　　　Several implementation methods of