Oracle

--Create a sequenceCreateSequence Zonecode_seq Start with 1Increment by 1; --Create a triggerCreate or Replace TriggerZonecode_trigger beforeInsert onorg_hospitalzone_dict forEach rowbegin SelectZonecode_seq.nextval into: New. Hosp_zonecode

as we all know, when too much use of database dialect related applications such as stored procedures, triggers, the portability of the application will become worse, especially in hibernate, it is ironic, but what companies in China today will be

http://blog.csdn.net/p451933505/article/details/9272257Methods for sorting fields in Chinese, digital, and English in Oracle:For example: Order  by Nlssort (field name,' nls_sort = Schinese_pinyin_m '), To_number (Translate (field name, ' 0

1.Oracle provides privileged users, such as SYSDBA or Sysoper, who are primarily used to perform maintenance operations on the database, such as starting a database, shutting down a database, establishing a database, and performing operations such

Modify the Bdump log storage path, need to restart the database, 10G version has this parameter, 11G canceled this parameterObjective: The Oracle database sometimes produces a large number of log documents due to abnormal conditions, and the disk

There are three ways Oracle's pagingMethod one according to rowID to divideSELECT * From EMPWHERE ROWID in (SELECT RID From (SELECT ROWNUM RN, RID From (SELECT ROWID rids, EMPNO from EMP ORDER by EMPNO DESC)

Packages are used to logically combine procedures and functions, which consist of package specifications and package bodies.1), we can use the Create Package command for creating packages such as:I, create a package sp_packageII. Declare that the

InsertID= "Insert"ParameterType= "Resource"> SelectkeyResulttype= "Long"Order= "Before"Keyproperty= "id">SELECT Sys_resource_id_seq. Nextval as ID from DUALSelectkey>INSERT intoincluderefID= "T_sys_resource"/>(ID, name, type, URL, permission,

SELECT ROWNUM, ' 1 ' as FLAG, (To_date (To_char (DATE ' 2015-12-31 ', ' YYYY ') | | ' -01-01 ', ' yyyy-mm-dd ') + ROWNUM-1) as Date_dt, DATE ' 2015-12-31 ' as Data_date, SUBSTR (To_char (To_date (To_char (DATE ' 2015-12-31 ', ' YYYY ') | | ' -01-01 '

1. View all tablespace usageSelectB.file_idFile ID number,B.tablespace_name table space Name,B.bytes/1024x768/1024x768||'M'Number of bytes,(b.bytes-sum(NVL (A.bytes,0)))/1024x768/1024x768||'M'has been used, sum(NVL (A.bytes,0))/1024x768/1024x76

Anyone who may have both Tomcat and Oracle installed locally will know that after the installation of Oracle, the 8080 port of Tomcat is already occupied by Oracle.Once the Oracle database is fully installed, when we access port 8080, a xdb window

SQL Code 123456789101112131415161718192021st22232425 There is a table named TB, field segment named Name, data type nchar ( -).1. Assuming that the field data is empty, you can do it directly, regardless of the field type you

SQLLDR: Generally used to import files ending with any suffix, this time I was just trying to import a file with a suffix of. 20160101.Combined with the use of input.ctl, can be used under DOS, you can import hundreds of thousands of, millions of

Oracle recovers deleted data, mainly in two ways: SCN and timestamp.I. Recovering deleted and committed data through the SCN1. Obtain the SCN number of the current databaseSelect Current_scn from V$database; (Switch to SYS user or System user

Oracle Issue ORA-12560TNS: Protocol Adapter errorThere are three reasons why the Ora-12560:tns: Protocol adapter error is a problem:1. The monitoring service is not up. Windows platform: Start---program---management tools---services, open the

A FOREIGN key constraint (that is, referential integrity constraints)Example: There are two tables following the referential integrity between themCreate Tablestudent (--Student tableS_ID Number (5) primary key,S_NAMEVARCHAR2 (20),T_IDVARCHAR2

1. DemandOracle Linux6.7 uses Udev as ASM/dev/sdb /dev/asm-diskb/dev/sdc /dev/asm-diskc/dev/sdd /dev/asm-diskd/dev/sde /dev/asm-diske/dev/sdf /DEV/ASM-DISKF2, fault phenomenonOracle Linux 6.7 under VMware vshpere5.1, using scsi_id-related commands

Oracle Database language-Structured Query Language SQL, oracle database language I. Data Definition Language DDL 1. Create a tablespace: Creat tablespace lyy DATAFILE 'C:/app/lyy. dbf' SIZE 10 M; (create a 10 m tablespace and store it in the C drive

Tnsnames. ora file description, tnsnames. ora description Directory location Unix:$ORACLE_HOME/network/admin WINDOW:%ORACLE_HOME%\network\admin Set the corresponding environment variable: TNS_ADMIN Example of tnsname. ora File Content-- Server Load

0008 notes 04-subquery, join and combined query, and 04- 1. subquery: Nested query. The results of one query are used as the conditions for another query. For example, to list the IDs, names, and contacts of all customers who have ordered the item