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t1 LEFT JOIN (SELECT goods_id,goods_name FROM tdb_goods GROUP BY goods_name HAVING count(goods_name) >= 2) AS t2 ON t1.goods_name=t2.goods_name WHERE t1.goods_id > t2.goods_id; 44. Operators and functions character Functions %: any of the characters_: Any one character Numeric arithmetic functions Date-time functions SELECT DATE_FORMAT(‘2017-7-15‘, ‘%m/%d/%Y‘); //07/15/2017 Information Functions Aggregation Functions Cryptographic Functions MD5 (): Information Digest algorithm, prepare

usersDba_sources stored procedure information for all usersDba_segments use space information for all users ' segmentsDba_extents extended information for all segments of a userDba_objects basic information for all user objectsAll base tables that the cat current user can accesstab but all base tables, views, synonyms, etc. created by the previous userDict information for all tables that comprise a data dictionary 2. Data dictionaries related to database componentsTable or view description in t

usersDba_sources stored procedure information for all usersDba_segments use space information for all users ' segmentsDba_extents extended information for all segments of a userDba_objects basic information for all user objectsAll base tables that the cat current user can accesstab but all base tables, views, synonyms, etc. created by the previous userDict information for all tables that comprise a data dictionary2. Data dictionaries related to database componentsTable or view description in th

component data dictionaryThe operation of database V$datafile record systemTable Space Dba_tablespaces The basic information of the record system tablespaceDba_free_space to record free space information for a system table spaceBasic information of control file V$controlfile record system control fileV$control_record_section record the information of a document segment in a system control fileV$parameter b

usersDba_sources stored procedure information for all usersDba_segments use space information for all users ' segmentsDba_extents extended information for all segments of a userDba_objects basic information for all user objectsAll base tables that the cat current user can accesstab all base tables, views, synonyms, etc. created by the current userDict information for all tables that comprise a data dictionary2. Data dictionaries related to database componentsTable or view description in the dat

process)V$waitstat:displays block contention Statistics.this table is only updated when timed: Statistics is enabled (shows the statistics of Hot block competition, when the time statistic parameter is started, this table can only be updated)V$system_event:total waits for an event (total wait time for events)2. A view of disk filesV$datafile:d atafile information from the control fileV$filestat:d isplays The number of physical reads and writes done a

Macro photography is a special photography method that is different from conventional photography. Micro photography takes objects at a close distance and can produce images larger than the original ones. Today, I will share 30 beautiful photos of macro photography and enjoy them together. Mojtaba Jahani Joni niemelä Rdd CathS Hilde van hove Chaval Brasil Jimmy hoffman Madjid Momeni Moghaddam Christophe Kiciak Frank Steinmann Magdalena Wasiczek Marief El Fil ósofo

will give you an idea of everything about Flexbox. The article contains a number of examples that will help you to master it faster.Translator Note: Chinese Translation--"portal"How to get started with CSS Flexbox (Paul Underwood)This tutorial will guide you through the use of CSS Flexbox to start with a simple layout and gradually take you through more complex layout instances.CSS3 Flexbox Property Visualization Guide (Dimitar)This visual guide will

recovery volumes[name |] Convert compressed file to self-extracting format or convert back to compressed fileT test compressed filesU update files in a compressed fileV[T,B] Detailed list of compressed files [technical information, concise]x extract files with absolute path-Stop ScanningClearing archive properties After AC compression or decompressionAd adds a compressed file name to the destination pathag[format] Generate compressed file names using

Usage: RAR A add files to a compressed filec Add a compressed file commentCF Add File CommentCW Write compressed file comment to fileD Delete files in a compressed fileE Unzip the compressed file to the current directoryf refreshing files in a compressed filei[parameter]=K Lock Compressed filesL[T,B] List compressed files [technical information, concise]M[F] Move to compressed file [file only]P print file to standard output deviceR Repair Compressed FilesRC Rebuilding a missing volumeRN Renaming

1.Network topology650) this.width=650; "Src=" https://s2.51cto.com/wyfs02/M00/05/8F/wKiom1mndXGjAkrDAAE4t7pOhFY397.png-wh_500x0-wm_ 3-wmp_4-s_3202734672.png "title=" image 1.png "alt=" Wkiom1mndxgjakrdaae4t7pohfy397.png-wh_50 "/>2.Project Requirements Customer Requirements Linuxthe system server dual NIC is connected to two units 7706 core Switchdo The NIC's bond take active-backupMode, improve the linkfault-tolerant capability.3.Configuration Steps1,, Create bond0 Configuration

v$ OpeningV$database Database InformationV$datafile Data File InformationV$controlfile Control File InformationV$logfile Redo Log InformationV$instance DB Instance InformationV$log Log Group InformationV$loghist Log History informationV$SGA Database SGA InformationV$parameter Initialization of parameter informationV$process Database Server process informationV$bgprocess Database Background Process informationV$controlfile_record_section the information of each part of the control

DatabaseRenamefile_nameAlter Database Open;--Delete a data fileAlterTablespace ...DropDataFile--deletes the empty data file specified in the persistent tablespace. AlterTablespace ...DropTempfile--deletes the empty temporary data file specified in the staging tablespace. --ExampleAlterTablespace usersDropdatafile'd:\app\administrator\product\11.2.0\dbhome_1\database\users03.dbf';AlterTablespaceTemp DropTempfile'd:\app\administrator\oradata\orcl\temp02.dbf';Alter DatabaseTempfile'd:\app\administ

informationTable column information for the User_ind_columns user's indexTable column information for the USER_CONS_COLUMNS user's constraintsUser_clusters all cluster information for the userUser_clu_columns The content information contained in the user's clusterUser_cluster_hash_expressions Hash Cluster information1.2.3 v$ OpeningV$database Database InformationV$datafile Data File InformationV$controlfile Control File InformationV$logfile Redo Log InformationV$instance DB Instance Information

Database Server process informationV$bgprocess Database Background Process informationV$controlfile_record_section the information of each part of the control fileV$thread Thread InformationV$datafile_header information in the header of the data fileV$archived_log Archive Log InformationV$archive_dest setting information for archived logsv$logmnr_contents DML DDL result information for archived log analysi

Initialization of parameter informationV$process Database Server process informationV$bgprocess Database Background Process informationV$controlfile_record_section the information of each part of the control fileV$thread Thread InformationV$datafile_header information in the header of the data fileV$archived_log Archive Log InformationV$archive_dest setting information for archived logsv$logmnr_contents DM

changes the compressed file ParametersCW writes compressed file comments to fileD. delete the files in the compressed file.E. decompress the compressed file to the current directory.F. Refresh the files in the compressed file.I [parameter] = K. Lock the compressed fileL [T, B] list compressed files [technical information, concise]M [f] Move to a compressed file [only for files]P print the file to the standard output deviceR fix compressed filesRC rebuild the lost volumeRn rename the compressed

V $ datafile: the data file used by the databaseV $ librarycache: shares the management information of SQL statements in the pool.V $ lock: sets all object lock information by accessing database sessions.V $ log: extract information about redo log groups from the Control FileV $ logfile information about the instance resetting the log group file name and its locationV $ parameter: value of all items in the initialization parameter

specified in the persistent tablespace. AlterTablespace ...DropTempfile--deletes the empty temporary data file specified in the staging tablespace. --ExampleAlterTablespace usersDropdatafile'd:\app\administrator\product\11.2.0\dbhome_1\database\users03.dbf';AlterTablespaceTemp DropTempfile'd:\app\administrator\oradata\orcl\temp02.dbf';Alter DatabaseTempfile'd:\app\administrator\oradata\orcl\temp02.dbf'Drop;--Querying data FilesDba_data_files--contains information about all data files of the dat

Initialization of parameter informationV$process Database Server process informationV$bgprocess Database Background Process informationV$controlfile_record_section the information of each part of the control fileV$thread Thread InformationV$datafile_header information in the header of the data fileV$archived_log Archive Log InformationV$archive_dest setting information for archived logsv$logmnr_contents DM