Oracle

(select Table5.shopareaid,table5.usersid, Table5.username from (select Sg.shopareaid,u1.usersid,u1.username,row_ Number () over (PARTITION by Sg.shopareaid ORDER by sg.shopareaid desc) numbers from shops s, Shopgroup sg,users U1 where S. Shopgroupid

In SQL Server, there is a function replicate () can implement the column chart effect, essentially using the number of occurrences of characters to control the length of the column chart, the effectIf you want to achieve the same effect within

/*View view is a table view constructed from several base tables and/or other views that are stored in query statements and do not have real data virtual tables that restrict manipulation of data Complex queries are simpler to provide different

1. SELECT statement1.1 IF ... Then ... END If statementDECLARE my_age int;if my_age is null and dbms_output.put_line (' Age is null '); END IF;　　1.2 IF ... Then Elsif then .... ELSE then ... endif statement, it should be noted here is elsif

What is archive modeThe Oracle database has an online redo log, which records changes made to the database, such as inserting, deleting, updating data, etc., which are recorded in the online redo log. A generic database must have at least 2 online

: https://github.com/hanslub42/rlwrap/releases1. Installing dependent Packages[email protected] ~]# yum install readline-devel*-y2. Installing the Rlwrap tool[Email protected] ~]# tar xvf rlwrap-0.43.tar.gz[Email protected] ~]# CD rlwrap-0.43[Email

1. Table RecoveryFor mistakenly deleted tables, you can basically recover from the Flashback table area as long as you do not use the Purge permanent delete option.The data sheet and the data can be restored back, remember flashback table is

??Replace the Oracle cluster NIC (changing a network Interface)Assume that the NIC name is changed before and after. IP, gateway, subnet mask is not changed, the cluster level is not allowed to do additional operations.After you replace the NIC, use

Ii. how the user can effectively use the data dictionaryOracle's data dictionary is one of the most important parts of a database, which is generated as a result of the database, and changes as the database changes , reflecting some of the tables

Data export:1 full export of database test, user Name System Password Manager exported to D:\daochu.dmpExp System/[email protected] file=d:\daochu.dmp full=y2 Exporting the system user in the database to the SYS user's tableExpsystem/[email

=Group by A, b+GROUP by a+GROUP BY NULL1 sql> Select Deptno,job,sum (SAL) 2 2 from EMP 3 3 GROUP by Rollup (Deptno,job); 4 5 Deptno job sum (SAL) 6-------------------------7 8 9

Stop the Listening service process (Tnslsnr) logging.Lsnrctl set Log_status off;Copy the listening log file (Listener.log) and name it in LISTENER.LOG.YYYYMMDD formatCP Listener.log listener.log.20170521Empty the Listening log file

Using Tnsnames.oraSql> Grant CREATE DATABASE link to Scott;Grant succeeded.Sql> Conn Scott/tigerConnected.Sql> CREATE DATABASE link LK connect to HR identified by HR using ' enmo1 ';Database Link created.Sql> SELECT * from [email protected];Tname

To view the database default table spaceSql> Select Property_value from database_properties where property_name = ' default_permanent_tablespace

When the Linux system is installed, it will bring its own openjdk1.xx.xx.Uninstalling OPJDKDownload ORACLEJDKInstalling the JDKRun validationSome questionsUninstalling OPJDK Use Java-version if the version is as shown, you need to uninstall

Create a table partitionCreate tablespace Apps datafile ' &1\apps.dbf ' size 10m autoextend on next 8m;create tablespace appsys datafile ' &1 \appsys.dbf ' size 10m autoextend on next 8m;Create a partitioned table spaceCreate tablespace apps_00

Pivot & Unpivot 11g new Features1     Pivotin columns - value In the form of a pair, a typical row-to- column report function . Create table test_demo (Id int,name varchar (), nums int);  ----  CREATE TABLE Insert into test_demo values (1,  '

Mainly follow the Li Xinghua Teacher's installation Steps (Http://edu.csdn.net/course/detail/3574/62057?auto_start=1), but the last step forgot password management, so unload the reinstallation.In terms of uninstallation:1) Enter Services.msc in

The conditions used for where comparison are:equals: =, , >=, <>Contains: In, not in exists, not existsRange: Between...and, not Between....andMatch test: like, not likeNULL test: Is NULL, is not NULLBoolean links: And, or, notWildcard characters:In

First from a Lezilai said: "We often hear that the number of visitors to a site every day dozens of, thousands of, millions of or even tens of millions, while the number of online users have tens of thousands of, hundreds of thousands of."From this