Oracle

Transferred from: http://blog.sina.com.cn/s/blog_6bccf0360101hzsh.htmlWhat is the role of 1.spool?Spool's role can be described in a sentence: in Sqlplus to save or print query results.2.spool syntax and usage examples at Oracle 9i, 10g, and

ViewWhat is a view?A view is also known as a virtual table, which is a fictitious table, which is a logical representation of a set of data.The view corresponds to a SELECT statement, and the result set is given a name, which is the name of the view.

1 --Create a temporary table space2 Create Temporarytablespace pr_temp3Tempfile'F:\app\data\tablespace\pr_temp.dbf'4 size 50m5Autoextend on Next50m maxsize 2048m6 extent management Local;7 --Create a data table space8 Createtablespace pr_data9

The set operator is specifically used to merge the results of multiple SELECT statements, including: Union,union All,intersect,minus. When using the set operation function, ensure that the data type and number of fields in the dataset are the

[Email protected]> CREATE TABLE emp_1 as SELECT * from EMP; --Schedule table created. [Email protected]> CREATE TABLE dept_1 as SELECT * from dept; --table created for main tables. [Email protected]> ALTER TABLE dept_1 add constraint pk_dept_1

SELECT * FROM (select A.id,a.oacode,a.custid,a.custname,a.xsz,a.salename,a.communicationtheme, A.communicationproperty,a.communicationtime,a.productmanager,a.creator,a.createdate from Technology_flow a where A.oastate= ' normal end ' union select

First, the comparison of the original scheme: Trigger/job/snapshot +dblink way, can be synchronized and timed refresh;Two different database servers, from one database server a user to read another database server B under a user's data, can be done

Oracle Main type functions: Single-line function: You can enter only one row of results and return a result. Common single-line functions are: Character functions numeric functions Conversion functions Date

In most cases, the query optimization strategy built into the Oracle database is still a success, but occasionally confused, even if there is an index, will do a full table scan, you can refer to the following statement, forcing the SELECT statement

1.oracle10g after the download is complete, unzip, select "Setup.exe" to start the installation after the decompression is complete.The 2.oracle home directory location is where Oracle is ready to install, called "Oracle_home", and typically Oracle

Oracle's integrity constraintsThe integrity constraints in the database are:1. PRIMARY KEY constraint (Primary)2. Unique constraint (unique)3. Check constraints4. Non-null constraint (NOT NULL)- -belongs to the CHECK constraint5. FOREIGN KEY

National Day seven days leave, decided to calm down to get started Oracle database.Environment: Ocacle 11gThe software installs the package and installs the diagram, everybody may download on my Baidu net disk: Link: http://pan.baidu.com/s/1ntjDEnZ

Sort by calculated column and calculate Column If you want to sort the calculated columns, you can specify aliases for the calculated columns and then sort them by aliases. Create a test table: Create or replace view v ASSELECT 3 AS a, 4 AS B

Solution for oracle adapter connection failure: oracle Adapter When racle Developer fails to connect, the following error occurs: listener does not currently know of SID given in connect descriptor. Solution: In D: \ app \ Administrator \ product \..

Oracle optimization auxiliary SQL statements, oraclesql statements -- Query the SQL statement being executedSelect osuser computer logon identity,The PROGRAM that initiates the request by PROGRAM,USERNAME: the USERNAME used to log on to the

OracleEBSR12-garbled characters when querying requests whose output format is "text" in Excel Oracle EBS R12-garbled query of requests whose output format is "text" in Excel Prerequisites for reproduction:Concurrent Programs whose output format is

Oracle ReportViewer and how to view Oracle ReportsOracle Report Viewer and how to view Oracle Reports today's leaders raised a question, how to view Oracle Report output, how to set the default viewing program as a browser when copying files? I did

Oracle tablespace operations-- View the tablespace SELECT tablespace_name, file_id, file_name, round (bytes/(1024*1024), 0) | 'M' total_spaceFROM dba_data_filesORDER BY tablespace_name; -- create tablespace testlogging datafile

How to force oracle select cablingIn most cases, the built-in query optimization policy of the oracle database is still very successful, but occasionally, even if there is an index, full table scanning will be performed, you can refer to the

Oracle storage process, job, view, triggerStored Procedure Create or replace procedure TestPro (Descerr out varchar2) isbegin select * from test; exception when others then Descerr: = 'interface table data generation failed! '| Sqlerrm; end