oracle sql for dummies

Oracle SQL Performance 1. ORACLE optimizer:. RULE (based on Rules) B. COST (COST-based) c. CHOOSE (optional) sets the default optimizer. various declarations of the OPTIMIZER_MODE parameter in the ora file, such as RULE, COST, CHOOSE, ALL_ROWS, FIRST_ROWS. of course, you also overwrite SQL statements or sessions. to us

database. Wait a moment and prompt that the export is complete. Then run the following command to import data: >oracle_ctl[oracleusername][password] You do not need to specify the database name or the like here, because it has already been specified in the script. Wait for a moment after the import is complete. At this point, the knowledge about migrating SQL to Oracle by

VARCHAR2) isBeginINSERT into EMP (empno,ename) values (in_no,in_name);EndThe out parameter represents the user's outputProgram Demo:Create or Replace procedure My_pro (In_no in Number,out_name out varchar2,out_sal off number) isBeginSelect Ename,sal to Out_name,out_sal from EMP where empno=in_no;Endin Sqlplus, you want the value after the process with the output has finished executingMethod 1: Write anonymous blocksDeclareV_name Emp.ename%type;V_sal Emp.sal%type;BeginMy_pro (7369,v_name,v_sal);

Oracle pl/SQL programming the use of SQL statements select must have a return record, do not report an error saying that no data is found and must have an into select statement to return one and only one record cannot be written as where deptno = 10 because multiple records will be returned. Of course, the record mentioned here is not an absolute record, but a re

Tags: SQL query statement SQL statement SQL Tutorial SQL language SQL database tutorialOracle SQL Language Foundation and Environment readiness-beyond OCP proficient Oracle Video Tutori

Label:http://uule.iteye.com/blog/2061773 (source) Bulk Import Script : Open a Command Window > enter @ > It will let you select the file you want to import (you need to know the order of the imported files, Plsql will not automatically recognize this or write a script like LS) such as: @d:\svn\1.5 database Script \oracle\import2.sql http://blog.csdn.net/hbhgjiangkun/article/details/8208565 1, PL/

I wrote a blog about Oracle Database remote connection: Oracle database -- server-side remote connection configuration. In that article, I recommended someone else's blog, which is the topic of this blog. However, I recently used it, so I went through my blog and found that the blog had been restricted for a long time. I found this on the Internet, so I decided to write it myself, for future use and conveni

Oracle SQL advanced programming learning notes (I) SQL Execution theory 1. Shared Pool SGA1, each SQL statement executed contains parsed content in the shared pool, these statements are stored in the library cache ). no matter how many users want to execute the same SQL stat

Idea: You can remotely query the table of an Oracle database by adding a linked server to the SQL Server databaseEnvironment preparation, install the SQL Server database, install the Oracle driver, configure the Oracle connection in the configured Tnsname file, I use the

This article introducesSQL migrationThe second part: create a data file library Migration Repository ). 1. Connect to Oracle In the connection window on the left of the program, click the plus sign to add oneOracle DatabaseFor example: After the configuration is complete, click Connect to connect to the database. 2. Create a user Open the connection to Oracle Data and create a new user. In this mode, we ne

The ultimate goal of SQL optimization in Oracle database is to shorten the execution time of the target SQL statement. To achieve this, we usually have the following three ways to choose:1, reduce the resource consumption of the target SQL statement;2, parallel execution of the target

Tags: mil com grant revoke Sele AC back SEL query ------------I do not have him, but the hand is ripe, humble and foolish, and eager to be hungry------------- Summary One version: The database definition language for theLanguageDDL(data definition) . Used to create various objects in the database. such as tables, views, indexes, synonyms, and so on. Create drop truncate ALTER DQL(data query Language) querying language . Select where group by have order by The.DML(datamanipulation Language

EXISTS (SELECT 1From T_orders bWHERE b.customer_id = 12and a.employee_id = b.sales_rep_id);--T_EMPLOYEES.DEPARTMENT_ID has indexSELECT a.*From T_employees AWHERE a.department_id = 10and EXISTS(SELECT 1 from t_orders b WHERE a.employee_id = b.sales_rep_id);SELECT a.*From T_employees AWHERE a.department_id = 10and a.employee_id in (SELECT b.sales_rep_id from t_orders b);--FBIDROP TABLE T_FBI;CREATE TABLE T_FBI asSELECT ROWNUM RN, Dbms_random. STRING (' Z ', ten) NAME, Sysdate + dbms_random. VALUE

Label:Select Tools > Preferences > Options > Under plsql Developer: "Oracle Home" and "OCI Library"oracle10g in D:/oracle/oracle home for d:/oracle/product/10.1.0OCI Library for D:/oracle/product/10.1.0/db_1/bin/oci.dllRestart Plsql Developer after configuration, login succe

Installation-free Oracle Client usage PL/SQL Connection Oracle As we all know PL/SQL Connection Oracle To install Oracle Client software. Have you ever thought about not installing

The following articles describe how to quickly migrate Oracle SQL to DB2 SQL. The following describes how to port Oracle SQL to DB2 SQL, I hope you will have a better understanding of it after browsing.

Tags: integer table can also be between output UI sha off row migration[ Oracle-based SQL Optimization ] Oracle-based SQL optimization "Bo Master" Gao Ruilin "Blog Address" http://www.cnblogs.com/grl214 A. Written Intent Description In the early stage of the system development, due to les

Tags: PL/sql out create media binding exce end static Ora1. Static SQL vs. dynamic SQLThe Oracle compiled PL/SQL program block is divided into two types:The first is the pre-assembly (early binding), that is, the SQL statement during the program compilation has been determin

original SYS login, for example:Then go to the Lisi login cmd form to query the T table and find the newly added data. For example, with:"Summary" assumes that the data is manipulated with DML. Must commit, the ability to guarantee the real deposit in the database.(3) Data Control Language (DCL) such as: Grant, Revoke ...(4) Query language, such as: Select ...(5) Transaction Control Language (Transaction controls, TC). such as: Commit,rollback,savepoint ...Iii. Overview of

PL/SQL is an extension of Oracle's standard database language. Oracle has integrated PL/SQL into ORACLE servers and other tools, in recent years, more developers and DBAs have started to use PL/SQL. This article describes basic PL/SQL