oracle sql by example

How to use Oracle's Dbms_sqltune package to execute SQL Tuning Advisor for SQL self-tuning1 ". Here is a simple example to illustrate the use of Dbms_sqltuneStart by running a SQL that you want to tune, and then get the SqlidSql> SELECT * from V$sqltext where sql_text like ' select * from dual% ';ADDRESS hash_value sql

download down the path of the package. There is one last problem, you need to set a character set, so that the query out of the data will not be garbled, write a batch processing Pldev. BAT is placed in the PL installation directory with the following contents:Set Nls_lang=simplified Chinese_china. Zhs16gbkPLSQLDev.exeThis character set, refers to the server side of the character set, please configure according to the actual situation.Finally, just double-click this batch, then fill in the acco

password you chose to set when installingcon = drivermanager.getconnection (url, user, password);//Get connectionSYSTEM.OUT.PRINTLN ("Connection Successful! ");String sql = "SELECT * from student where name=?"; /precompiled statement, "? The delegate parameterPre = con.preparestatement (SQL);//instantiation of precompiled statementsPre.setstring (1, "Liu Xianhan");//Set the parameter, the preceding 1 indic

comparison (full table scan), which is determined by the database optimizer. This is the meaning of non-procedural, that is, data retrieval is determined by the optimizer, rather than by programming. When processing SQL select, update, insert, or delete statements, Oracle must access the data involved in the statement. The Oracle optimizer is used to determine t

Oracle optimizer and SQL query execution sequence before Oracle executes an SQL statement, it first needs to check the SQL Execution Plan and then execute the SQL statement according to the execution plan, the optimizer executes t

The most basic Oracle database connection code (for oracle11g only):1, right-click Project, build path, configuration build path, select the third item "Library", then click "Add External Jar" and select "D:\Oracle\app\oracle\product\11.2.0\server \jdbc\lib\ Ojdbc6_g.jar "(Note: D:\Oracle is the installation path for t

------------------------------ ------------------------------ ---------- ---------- ------------ ------------------- ----------------------------- --------ABC Oracle 153 4290 [email protected] (TNS V1 -V3) INACTIVESYS Oracle 4417 [email protected] (TNS V1 -V3) ACTIVEABC Oracle 157 119 4830 [email protected] (TNS V1 -V3) ACTIVEEither kill it in

not be indexed, the field has only 8 values, the index value is highly repeatable, the index selectivity is significantly lower, and therefore no index is built." However, the distribution of data values on this field is very special, as shown in the following table: Range of values The 6 7 % of total data 1% 98% 1% Moreover, in the common query, the query disposalcourseflagEighth Palm use hint to force the specified indexU

Tags: IP address server directory. COM class sign Ted cat remote serverFirst, the development environment requirements: The premise is that the computer must have an Oracle client installed. Installed the Pl-sql software Second, configure PL-SQ and connect Oracle Configuration method: 1. Locate the installation directory for

SQL format execution sequence of oracle data structure and sequence number of SQL query processing, oraclesql I. execution sequence of SQL format FROM-> WHERE-> group by-> HAVING-> SELECT-> ORDER 1. The from clause assembles data from different data sources; 2. The where clause filters record rows based on specified c

It's a good night. Do you know if Oracle has an apply clause? If there is, how do I implement top + APPLY under SQL Server. The result is an example of what I have written. withA as (SelectGrp_factor from(Select distinctGrp_factor fromNumberswhereId Ten Order bygrp_factor) TwhereRowNum 5)Selectb.id, A.grp_factor fromA CrossApplySelectId from(SelectId fromNumbers

dictionary, which means more time is spent(4)Reduce access to the database: Oracle has done a lot of work internally: Parsing SQL statements, estimating index utilization, binding variables, reading data blocks, and more;(5)The ArraySize parameter is reset in Sql*plus, Sql*forms, and pro*c to increase the amount of da

An oracle + PHP query example. Qdlover.yeah.net an oracle + PHP query example originally I don't need php, but there are still a lot of friends asked me, I made an example, the specific function please refer to the manual in fact oracl http://qdlover.yeah.net An

Tags: des style io ar using SP for on fileI myself is a beginner of Oracle and SQL, some time ago saw Hanshunping Teacher's Oracle Video tutorial, feel very easy to learn, a lot of harvest. At the same time he also made a lot of notes, now want to put paper notes in their own words summed up. As the saying goes: teaching always complements each other, in the proc

First download instantclient can be downloaded to the Oracle website, to register the account, must be under the corresponding version, otherwise unsuccessful,10g,11g version of, I have been sent up, free download: Is crossing, wait a minuteConfiguration file Tnsnames.ora This one place is generally put (network/admin), only in PL/SQL----->tools-->proferences ...------>connection---- >

Just note that the output parameter is registered with the Registeroutparameter method inside the CallableStatement.Stored procedures:Import java.sql.CallableStatement;Import java.sql.Connection;Import Java.sql.DriverManager;Import java.sql.PreparedStatement;Import java.sql.SQLException;Import Java.sql.Types;Calling Oracle's stored procedures in Javapublic class Javacallpro {public static void Main (string[] args) {String driver= "Oracle.jdbc.driver.OracleDriver";String url= "JDBC:ORACLE:THIN:@1

Label:Stored procedures: Create or Replace procedure my_procedure (In_no in Number,in_name on VARCHAR2) isBeginINSERT into EMP (empno,ename) values (in_no,in_name);End Java Program Demo: Import java.sql.CallableStatement;Import java.sql.Connection;Import Java.sql.DriverManager;Import java.sql.PreparedStatement;Import java.sql.SQLException; Calling Oracle's stored procedures in Javapublic class Javacallpro {public static void Main (string[] args) {String driver= "Oracle.jdbc.driver.OracleDriver"

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Share two SQL statements 1. regexp_replace supported by Oracle SQL SQL> select regexp_replace ('fuck', '(.) (.)', '/123') from dual;Regexp_replace ('fuck ','(.)(------------------------------Ufkcy UO (Haha) There are two letters in a pair. //////////////////////////////////////// /////////////////////////////

number of records in totalrecouds table select COUNT (*) from table name totalpages total pages totalpages= totalrecouds%pagesize==0?totalrecouds/pagesize:totalrecouds/pagesize+1 pages start position pages= pagesize* (pageNumber-1) sql statement: select * from table name limit pages, pageSize; mysql paging depends on the keyword limit it requires two parameters: start position and pagesize Start position = page Size * (pages 1) Star