sql code

*sql optimization based on ORACLE11GR2 reading notes * Third, cursor in OracleThe cursor in Oracle is a vector of SQL parsing and execution in an Oracle database and is a data structure for C (Oracle is written in C).There are two types of cursor in

1.1.1 Summary Join is one of the important operations of the relational database system. Common Join Operations in SQL Server include internal Join, external Join, and cross Join. If we want to obtain data from two or more tables that matches rows

Inner left right join statement SQL code CREATE TABLE 'A' ('a1' VARCHAR (10) DEFAULT NULL, 'b1 'varchar (10) DEFAULT NULL, 'c1' VARCHAR (10) default null) ENGINE = innodb default charset = utf8 www.2cto.com create table 'B' ('a2 'VARCHAR (10)

-- Exception test declarev_ename EMP. empno % type; -- defines the variable beginselect ename into v_ename from EMP where empno = & gno; dbms_output.put_line ('name: '| v_ename ); exception when no_data_found then dbms_output.put_line ('unfound');

1.1.1 Summary If we want to optimize the database, we can optimize the database system using the following five methods. 1. Computer hardware optimization2. Application Optimization3. Database INDEX OPTIMIZATION4. SQL statement Optimization5.

Today when you do the project to achieve paging functionality, previously only on MySQL, Oracle has not tried, but know that there is such a rownum this thing. But this thing is not so easy to use, there are quite a lot of places to pay

Oracle's classic Oracle books: Oracle High performance tuning for 9i and 10g by Gavin Powell Book Description There are three parts to tuning a Oracle database:data modeling, SQL code tuning and physical database configuration. A data Model

Server|web Summary: This article describes how to use the XML features of Microsoft SQL Server 2000 to provide existing stored procedure Code as a Web service. Directory Brief introduction Existing code in SQL Server 2000 Summarize Brief

1. First Look at the sample table: Oracle, Scott's two sample tables SQL codeCREATETABLEEMP (EMPNO number (4), ename VARCHAR2 (byte), JOB VARCHAR2 (9 byte), MGR Numbe R (4), HireDateDATE, SAL number (7,2), COMM number (7,2), DEPTNO number (2))CREATE

Acid:atomic, consistent, Isolated, durable The store program provides an excellent mechanism for defining, encapsulating, and managing transactions. 1,mysql Transaction Support 1 The MySQL transaction support is not tied to the MySQL server itself,

Creating an index is the establishment of an index on one or more columns of a table to increase the speed of access to the table. There are 3 ways to create an index, the 3 ways to create an index when creating a table, to create an index on a

Oracle batch export Stored Procedure Method 1: PL/SQL tool export Method 2: SQL code SET echo off; SET heading off; SET feedback off; spool C: \ Documents and Settings \ Administrator \ Desktop \ proc. SQL; -- 1. If the sys user is used, use the SQL

Mysqltimestamp and int storage time bitsCN.com Mysql timestamp and int storage time SQL code Show create table 20130107 date; Create table '20301_date '( 'Id' int (11) not null AUTO_INCREMENT, 'C _ date' timestamp not null default

Mysql statement for creating a new user bitsCN.com Mysql statement for creating a new user First, log on with the root permission Create User SQL code Create user username identified by 'password '; This user can log on to the database

1. compile and install gitSql code 1 $ wget http://kernel.org/pub/software/scm/git/git-1.7.3.tar.gz # current Latest Version 2 $ tar-xzvf git-1.7.3,tar.gz # unzip out 3 $ cd git-1.7.3 # Enter directory 4 $ yum install-y gettext-devel expat-devel

PHP How to query a month or a day with data and output (article archiving function) With Articles table ID Class title Content Pubtime 1 10 Title 1 content 1 1342756599 2 11 Title 2 content 2 1339392385 3 12 Title 3 content 3 1339390661 4 10 Title 4

1.1.1 Summary Join is one of the important operations of the relational database system. Common Join Operations in SQL Server include internal join, external join, and cross join. If we want to obtain data from two or more tables that matches rows

That is to say, if versionid on the left is null and only simple association is used, the row whose versionid is null cannot be found and must be connected through left or right connections. -- Create Table Table1, Table2: Create Table Table1 (ID

PDF browse: http://files.cnblogs.com/JimmyZhang/Linq-To-Sql-Part_3-Querying-our-Database.pdf Source:LINQ to SQL (part.3-querying our database)Glossary Built-in: built-inClause: ClauseDebugger: DebuggerObject Relational er Er: object link erORM

1. Create a table first SQL code [SQL]View Plain copy print? CREATE TABLE TE (ID VARCHAR2 (2), T_code VARCHAR2 (4), T_name VARCHAR2 (4), T_amount INTEGER , T_dept VARCHAR2 (4), T_project VARCHAR2 (4), T_type VARCHAR2 (1)) CREATE TABLE TE ( ID