linux basic commands with examples tutorial

Ngày tải lên: 12/10/2014, 23:08

Ngày tải lên: 26/01/2014, 20:20

Ngày tải lên: 05/07/2013, 11:31

... connection closes.  PHP/CURL Book with Examples     <?php // Example custom_header.php // Get Secure Page from www.neteller.com // With Custom Header. // Copyright http://curl.phptrack.com ...  &    PHP/CURL Book with Examples     <?php // Example 010 // Bug Tracking with Viewing Whats Header passed and Returns // Copyright ... ($ch); print $result; ?>  PHP/CURL Book with Examples       -   )   & -  % 8 .  ...

Ngày tải lên: 06/10/2013, 09:20

... khác. Qun tr H thng Linux - C bn 1 TÀI LIU ÀO TO QUN TR H THNG LINUX Tài liu này đc biên son theo tài liu ging dy ca Vin Linux (LPI) HÀ ... lng còn trng. n v kích thc đ hin th là 1K. Qun tr H thng Linux - C bn 36 H THNG FILE TRONG LINUX Cu trúc ca h thng file Mi h thng file có cu trúc ging nh mt ... đa cng đu tiên, trong khi th mc gc “/” ca Linux có th là ánh x ca bt k phân vùng nào. The base directories Qun tr H thng Linux - C bn 39 Mt kiu khác ca h thng file...

Ngày tải lên: 13/12/2013, 22:15

... Jumpstart with Examples ! The title of this book was originally Oracle SQL Reference, but during the writing process, we set our hearts on the new title Oracle SQL Jumpstart with Examples ... effectively, we need to understand the most basic forms of SQL, having much to do with why SQL was invented in the first place. In short, SQL database access has evolved with data modeling techniques, Oracle ... developers. Essentially this book is all about Ora- cle SQL with some interesting additions such as XML, basic PL/SQL pro- gramming, and the basic facts about Oracle Database underlying architecture. ...

Ngày tải lên: 24/12/2013, 12:17

... and shut down a database?  Enhancing the basic physical architecture of an Oracle database. Let’s begin with some very basic concepts. 3.1 The Basic Concepts Oracle Database 10 g is ... datatype. Now you know the basic terminology for tables, rows, columns, and databases. As you know, security is always an issue when it comes to infor- mation. You may be familiar with some basic ways to ... Spooling is useful for saving queries you develop in SQL*Plus. In addition, with a few extra commands, you can create a report (with headings, titles, summaries, and so on) from SQL queries and spool...

Ngày tải lên: 24/12/2013, 12:17

... DIS- TINCT and the DUAL table. So let’s begin with the basics of the SELECT statement and some simple examples just to get into the swing of things. 4.1 The Basic SELECT Statement SELECT is the ... *. An asterisk (*) represents all column names within a query when used in the SELECT statement. Square brackets mean you can include the items within the square brack- ets or leave them out ... on matching column values between tables.  Subqueries are queries executed within other queries: a SELECT statement executed within another calling SELECT statement.  Queries for table and view creation...

Ngày tải lên: 24/12/2013, 12:17

... with MUSICCD_ID = 1. An editing session can be initi- ated from within SQL*Plus using the EDIT command. EDIT In the background, SQL*Plus writes a file named AFIEDT.BUF and then opens the file with ... It gives you a way to write queries and other SQL commands via the Internet or across a network, in a Web browser. An Oracle installation comes with a miniature Web server, called HTTP Server, ... ampersand characters (&). Any string beginning with & or && is a variable! In programming, the act of replacing a variable with a value is known as variable substitution. A named...

Ngày tải lên: 24/12/2013, 12:17

... column names on the ARTIST and SONG tables. Use cau- tion with the ANSI format of the natural join. The NATURAL JOIN clause matches all columns with identical column names in the two tables. If columns ... rows from both tables as with an inner join but including rows from one or both tables that do not have matching rows in the other table. Missing values are replaced with null values.  Left ... REPLACE will replace every occurrence of the search string with the replacement string. Where the REPLACE function matches any search string within the string, TRANSLATE will match each character...

Ngày tải lên: 24/12/2013, 12:17

... Functions  CUME_DIST(expression [, expression ]) WITHIN GROUP (ORDER BY expression [, expression]) . The cumulative distribu- tion of an expression within a group of values. A cumulative fre- quency ... func- tion, we start with the probability and compute the corresponding value for the cumulative distribution. 11.2.1.4 Ranking Functions  RANK(expression [, expression ]) WITHIN GROUP (ORDER ... values.  PERCENT_RANK(expression [, expression ]) WITHIN GROUP (ORDER BY [, expression ]). A cumulative distribution ranking function. See CUME_DIST above.  DENSE_RANK(expression [, expression ]) WITHIN GROUP (ORDER BY...

Ngày tải lên: 24/12/2013, 12:17

... alike, is taken for granted.  Basic . In Oracle SQL, a basic expression is really only a string, a value, a column, or perhaps a sequence reference within a SELECT statement list. For ... your DML commands with the ROLLBACK com- mand. There are some conditions for this operation, which are dis- cussed in the next section. So before going into the precise details of DML commands ... watermark. 308 14.2 Regular Expressions with three words returns the middle word; a string with four words returns the middle two words; and strings with either one or two words are not returned...

Ngày tải lên: 24/12/2013, 12:17

... chapter deals with making changes to the database using DML commands to add, change, and remove data. We begin with the INSERT command. Figure 15.5 Two Updates to the Same Row with a SAVEPOINT Label ... XMLType datatype with respect to Oracle SQL. The XMLType datatype is merely a storage medium and has little to do with actually “doing things” to XML structures, with Oracle SQL commands. We want ... examine how XML doc- uments can be created, accessed, and manipulated directly from within Oracle SQL. To begin with, let’s briefly summarize exactly what XML is. To accomplish this, we have to start...

Ngày tải lên: 24/12/2013, 12:17

... are four simple examples for showing entire XML value contents. The first two examples will return the entire XML value in a single row on a single line. The third and fourth examples will beautify ... present the usefulness of XML with respect to both Oracle Database and relational databases in general. The next chapter will begin coverage of Data Definition Language (DDL) commands by looking at tables. 17.4 ... watermark. 416 18.6 Adding Comments to Tables  You cannot use a WHERE clause filter with a TRUNCATE com- mand like you can with a DELETE command. Thus TRUNCATE will always delete all rows from a table. You...

Ngày tải lên: 24/12/2013, 12:17

... views include a wide variety of queries. Two common ones are views with joins and views with inline subqueries. 19.3.3.1 Views with Joins Let’s dive right in by creating a complex view that ... the intent of the view. To ensure that the view is never used for updating, you can create it with the WITH READ ONLY clause as in the following example: CREATE OR REPLACE VIEW OLDMUSIC_VIEW AS SELECT ... with Joins Modifying data through a view that joins two tables is tricky. In addition to all the rules that Oracle Database 10g imposes on simple views, there are still more rules for views with...

Ngày tải lên: 21/01/2014, 18:20

... makes queries with an indexed expression in the WHERE clause much faster. Often, func- tions in the WHERE clause cause the Optimizer to ignore indexes. A function-based index provides with the Optimizer ... on the indexed columns. However, large OLTP sys- tems do use IOTs with some success, and these IOTs are likely to be for tables with a small number of columns or short row length (see Chapter 18). ... could verify Jackie’s new password by connecting with the new pass- word: CONNECT JACKIE/JACKIE#1@OLTP; Figure 23.3 Change the Password with the ALTER USER Command. Chap23.fm Page 509...

Ngày tải lên: 21/01/2014, 18:20

... recent errors. When compiling a procedure with an error, either access USER_ERRORS or type the command SHOW ERRORS into SQL*Plus. This chapter has described the basics of PL/SQL as a programming lan- guage ... Condition. A search condition with no selector. This form of the CASE statement is very similar to the IF statement shown in Fig- ure 24.14.  Selector and Expression. A selector with an expression result ... command: GRANT MUSIC_ACCESS TO PRINCE WITH ADMIN OPTION; Granting a role to a user has the same syntax as granting system privi- leges; therefore, you use the WITH ADMIN OPTION when you want the user...

Ngày tải lên: 21/01/2014, 18:20

... ARTIST_ID_SEQ START WITH 1 INCREMENT BY 1 NOMAXVALUE NOCYCLE; CREATE SEQUENCE SONG_ID_SEQ START WITH 1 INCREMENT BY 1 NOMAXVALUE NOCYCLE; CREATE SEQUENCE INSTRUMENT_ID_SEQ START WITH 1 INCREMENT ... STUDIOTIME_ID_SEQ START WITH 1 INCREMENT BY 1 NOMAXVALUE NOCYCLE; CREATE SEQUENCE MUSICCD_ID_SEQ START WITH 1 INCREMENT BY 1 NOMAXVALUE NOCYCLE; CREATE SEQUENCE GENRE_ID_SEQ START WITH 1 INCREMENT BY ... continent_ID_SEQ START WITH 1 INCREMENT BY 1 NOMAXVALUE NOCYCLE; CREATE SEQUENCE country_ID_SEQ START WITH 1 INCREMENT BY 1 NOMAXVALUE NOCYCLE; CREATE SEQUENCE retailer_ID_SEQ START WITH 1 INCREMENT...

Ngày tải lên: 21/01/2014, 18:20

Ngày tải lên: 21/01/2014, 18:20

Ngày tải lên: 21/01/2014, 18:20