2005.10.19 SLIDE 1IS 257 – Fall 2005 More on SQL (and MySQL) University of California, Berkeley School of Information Management and Systems SIMS 257:

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SLIDE 1IS 257 – Fall 2005 More on SQL (and MySQL) University of California, Berkeley School of Information Management and Systems SIMS 257: Database Management

SLIDE 2IS 257 – Fall 2005 Lecture Outline Review –ColdFusion –PHP More on ORACLE SQL and SQL-Plus MySQL

SLIDE 3IS 257 – Fall 2005 Web Application Server Software ColdFusion PHP ASP All of the are server-side scripting languages that embed code in HTML pages

SLIDE 4IS 257 – Fall 2005 ColdFusion Developing WWW sites typically involved a lot of programming to build dynamic sites –e.g. Pages generated as a result of catalog searches, etc. ColdFusion was designed to permit the construction of dynamic web sites with only minor extensions to HTML through a DBMS interface

SLIDE 5IS 257 – Fall 2005 What ColdFusion is Good for Putting up databases onto the Web Handling dynamic databases (Frequent updates, etc) Making databases searchable and updateable by users.

SLIDE 6IS 257 – Fall 2005 Templates Assume we have a database named contents_of_my_shopping_cart.mdb -- single table called contents... Create an HTML page (uses extension.cfm), before... SELECT * FROM contents ;

SLIDE 7IS 257 – Fall 2005 Templates cont. Contents of My Shopping Cart Contents of My Shopping Cart #Item# #Date_of_item# $#Price#

SLIDE 8IS 257 – Fall 2005 Templates cont. Contents of My Shopping Cart Bouncy Ball with Psychedelic Markings 12 December 1998 $0.25 Shiny Blue Widget 14 December 1998 $2.53 Large Orange Widget 14 December 1998 $3.75

SLIDE 9IS 257 – Fall 2005 PHP PHP is an Open Source Software project with many programmers working on the code. –Commonly paired with MySQL, another OSS project –Free –Both Windows and Unix support Estimated that more than 250,000 web sites use PHP as an Apache Module.

SLIDE 10IS 257 – Fall 2005 PHP Syntax Similar to ASP Includes most programming structures (Loops, functions, Arrays, etc.) Loads HTML form variables so that they are addressable by name <?php $myvar = “Hello World”; echo $myvar ; ?>

SLIDE 11IS 257 – Fall 2005 Combined with MySQL DBMS interface appears as a set of functions: <?php $db = mysql_connect(“localhost”, “root”); mysql_select_db(“mydb”,$db); $result = mysql_query(“SELECT * FROM employees”, $db); Printf(“First Name: %s \n”, mysql_result($result, 0 “first”); Printf(“Last Name: %s \n”, mysql_result($result, 0 “last”); ?>

SLIDE 12IS 257 – Fall 2005 SELECT Syntax: –SELECT [DISTINCT] attr1, attr2,…, attr3 as label, function(xxx), calculation, attr5, attr6 FROM relname1 r1, relname2 r2,… rel3 r3 WHERE condition1 {AND | OR} condition2 ORDER BY attr1 [DESC], attr3 [DESC]

SLIDE 13IS 257 – Fall 2005 CREATE SYNONYM CREATE SYNONYM newname FOR oldname; CREATE SYNONYM BIOLIFE for ray.BIOLIFE;

SLIDE 14IS 257 – Fall 2005 SELECT Conditions = equal to a particular value >= greater than or equal to a particular value > greater than a particular value <= less than or equal to a particular value <> not equal to a particular value LIKE ‘%wom_n%’ (Note different wild card) IN (‘opt1’, ‘opt2’,…,’optn’)

SLIDE 15IS 257 – Fall 2005 Aggregate Functions COUNT(dataitem) AVG(numbercolumn) SUM(numbercolumn) MAX(numbercolumn) MIN(numbercolumn) STDDEV(numbercolumn) VARIANCE(numbercolumn)

SLIDE 16IS 257 – Fall 2005 Numeric Functions ABS(n) ACOS(n) ASIN(n) ATAN(n) ATAN2(n, m) CEIL(n) COS(n) COSH(n) ROUND(n) SIGN(n) SIN(n) SINH(n) SQRT(n) TAN(n) TANH(n) TRUNC(n[, m]) EXP(n) FLOOR(n) LN(n) LOG(m,n) MOD(n) POWER(m,n)

SLIDE 17IS 257 – Fall 2005 Character Functions returning character values CHR(n) CONCAT(char1,char2) INITCAP(char) LOWER(char) LPAD(char, n,char2), RPAD(char, n,char2) LTRIM(char, n, cset), RTRIM(char, n, cset) REPLACE(char, srch, repl) SOUNDEX(char) SUBSTR(char, m, n) SUBSTRB(char, m, n) TRANSLATE(char, from, to) UPPER(char)

SLIDE 18IS 257 – Fall 2005 Character Function returning numeric values ASCII(char) INSTR(char1, char2[,m, n]) INSTRB(char1, char2[,m, n]) LENGTH(char) LENGTHB(char)

SLIDE 19IS 257 – Fall 2005 Date functions ADD_MONTHS(dt, n) LAST_DAY(d) MONTHS_BETWEEN(d1, d2) NEW_TIME(d, z1, z2) -- PST, AST, etc. NEXT_DAY(d, dayname) ROUND(d, fmt) -- century, year etc. SYSDATE TRUNC(d, fmt) -- century, year, etc.

SLIDE 20IS 257 – Fall 2005 Conversion Functions CHARTOROWID(char) CONVERT(char, dchar, schar) HEXTORAW(char) RAWTOHEX(raw) ROWIDTOCHAR(rowid) TO_CHAR (date, fmt) TO_DATE(char, fmt) TO_NUMBER(char,fmt ) TO_MULTIBYTE(char) TO_SINGLE_BYTE(ch ar)

SLIDE 21IS 257 – Fall 2005 Create Table CREATE TABLE table-name (attr1 attr-type CONSTRAINT constr1 PRIMARY KEY, attr2 attr-type CONSTRAINT constr2 NOT NULL,…, attrM attr-type CONSTRAINT constr3 REFERENCES owner.tablename(attrname) ON DELETE CASCADE, attrN attr-type CONSTRAINT constrN CHECK (attrN = UPPER(attrN)), attrO attr-type DEFAULT default_value); Adds a new table with the specified attributes (and types) to the database. –NOTE that the “CONSTRAINT and name parts are optional)

SLIDE 22IS 257 – Fall 2005 Create Table CREATE TABLE table-name ( attr1 attr-type PRIMARY KEY, attr2 attr-type NOT NULL, …, attrM attr-type REFERENCES owner.tablename(attrname) ON DELETE CASCADE, attrN attr-type CHECK (attrN = UPPER(attrN) attrO attr-type DEFAULT default_value); –Without “CONSTRAINT” and name parts

SLIDE 23IS 257 – Fall 2005 Types VARCHAR2(size) NUMBER(p, s) LONG -- long char data DATE -- from 4712BC to 4714 AD RAW(size) -- binary LONG RAW -- large binary ROWID -- row reference CHAR(size) -- fixed length characters

SLIDE 24IS 257 – Fall 2005 Alter Table ALTER TABLE table-name ADD attr1 attr- type; ALTER TABLE table-name ADD attr1 CONSTRAINT xxx constrainvalue; ALTER TABLE table-name MODIFY attr1 optiontochange; ALTER TABLE table-name DROP COLUMN attr1; Adds, drops or modifies a column in an existing database table. –Note: constrainvalue is any column constraint like ‘PRIMARY KEY’, REFERENCES, etc.

SLIDE 25IS 257 – Fall 2005 INSERT INSERT INTO table-name (attr1, attr4, attr5,…, attrK) VALUES (“val1”, val4, val5,…, “valK”); OR INSERT INTO table-name SELECT col1, col2, col3 as newcol2, col4 FROM xx, yy WHERE where-clause; Adds a new row(s) to a table.

SLIDE 26IS 257 – Fall 2005 DELETE DELETE FROM table-name WHERE ; Removes rows from a table.

SLIDE 27IS 257 – Fall 2005 UPDATE UPDATE tablename SET attr1=newval, attr2 = newval2 WHERE ; changes values in existing rows in a table (those that match the WHERE clause).

SLIDE 28IS 257 – Fall 2005 DROP Table DROP TABLE tablename; Removes a table from the database.

SLIDE 29IS 257 – Fall 2005 CREATE INDEX CREATE [ UNIQUE ] INDEX indexname ON tablename (attr1 [ASC|DESC][, attr2 [ASC|DESC],...]) Adds an index on the specified attributes to a table

SLIDE 30IS 257 – Fall 2005 System Information In ORACLE Find all of the tables for a user –SELECT * FROM ALL_CATALOG WHERE OWNER = ‘userid’; –SELECT * FROM USER_CATALOG; (or CAT) Show the attributes and types of data for a particular table in SQLPlus –DESCRIBE tablename;

SLIDE 31IS 257 – Fall 2005 Running commands Create file with SQL and SQLPlus commands in it. –Use a plain text editor and NOT a word processor (or save as text only) Give the file the extension.sql From inside SQLPlus type –START filename

SLIDE 32IS 257 – Fall 2005 Simple formatting in SQLPlus SET PAGESIZE 500 SET LINESIZE 79 PROMPT stuff to put out to screen TTITLE “title to put at top of results pages” COLUMN col_name HEADING “New Name”

SLIDE 33IS 257 – Fall 2005 Outputting results as a file… SPOOL filename Commands –everything that you see is copied to the file until… SPOOL STOP –File will be created with everything between the SPOOL commands

SLIDE 34IS 257 – Fall 2005 Lecture Outline Review –ColdFusion –PHP More on ORACLE SQL and SQL-Plus MySQL

SLIDE 35IS 257 – Fall 2005 MySQL The tag-line at is –The world's most popular open source database It is true, it is the most widely used open source database system with users and uses that range from individuals to major corporations and includes… –Evite –Friend Finder Network –Friendster –Google (not for search though ) –PriceGrabber.com –Ticketmaster – Yahoo! –The US Census bureau –and many, many others

SLIDE 36IS 257 – Fall 2005 MySQL myths The MySQL.com web site contains a list of common myths and misconceptions about MySQL and refutes them: –MYTH: MySQL is a new, untested database management system –MYTH: MySQL doesn’t support transactions like other proprietary database engines (it is supposed to be in the version we use here) –MYTH: MySQL is only for small, departmental, or web-based applications –MYTH: MySQL doesn’t offer enterprise-class features –MYTH: MySQL doesn’t have the type of support large corporations need –MYTH: MySQL isn’t open source any more