Chapter 9: Working With Data
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1 Chapter 9: Working With Data o Working with Data DML Component of SQL Used with much greater frequency than DDL Used to Add / Maintain / Delete / Query tables INSERT Used to enter new records o Data entry Work with Class_Sample database DESCRIBE exams; ALTER TABLE exams ADD stu_id TINYINT AUTO_INCREMENT PRIMARY KEY; ALTER TABLE exams ADD class CHAR(8) DEFAULT COMI1260 ; DESCRIBE exams; Add some records o INTO as keyword is optional Best to use it for clarity INSERT INTO exams (name, numtests, totalscore, avgscore, class) VALUES ( Rob,3,300,100, COMI1100 ); List fields then corresponding values Most explicit AUTO_INCREMENT ignored May add only partial records this way as well INSERT INTO exams (name, numtests, totalscore) VALUES ( Sara,3,287); See class uses DEFAULT o Abbreviated version Field names not required But all fields MUST be entered Issue with AUTO_INCREMENT INSERT INTO exams VALUES ( Tom,3,150,50,6, COMI1100 );
2 o Using results of calculations or functions Avgscore field INSERT INTO exams (name, numtests, totalscore, avgscore) VALUES ( Walt,3,266,totalscore / numtests); With no quotes, text is treated as field names or reserved words Values requiring quotation marks precede with backslash (\) O Rielly o Multiple values at once! Use multiple values clauses INSERT INTO exams (name, numtests, totalscore) VALUES ( Carl,4,410), ( Deb,4,440), ( Ed,4,418); o UNIQUE fields Dealing with duplicate values INSERT INTO exams (name, numtests, totalscore, stu_id) VALUES ( Alice,3,238,1); Duplicate error, will not add record INSERT IGNORE INTO exams (name, numtests, totalscore, stu_id) VALUES ( Alice,3,238,1); No error, record still not added Works well in transactions where individual errors do not abort entire process INSERT IGNORE INTO exams (name, numtests, totalscore, stu_id) VALUES ( Alice,3,238,1) ON DUPLICATE KEY UPDATE name = Alice, stu_id = 1; Name and stu_id fields are changed for 1 st record ON DUPLICATE clause simply replaces the values you specify REPLACE deletes the old record and replaces it with a new one o NULL fields Use NULL keyword for the value DO NOT use
3 UPDATE Changing values in existing records UPDATE exams SET name = Mary WHERE name = Walt ; o Make sure you specify a WHERE clause or ALL records will be updated UPDATE exams SET totalscore = 450, numtests = 5, avgscore = 90 WHERE name = Mary ; o Multiple fields can be changed at one time Using calculations SELECT * FROM Exams; UPDATE exams SET avgscore = totalscore / numtests; o All records changed since no WHERE clause DELETE Delete statement o Deletes records without modifying table Remembers previous value of auto_increment DELETE FROM exams WHERE name = Alice ; o DO NOT omit WHERE clause ALL RECORDS will be deleted May be used to delete records from multiple tables in one statement o Impact of JOIN Chapter 10 Truncate statement o Best used when you want to empty table of all records o Faster than delete Drops table and regenerates it Retrieving records SELECT usage o Limits SELECT * FROM exams LIMIT 3; SELECT name FROM exams ORDER BY RAND() LIMIT 1; o Aliases Used to change / simplify table & field names SELECT name, numtests, totalscore AS score FROM exams;
4 AS keyword FROM exams AS e Again see JOIN Chapter 10 o Group by Typically used to summarize or sub-total SELECT class FROM exams; SELECT class FROM exams GROUP BY class; Combine with functions SELECT class, AVG(avgscore) FROM exams GROUP BY class; HAVING qualifier SELECT class, AVG(avgscore) FROM exams GROUP BY class HAVING AVG(avgscore) > 75; Works like WHERE More efficient only operates on records included in SELECT o MUST be part of SELECT o Variables Use to store results of select queries to be used in future queries Connection-specific, they only exist for duration of the session AVG(avgscore) FROM exams; SELECT name, class, avgscore FROM exams WHERE avgscore ORDER BY class, avgscore DESC; Variable names are case sensitive and can store any data type o Subqueries One query nested inside another Use result of inner query within outer one Works inside out SELECT name, avgscore FROM exams; SELECT AVG(avgscore) FROM exams; SELECT name, class, avgscore FROM exams WHERE avgscore > (SELECT AVG(avgscore) FROM exams; o Other SELECT keywords DISTINCT Eliminates duplicate values in result set SELECT numtests FROM exams; SELECT DISTINCT numtests FROM exams; SQL_CALC_FOUND_ROWS
5 Gives the total number of rows that result from query regardless of limit SELECT * FROM exams LIMIT 3; SELECT SQL_CALC_FOUND_ROWS * FROM exams LIMIT 3; SELECT FOUND_ROWS(); Copying Records Use INSERT & SELECT o Use results of a SELECT query to populate a table SHOW TABLES; CREATE TABLE grades LIKE exams; SELECT * FROM grades; INSERT INTO grades Importing Records Ability to load in raw data from a text file o Parse by row column delimiters o Automatically insert into table CREATE TABLE class (class CHAR(8), credits TINYINT(1), room CHAR(4)); SELECT * FROM class; LOAD DATA INFILE C:\Ch9_Data.txt INTO TABLE class FIELDS TERMINATED BY, LINES TERMINATED BY \r\n ; o Input file in \MySQL\MySQL Server 4.1\data SELECT * FROM class; LOAD DATA LOCAL INFILE C:/My Documents/Ch9_Data1.txt INTO TABLE class FIELDS TERMINATED BY, LINES TERMINATED BY \r\n ; o From a file on the client side LOCAL SELECT * FROM class; Exporting Records Used to extract from MySQL to an external file SELECT * FROM exams INTO OUTFILE c:\exams.txt ; o MySQL does not allow target file to be written to client this way Uses \MySQL\MySQL Server 4.1\data Clean up extract format
6 SELECT * FROM exams INTO OUTFILE c:\exams1.txt LINES TERMINATED BY \r\n ; o \r end of record terminator = newline (\n) For binary data use INTO DUMPFILE o Writes output file as a single line o Avoids corruption of binary data
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