mysql> select * from sales;

MYSQL數據庫9 rows in set (0.01 sec)

MYSQL數據庫SELECT name AS Name,
??? CASE category
??? WHEN "Holiday" THEN "Seasonal"
??? WHEN "Profession" THEN "Bi_annual"
??? WHEN "Literary" THEN "Random" END AS "Pattern"
FROM sales;???????????????????

MYSQL數據庫9 rows in set (0.00 sec)

MYSQL數據庫CREATE TABLE sales(
??? num MEDIUMINT NOT NULL AUTO_INCREMENT, name CHAR(20), winter INT, spring INT,
??? su妹妹er INT, fall INT, category CHAR(13), primary key(num)
) ENGINE=MyISAM;

MYSQL數據庫insert into sales value(1, 'Java', 1067 , 200, 150, 267,'Holiday');
insert into sales value(2, 'C',970,770,531,486,'Profession');
insert into sales value(3, 'JavaScript',53,13,21,856,'Literary');
insert into sales value(4, 'SQL',782,357,168,250,'Profession');
insert into sales value(5, 'Oracle',589,795,367,284,'Holiday');
insert into sales value(6, 'MySQL',953,582,336,489,'Literary');
insert into sales value(7, 'Cplus',752,657,259,478,'Literary');
insert into sales value(8, 'Python',67,23,83,543,'Holiday');
insert into sales value(9, 'PHP',673,48,625,52,'Profession');

SELECT CASE WHEN 10*2=30 THEN '30 correct'
?? WHEN 10*2=40 THEN '40 correct'
?? ELSE 'Should be 10*2=20'
END AS `result`;

SELECT CASE 10*2
?? WHEN 20 THEN '20 correct'
?? WHEN 30 THEN '30 correct'
?? WHEN 40 THEN '40 correct'
?? ELSE 'No results'
END AS `result`;

CREATE TABLE DVDs (
?? ID SMALLINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
?? Name VARCHAR(60) NOT NULL,
?? NumDisks TINYINT NOT NULL DEFAULT 1,
?? RatingID VARCHAR(4) NOT NULL,
?? StatID CHAR(3) NOT NULL
) ENGINE=INNODB;
INSERT INTO DVDs (Name, NumDisks, RatingID, StatID)
VALUES ('Christmas', 1, 'NR', 's1'), ('Doc', 1, 'G',? 's2'), ('Africa', 1, 'PG', 's1'), ('Falcon', 1, 'NR', 's2'),
?????? ('Amadeus', 1, 'PG', 's2'), ('Show', 2, 'NR', 's2'), ('View', 1, 'NR', 's1'), ('Mash', 2, 'R',? 's2');
SELECT Name, RatingID AS Rating,
?? CASE RatingID
????? WHEN 'R' THEN 'Under 17 requires an adult.'
????? WHEN 'X' THEN 'No one 17 and under.'
????? WHEN 'NR' THEN 'Use discretion when renting.'
????? ELSE 'OK to rent to minors.'
?? END AS Policy
FROM DVDs
ORDER BY Name;

MYSQL數據庫8 rows in set (0.01 sec)