MySQL> create table fruits ( f_id char(10) not null, s_id int not null, f_name char(255) not null, f_price decimal(8,2) not null, primary key(f_id) );
mysql> insert into fruits(f_id,s_id,f_name,f_price)
-> values('a1',101,'apple','5.2'),
-> ('b1',101,'blackberry','10.2'),
-> ('bs1',102,'orange','11.2'),
-> ('bs2',105,'melon','8.2'),
-> ('t1',102,'banana','10.3'),
-> ('t2',102,'grape','5.3'),
-> ('o2',103,'coconut','9.2'),
-> ('c0',101,'cherry','3.2'),
-> ('a2',103,'apricot','2.2'),
-> ('l2',104,'lemon','6.4'),
-> ('b2',104,'berry','7.6'),
-> ('m1',106,'mango','15.7'),
-> ('m2',105,'xbabay','2.6'),
-> ('t4',107,'xbababa','2.6'),
-> ('m3',105,'xxtt','11.6'),
-> ('b5',107,'xxxx','3.6');
Query OK, 16 rows affected (0.01 sec)
Records: 16 Duplicates: 0 Warnings: 0
mysql> create table customers
-> (
-> c_id int not null auto_increment,
-> c_name char(50) not null,
-> c_address char(50) null,
-> c_city char(50) null,
-> c_zip char(50) null,
-> c_contact char(50) null,
-> c_email char(50) null,
-> primary key(c_id)
-> );
Query OK, 0 rows affected (0.00 sec)
mysql> insert into customers(c_id,c_name,c_address,c_city,c_zip,c_contact,c_email)
-> values(10001,'RedHook','200 Street','Tianjin','300000','LiMing','LMing@163.com'),
-> (1002,'Stars','333 Fromage Lane','Dalian','116000','Zhangbo','Jerry@hotnail.com'),
-> (10003,'Netbhood','1 Sunny Place','Qingdao','266000','LuoCong',NULL),
-> (1004,'JOTO','829 Riverside Drive','Haikou','570000','YangShan','sam@hotmail.com');
Query OK, 4 rows affected (0.00 sec)
Records: 4 Duplicates: 0 Warnings: 0
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mysql> select f_name from fruits;
查詢結(jié)果:
mysql> select f_name,f_price from fruits;
返回結(jié)果如下:
mysql> select f_name,f_price from fruits where f_price=5.2;
返回的結(jié)果如下:
mysql> select f_name,f_price from fruits where f_price >= 10;
返回的結(jié)果如下:
mysql> select f_name,f_price from fruits where f_price between 2 and 8;
返回的結(jié)果如下:
mysql> select f_name,s_id from fruits
-> where s_id = 101 or s_id = 103;
mysql> select f_name,s_id from fruits
-> where s_id in(101,103);
上述兩種查詢語句,返回的結(jié)果都一樣,如下:
mysql> select f_name,s_id from fruits
-> where s_id != 101 and s_id != 103;
mysql> select f_name,s_id from fruits
-> where s_id not in(101,103);
返回的結(jié)果如下:
mysql> select f_name from fruits where f_name like 'b%';
返回的結(jié)果如下:
mysql> select f_name from fruits where f_name like 'b%y';
返回的結(jié)果如下:
mysql> select f_name from fruits where f_name like 'b___y';
mysql> select * from fruits
-> where s_id = 101 and f_price > '2.0' ;
返回的結(jié)果如下:
mysql> select * from fruits where
-> s_id in(101,103) and f_price > 5;
mysql> select distinct s_id from fruits;
返回結(jié)果如下:
mysql> select s_id,f_name from fruits order by s_id;
返回的結(jié)果如下:
mysql> select f_name,f_price from fruits
-> order by f_name,f_price;
返回的結(jié)果如下:
注:多字段排序,如果第一個排序的字段一致,會依靠第二個字段排序,依次類推,如果第一個字段不一樣,則直接以第一段來進行排序。
mysql> select f_price from fruits order by f_price desc;
mysql> select s_id,count(*) as total from fruits group by s_id;
返回結(jié)果如下:
mysql> select s_id,group_concat(f_name) as name from fruits group by s_id having count(f_name) > 1;
返回的結(jié)果如下:
mysql> select * from customers where c_email is null;
查詢結(jié)果如下:
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