/** *MySQL语句学习总结 *Author:bdzsl2013 */ ~~~~~~~数据库操作~~~~~~~ 1、查看数据库 show databases; 2、选择数据库 use dbname; 3、创建数据库 create database dbname; 4、删除数据库 drop database dbname; ~~~~~~~~~表操作~~~~~~~~~ 1、创建表 create table tbname ( col1 type1 [not null] [primary key], col2 type2 , ... coln typen ); 2、查看表结构 describe tbname; 3、删除表 drop table tbname; 4、修改表名 alter table tbname rename newname; 5、增加列 alter table tbname add column colname coltype; Tips:列增加后将不能删除 6、删除列 alter table tbname drop column colname; 7、修改列信息 alter table tbname change column colname name type; ~~~~~~~~~基本mysql语句~~~~~~~~~ 1、选择 select * from tbname where constrainment(约束条件) 2、插入 insert into tbname(field1,field2) values(value1,value2); 3、删除 delete from tbname where constrainment(约束条件) 4、更新 update tbname set field1=value1 where constrainment(约束条件) 5、查找 select * from tbname where field1 like '%value%';(like语法) 6、排序 select * from tbname order by field1,field2[desc]; 7、总数 select count(field1) as totalcount from tbname; 8、求和 select sum(field1) as sumvalue from tbname; 9、平均 select avg(field1) as avgvalue from tbname; 10、最大 select max(field1) as maxone from tbname; 11、最小 select min(field1) as minone from tbname;