常用的SQL语句有哪些

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/***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;

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