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PHP常用MySql操作

WBOY
WBOYOriginal
2016-05-19 14:05:00725browse

php中常用的几个 MySQL 语句

显示数据库或表:
show databases;//然后可以use database_name;
show tables;
更改表名:
alter table table_name rename new_t;
添加列 :
alter table table_name add column c_n column attributes;
删除列:
alter table table_name drop column c_n;
创建索引:
alter table c_table add index (c_n1,c_n2);
alter table c_table add unique index_name(c_n);
alter table c_table add PRimary key(sid);
删除索引:
alter table c_table drop index c_n1;
更改列信息:
alter table t_table change c_1 c_1 varchar(200);
alter table t_table modify 1 c_1 varchar(200);
insert插入语句:
insert into table_name (c_1,c_2)
values (’x1′,1);
update语句:
update table_name set c_1 =1 where c_2=3;
删除数据库或者表:
drop table table_name;
drop database database_name;//使用mysql_drop_db()可以删除的.

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