Several mysql operations commonly used in PHP

Display database or table:

show databases;// You can then use database_name;

show tables;

Change table name:

alter table table_name rename new_t;

Add columns:

alter table table_name add column c_n column attributes;

Delete the columns:

alter table table_name drop column c_n;

Create indexes:

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);

Index deletion:

alter table c_table drop index c_n1;

Change column information:

alter table t_table change c_1 c_1 varchar(200);

alter table t_table modify 1 c_1 varchar(200);

insert insert statement:

insert into table_name (c_1,c_2)

values ('x1 ' ,1);

update statements:

update table_name set c_1 =1 where c_2=3;

Delete a database or table:

drop table table_name;

drop database database_name;// use mysql_drop_db() Erasable .