Common MySql operations in PHP

Several MySQL statements commonly used in php show databases or tables: showdatabases; then you can usedatabase_name; showtables; change the table name: altertabletable_namerenamenew_t; add columns: altertabletable_nameaddcolumnc_ncolumnattribut several MySQL statements commonly

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 column:
Alter table table_name add column c_n column attributes;
Delete column:
Alter table table_name drop column c_n;
Create an index:
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 );
Delete an index:
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 statement:
Insert into table_name (c_1, c_2)
Values ('X1', 1 );
Update statement:
Update table_name set c_1 = 1 where c_2 = 3;
Delete a database or table:
Drop table table_name;
Drop database database_name; // data that can be deleted using mysql_drop_db.