Simple implementation of Mysql add, delete, modify and query statements

insert into tablename(...) values(...)
//If the added record includes all columns, there is no need to write the data list insert into tablename values(...)

delete from tablename where condition ;

update tablename set xx=xx , xx=xx... where condition ;

alter table tablename set xx=xx , xx=xx... where condition ;

select (...) from tablename where condition ;

select * from tablename where condition ;

drop table tablename ;

alter table tablename add column columnname columntype ... ;

alter table tablename drop column columnname ;