DML

insert

delete

update

select

SELECT * FROM D;
insert into D(a,b,c,d,e) values(,,,);
insert into D(a,b,c,d,e) values(,,,),(,,,),(,,,),(,,,);

 

select*from information_schema.table_constraints
where constraint_schema=' ' and table_name=' ';

update C set c=' ' where a=' ';
delete from C where d='';

 

select[all|distinct] a from A
[where ]
[group by ] 
[having ]
[order by ]