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alter table nama_tabel change nama_kolom_lama nama_kolom_baru varchar(50);
>menghapus field/kolom
alter table name_table drop nama_kolom;
>Untuk menambah field diawal
alter table (nama table) add no_urut int(2) first;
>menambah field baru
alter table nama tabel add nama_kolom varchar(50);
>menghapus record
delete from nama_tabel where kondisi;
>mengupdate data
update nama_tabel set nama_kolom where kondisi;
>mengubah nama tabel
rename table nama_table to nama_baru;
>Untuk mengubah nulL
alter table (nama table) modify nm_brg char(25) not null;
>Untuk memberi kunci primary pada key
alter table (nama table) add primary key (rak);
>Untuk memberi kunci kedua pada key
alter table (nama table) add unique key (rak);
>Untuk mengubah default
alter table (nama table) alter jns_barang set default "makanan";
>Untuk mengganti nama dalam data
update barang set nm_brg='mie sedap' where kd_brg='INOOI';
>Untuk perkalian
select (tarif*jml_pakai) as tot_bayar from rek_listrik;
>select nama, max(tarif*jml_pakai) as jml_pembayaranfrom rek_listrik;
>select nama,(tarif*jml_pakai) as jml_pembayaran from rek_listrik order by nama desc limit 1;
>select*from barang,
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