The document contains two sections. The first section inserts multiple records simultaneously into the "ALUMNO" table using transactions. The second section deletes all records from the "ALUMNO" table, inserts records into the "ALUMNO", "MATERIA", and "ALUMNO_MATERIA" tables, and then displays a joined query of the "ALUMNO_MATERIA" table.

1. 1. INSERTA VARIOS REGISTROS DE MANERA SIMULTÁNEA EN LA TABLA
“ALUMNO”.
start transaction;
insert into alumno values('50','Eloy','Contreras','de Lira');
insert into alumno values('51','Juana','Guerrero','Torres');
commit;
begin;
insert into alumno values('50','Eloy','Contreras','de Lira');
insert into alumno values('51','Juana','Guerrero','Torres');
commit;
set autocommit=0;
insert into alumno values('50','Eloy','Contreras','de Lira');
insert into alumno values('51','Juana','Guerrero','Torres');
commit;
2. BORRA TODOS LOS REGISTROS PREVIOS DE LA TABLA “ALUMNO”.
INSERTA DOS REGISTRO EN LA TABLA “ALUMNO”. INSERTA DOS REGISTROS
EN LA TABLA “MATERIA”. INSERTA CUATRO REGISTROS EN LA TABLA
“ALUMNO_MATERIA”. MUESTRA LA TABLA “ALUMNO_MATERIA”
start transaction;
delete from alumno;
insert into alumno values('52','omar','hernandez','alvarez');
insert into alumno values('53','jimena','rodriguez','gomez');
insert into materia values('152','Matematicas');
insert into materia values('153','Bases de datos avanzadas');
insert into alumno_materia values('52','152','10');
insert into alumno_materia values('52','153','9');
insert into alumno_materia values('53','152','10');
insert into alumno_materia values('53','153','9');
select
ALUMNO.NOMBRE_ALUMNO,MATERIA.NOMBRE_MATERIA,ALUMNO_MATERIA.CALIF
ICACION FROM ALUMNO INNER JOIN ALUMNO_MATERIA INNER JOIN MATERIA
ON ALUMNO.ID_ALUMNO=ALUMNO_MATERIA.ID_ALUMNO AND
ALUMNO_MATERIA.ID_MATERIA=MATERIA.ID_MATERIA;
COMMIT;