Problem do not select

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Problem do not select

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#1 by (1 votes)

1

How to solve this?

create table tbl_prescricao(
id_prescricao int not null primary key auto_increment,
tipo_prescricao varchar(250) not null,
valor_prescricao decimal(10,2)
);

create table tbl_juntaprescricao(
id_junta int not null primary key auto_increment,
prescricao int not null,
constraint fk_prescricao foreign key (prescricao) references tbl_prescricao 
(id_prescricao),
prescricao2 int,
constraint fk_prescricao2 foreign key (prescricao2) references 
tbl_prescricao (id_prescricao)
);

insert into tbl_prescricao values
(1, 'Remédio 1', 59.00),
(2, 'Remédio 2', 80.00),
(3, 'Remédio 3', null);

insert into tbl_juntaprescricao values (1, 1, 2), (2, 3, null);

select tipo_prescricao from tbl_juntaprescricao as J
inner join tbl_prescricao as P on J.prescricao = P.id_prescricao
inner join tbl_prescricao as P on J.prescricao2 = P.id_prescricao;

When making the select the error occurs: Error Code: 1066. Not unique table / alias: 'P'

I need it to bring the name of the drugs in the tbl_juntaprescricao table.

If I was not specific with the problem ask me more details.

mysql

asked by anonymous 24.09.2017 / 23:06

1 answer

Reference error: Variable was not defined Successful Toast Dialogue on Submitting Form with PHP

score 1 · Accepted Answer

The alias has to be unique. In the last lines make the following change:

select P.tipo_prescricao, P2.tipo_prescricao from tbl_juntaprescricao as J
inner join tbl_prescricao as P on J.prescricao = P.id_prescricao
inner join tbl_prescricao as P2 on J.prescricao2 = P2.id_prescricao;