JOIN table, receiving NULL answers - mysql

Question

I have a problem on a script I'm writing and I don't know where I'm wrong.
I have multiple tables that are being filled from some txt files.
Afterwards I ALTER a table adding a column that must be filled from the result of a JOIN with two other tables.
More specific in my current db I'm trying to insert in table 2 the id of the doctors that are currently in table 1 and 2. One table contains the id and name, and the 2nd the name.
Running this script:
insert into Intermediara.id_provizoriumed
select Medici.id_medic is not null
FROM Medici
LEFT Join Intermediara
ON Medici.Nume COLLATE utf8_romanian_ci =Intermediara.NumeMedic;
or
Insert into Intermediara(id_provizoriumed)
Select DISTINCT Pacienti.Id_pacient
FROM Pacienti
left JOIN Intermediara
ON Pacienti.NumePacient COLLATE utf8_romanian_ci = Intermediara.NumePacient;
will result me in NULL answers;
Any ideas, please? :<
*More info on the project intself:
I'm using a procedure to create the tables:
delimiter $$
CREATE PROCEDURE init()
begin
CREATE TABLE Medici (
Nume VARCHAR(50),
Prenume VARCHAR(225),
Statut ENUM ('primar', 'specialist'),
Specialitate VARCHAR(20),
UNIQUE (Nume, Prenume)) DEFAULT CHARACTER SET utf8 COLLATE utf8_romanian_ci;
ALTER TABLE Medici ADD COLUMN Id_medic int AUTO_INCREMENT PRIMARY KEY;
ALTER TABLE Medici ADD COLUMN Tip ENUM ('primar', 'specialist') AFTER Prenume;
ALTER TABLE Medici DROP COLUMN Statut;
DESCRIBE Medici;
CREATE TABLE Pacienti (
Id_pacient int AUTO_INCREMENT NOT NULL PRIMARY KEY,
NumePacient VARCHAR(50),
PrenumePacient VARCHAR(100),
UNIQUE (NumePacient, PrenumePacient))DEFAULT CHARACTER SET utf8 COLLATE utf8_romanian_ci;
DESCRIBE Pacienti;
CREATE TABLE Cabinete (
Id_cabinet int AUTO_INCREMENT NOT NULL PRIMARY KEY,
Denumire VARCHAR(50),
UNIQUE (Denumire));
DESCRIBE Cabinete;
CREATE TABLE Vizite (
IntervalData DATETIME,
id_m int,
id_p int,
id_Cab int,
FOREIGN KEY (id_m) REFERENCES Medici(Id_medic),
FOREIGN KEY (id_p) REFERENCES Pacienti(Id_pacient),
FOREIGN KEY (id_Cab) REFERENCES Cabinete(Id_cabinet)
);
DESCRIBE Vizite;
CREATE TABLE Intermediara (
DataVizita VARCHAR(50),
OraIntrare TIME,
NumePacient VARCHAR(50),
PrenumePacient VARCHAR(50),
NumeMedic VARCHAR(50),
PrenumeMedic VARCHAR(50),
Cabinet VARCHAR(50)) DEFAULT CHARACTER SET utf8 COLLATE utf8_romanian_ci;
DESCRIBE Intermediara;
end$$
delimiter ;
Afterwards I'm loading the data in the tables Medici and Intermediara;
Then adding the info I need in:
INSERT IGNORE INTO Pacienti(NumePacient, PrenumePacient) SELECT NumePacient, PrenumePacient FROM Intermediara;
INSERT IGNORE INTO Cabinete(Denumire) SELECT Cabinet FROM intermediara;
And then what I'm trying to do is to add in Intermediara after adding:
ALTER TABLE Intermediara add column id_provizoriumed int collate utf8_romanian_ci;
ALTER TABLE Intermediara add column id_provizoriupac int collate utf8_romanian_ci;
ALTER TABLE Intermediara add column id_provizoriucab int collate utf8_romanian_ci;
to add the id from Medici (id_medic) in Intermediara by doing a JOIN having Medici.Nume and Intermediara.NumeMedic in the tables, the id must be distinct;