MySQL Trigger After Insert Value on Another Table - mysql

Question

I have a table with a list of my cellphone contacts this is the structure of contacts table.
And the other one is smartteleco table.
The ContactId of smartteleco table is FOREIGN KEY to the ContactId of contacts.
I'm creating a trigger that if I INSERT a value into contacts table and the ContactNumber1 value starts with 0918,0919,0920,0921 it will be stored in the CellNumber field of smartteleco table.
These are the triggers I've already tried but there is a syntax error and the error is always inside the IF STATEMENT.
CREATE TRIGGER addSmart
AFTER INSERT ON contacts
FOR EACH ROW
BEGIN
IF(substring(ContactNumber1,1,4) IN (0918,0919,0920,0921) = 1)
SET CellNumber = substring(ContactNumber1,1,11);
END IF;
END
CREATE TRIGGER addSmart
AFTER INSERT ON contacts
FOR EACH ROW
BEGIN
IF(substring(ContactNumber1,1,4) IN (0918,0919,0920,0921) = 1)
INSERT INTO smartteleco (CellNumber) VALUES (ContactNumber1);
END IF;
END
CREATE TRIGGER addSmart
AFTER INSERT ON contacts
FOR EACH ROW
BEGIN
IF(substring(ContactNumber1,1,4) IN (0918,0919,0920,0921) = 1)
INSERT INTO smartteleco (NEW.CellNumber) VALUES (NEW.ContactNumber1);
END IF;
END
CREATE TRIGGER addSmart
AFTER INSERT ON contacts
FOR EACH ROW
BEGIN
IF(substring(ContactNumber1,1,4) IN (0918,0919,0920,0921) = 1)
SET CellNumber = ContactNumber1;
END IF;
END
CREATE TRIGGER addSmart
AFTER INSERT ON contacts
FOR EACH ROW
BEGIN
IF(substring(ContactNumber1,1,4) IN (0918,0919,0920,0921) = 1)
SET NEW.CellNumber = NEW.ContactNumber1;
END IF;
END

Answer 1

A row trigger cannot directly access the columns of the table to which it is attached. It can access the values in the newly-inserted record by using the pseudorecord NEW. To make your triggers work, just replace the references to ContactNumber1 with references to NEW.ContactNumber1.
You also need to use the correct syntax for your IF structures, which is
IF <contition> THEN --< You need this keyword
<statement>
END IF;
You might also need to cast ContactNumber1 as CHAR to use substring() on it.
So the correct trigger syntax should be
CREATE TRIGGER addSmart
AFTER INSERT ON contacts
FOR EACH ROW
BEGIN
IF(substring(CAST(NEW.ContactNumber1 AS CHAR(11)), 1, 4) IN ('0918', '0919', '0920' ,'0921'))
THEN
INSERT INTO smartteleco (ContactId, CellNumber)
VALUES (NEW.ContactId, NEW.ContactNumber1);
END IF;
END
EDIT: Syntax corrected. I also discovered that you will need to change the column ContactNumber1 from INT(11) to CHAR(11), which is actually the preferred data type since you will never be performing arithmetic on a phone number.

Answer 2

Try this:
BEGIN
IF SUBSTRING(NEW.ContactNumber1,1,4) IN ('0918','0919','0920','0921') THEN
INSERT INTO smartteleco (CellNumber) VALUES (NEW.ContactNumber1);
END IF;
END