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Home/ Questions/Q 6659265
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Editorial Team
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Editorial Team
Asked: May 26, 20262026-05-26T02:00:47+00:00 2026-05-26T02:00:47+00:00

I’m trying to use a trigger defined as follows — the table CREATE TABLE

  • 0

I’m trying to use a trigger defined as follows

-- the table
CREATE TABLE codici_ddt(
id_ordine VARCHAR(15) NOT NULL,
id_invoice VARCHAR(15) NOT NULL,
ddt_numero INT(8) NOT NULL,
fatturazione DATE NOT NULL,
ddt VARCHAR(20) NOT NULL,
FOREIGN KEY(id_ordine) REFERENCES ordini_dal_web(id_ordine),
PRIMARY KEY(id_ordine)
);

--the_trigger

DELIMITER $$

CREATE TRIGGER genera_numero_ddt BEFORE INSERT ON codici_ddt FOR EACH ROW
BEGIN
  DECLARE ultimo_ddt INT(8);
  
  SELECT COALESCE(max(ddt_numero),1) INTO ultimo_ddt 
  FROM codici_ddt
  WHERE data_fatturazione >= MAKEDATE(YEAR(NEW.data_fatturazione)  ,1) 
    AND data_fatturazione <  MAKEDATE(YEAR(NEW.data_fatturazione)+1,1);

  SET NEW.ddt_numero = (ultimo_ddt+1)
  SET NEW.ddt = CONCAT(NEW.ddt_numero,'/',(SUBSTRING(SUBSTRING_INDEX(NEW.data_fatturazione,'-',1),-2)),'c');
 END $$

DELIMITER ;

the message returned from mysql is

1064 – You have an error in your SQL syntax; check the manual that

corresponds to your MySQL server version for the right syntax to use
near ‘SET NEW.ddt =
CONCAT(NEW.ddt_numero,’/’,(SUBSTRING(SUBSTRING_INDEX(NEW.data_fatt’ at
line 11

the CONCAT should be right, where is my error?

many thanks!

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1 Answer

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  1. Editorial Team
    Editorial Team
    2026-05-26T02:00:48+00:00Added an answer on May 26, 2026 at 2:00 am

    You miss ‘;’ at the end of line.

      SET NEW.ddt_numero = (ultimo_ddt+1);
    
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