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    <p>This is propably solution:</p> <p>I tested it with this sample tables:</p> <pre><code>CREATE TABLE CLAN_AFFILIATI(CLAN VARCHAR2(100),AFFILIATO VARCHAR2(100),RUOLO VARCHAR2(100)); CREATE TABLE CLAN (NOME VARCHAR2(100) ,NUMAFFILIATI NUMBER(10)); </code></pre> <p>You need this helper package.</p> <pre><code>CREATE OR REPLACE PACKAGE STORE_NOMES AS TYPE record_nomes IS RECORD ( nome VARCHAR2(100), operation VARCHAR2(100) -- insert or delete ); TYPE array_type_nomes IS TABLE OF record_nomes INDEX BY BINARY_INTEGER; g_array_nomes array_type_nomes; END STORE_NOMES; / </code></pre> <p>Trigger on CLAN table:</p> <pre><code>CREATE OR REPLACE TRIGGER MODIFICANUMAFFILIATI BEFORE INSERT OR UPDATE OF NUMAFFILIATI ON CLAN FOR EACH ROW DECLARE l_CONT NUMBER:=0; BEGIN IF INSERTING THEN -- prevent inserting &lt;&gt; 0 IF :new.NUMAFFILIATI &lt;&gt; 0 THEN RAISE_APPLICATION_ERROR(-20016,'NUMERO ERRATO'); END IF; ELSE SELECT COUNT(*) INTO l_CONT FROM CLAN_AFFILIATI WHERE CLAN = :old.NOME; IF l_CONT &lt;&gt; :new.NUMAFFILIATI THEN RAISE_APPLICATION_ERROR(-20017,'NUMERO ERRATO'); END IF; END IF; END; / </code></pre> <p>Before statement trigger on CLAN_AFFILIATI table:</p> <pre><code>CREATE OR REPLACE TRIGGER TRG_CLAN_AFFILIATI_BEFORE_STMT BEFORE INSERT OR DELETE ON CLAN_AFFILIATI DECLARE BEGIN STORE_NOMES.g_array_nomes.DELETE; END; / </code></pre> <p>After statement trigger on CLAN_AFFILIATI table:</p> <pre><code>CREATE OR REPLACE TRIGGER TRG_CLAN_AFFILIATI_AFTER_STMT AFTER INSERT OR DELETE ON CLAN_AFFILIATI DECLARE BEGIN FOR i IN STORE_NOMES.g_array_nomes.FIRST..STORE_NOMES.g_array_nomes.LAST LOOP IF(STORE_NOMES.g_array_nomes(i).operation = 'INSERTING') THEN UPDATE CLAN SET NUMAFFILIATI=NUMAFFILIATI+1 WHERE NOME = STORE_NOMES.g_array_nomes(i).NOME; ELSIF(STORE_NOMES.g_array_nomes(i).operation = 'DELETING') THEN UPDATE CLAN SET NUMAFFILIATI=NUMAFFILIATI-1 WHERE NOME = STORE_NOMES.g_array_nomes(i).NOME; END IF; END LOOP; END; / </code></pre> <p>Row Insert/Delete trigger on CLAN_AFFILIATI table:</p> <pre><code>CREATE OR REPLACE TRIGGER AGGIORNAMENTONUMAFFILIATI BEFORE INSERT OR DELETE ON CLAN_AFFILIATI FOR EACH ROW DECLARE l_CLAN_APPARTENENZA VARCHAR(20); BEGIN IF INSERTING THEN SELECT NOME INTO l_CLAN_APPARTENENZA FROM CLAN WHERE NOME = :new.CLAN; STORE_NOMES.g_array_nomes(STORE_NOMES.g_array_nomes.COUNT).nome := :new.CLAN; STORE_NOMES.g_array_nomes(STORE_NOMES.g_array_nomes.LAST).operation := 'INSERTING'; ELSE SELECT NOME INTO l_CLAN_APPARTENENZA FROM CLAN WHERE NOME = :old.CLAN; STORE_NOMES.g_array_nomes(STORE_NOMES.g_array_nomes.COUNT).nome := :old.CLAN; STORE_NOMES.g_array_nomes(STORE_NOMES.g_array_nomes.LAST).operation := 'DELETING'; END IF; END; / </code></pre> <p>Now working this (without ORACLE-EXCEPTION):</p> <pre><code>INSERT INTO CLAN(NOME, NUMAFFILIATI) VALUES('Antonio', 0); INSERT INTO CLAN_AFFILIATI(CLAN,AFFILIATO,RUOLO) values('Antonio','Affiliato1','Ruolo1'); INSERT INTO CLAN_AFFILIATI(CLAN,AFFILIATO,RUOLO) values('Antonio','Affiliato2','Ruolo2'); </code></pre>
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    1. POproblem with trigger in oracle
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    1. USMartin Mares
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    1. COthanks for your answer you have been very kind, almost everything works perfectly, the only problem is the cancellation, ie NUMAFFILIATI is not updated if a row is deleted from CLAN_AFFILIATI
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    2. COFIRST - is raised trigger "TRG_CLAN_AFFILIATI_BEFORE_STMT" - Oracle raise it before any data manipulation in the table. This is place, where you must clear array(STORE_NOMES.g_array_nomes) - otherwise it will not work. SECOND - is raised Trigger "AGGIORNAMENTONUMAFFILIATI", there is a place, where stored NOMES in array(STORE_NOMES.g_array_nomes) and its operations(INSERT or DELETE). THIRD (and last) is raised after statement trigger "TRG_CLAN_AFFILIATI_AFTER_STMT", which Oracle rised after everything DML(data-manupilation) is done. This is the place, where you can call update on CLAN table.
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    3. COOracle TYPE STORE_NOMES.g_array_nomes is similar to MEMORY (remembers what names and what operations were performed).
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