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Select/update table where trigger against, ORA-04091 error occurs
CREATE OR REPLACE
TRIGGER udpate_sheet_processing 
AFTER INSERT ON sheet_item 
FOR EACH ROW


DECLARE
    PRAGMA AUTONOMOUS_TRANSACTION;  -- 自治事務 
    v_sheet_id VARCHAR2(50);
    v_processing_entry NUMBER(5);
    CURSOR get_processing_amount IS
        SELECT count(*)+1
        FROM sheet_item
        WHERE sheet_id = v_sheet_id
    ;
    
BEGIN
    v_sheet_id := :NEW.sheet_id;

    OPEN get_processing_amount;
    FETCH get_processing_amount INTO v_processing_entry;
    CLOSE get_processing_amount;

    UPDATE product_checksheet
    SET sheet_processing_entry = v_processing_entry
    WHERE sheet_id = v_sheet_id;
    
    COMMIT;  -- commit for update
END;