Method getPrimaryKey

src/java/simpledb/common/Catalog.java:188–195

(int tableid)

    }

    public String getPrimaryKey(int tableid) {
        // some code goes here
        Table table = this.getTableById(tableid);
        if(table!=null){
            return table.getPkeyField();
        }
        return null;
    }

    public Iterator<Integer> tableIdIterator() {
        // some code goes here