How many WHEREs do we need in minimun when we have 4 FROMs in the statement

How many WHEREs do we need in minimun when we have 4 FROMs <tables> in the statement?

Technically none - but it produces cartesian join:
SQL> SELECT * FROM scott.emp, scott.dept, scott.salgrade;
     EMPNO ENAME      JOB               MGR HIREDATE        SAL       COMM
    DEPTNO     DEPTNO DNAME          LOC                GRADE      LOSAL
     HISAL
      7788 SCOTT      ANALYST          7566 87/04/19       3000
        20         40 OPERATIONS     BOSTON                 3       1401
      2000
      7839 KING       PRESIDENT             81/11/17       5000
        10         40 OPERATIONS     BOSTON                 3       1401
      2000
     EMPNO ENAME      JOB               MGR HIREDATE        SAL       COMM
    DEPTNO     DEPTNO DNAME          LOC                GRADE      LOSAL
     HISAL
280 wierszy zosta│o wybranych.

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How many WHEREs do we need in minimun when we have 4 FROMs in the statement

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