SQL语句 比较麻烦的not exists 增加条件？

Question

SELECT * FROM table1
WHERE not exists (SELECT ph from table2
WHERE djlx = 'WGD' and table1.ph=table2.ph ) 
如果需要再增加两个条件 table1.xd <> 'XC' and table1.xd <> 'RK' 该怎么写