Sql查詢 一個表中某欄位的資料在另一個表中某欄位中不存在的

比如：cdr表中的CallerId欄位中資料在station表中num不存在的 
sql語句 

SELECT CallerId 
FROM ast_cdr 
WHERE CallerId NOT IN (SELECT number FROM ast_station)  

加上條件 並 CallerId 欄位 去重複

SELECT DISTINCT CallerId 
FROM ast_cdr 
WHERE CallerId NOT IN (SELECT number FROM ast_station) and StartTime>='2024-02-01 00:00:00' and EndTime<='2024-02-29 23:59:59' and CallType='outbound'