不显示某字段有重复的记录 SQL语句

详细解释下需求：

    根据某字段（此例中为StateProvinceID）做判断，如果发现表中该字段有重复值，则结果不显示该条记录。

一，最直接的方法，效率低

SELECT * FROM 
 (
        SELECT StateProvinceID FROM
        (
            SELECT COUNT(*) AS num ,ad.StateProvinceID 
                FROM Person.Address ad 
                  GROUP BY StateProvinceID
         )AS tt
         WHERE tt.num<2  --排除重复
     ) AS tab
   INNER JOIN Person.Address addr ON tab.StateProvinceID=addr.StateProvinceID

二、使用了CTE

with t1
 AS(
    SELECT 
    * FROM Person.Address --WHERE AddressID<200
  ),
     t2 
  AS(
    SELECT 
    COUNT(*) AS num ,
    t1.StateProvinceID 
    FROM t1 
    GROUP BY StateProvinceID
    )
SELECT * FROM T2 
   INNER JOIN T1 ON t2.StateProvinceID = t1.StateProvinceID
  WHERE t2.num<2

三、最终版

 with  t2 
  AS(
    SELECT 
    COUNT(*) AS num ,
    t1.StateProvinceID 
    FROM Person.Address t1
    GROUP BY StateProvinceID
    )  
SELECT * FROM 
(
  SELECT T2.StateProvinceID  FROM t2 WHERE num<2
  ) AS T3
INNER JOIN Person.Address t1 ON T3.StateProvinceID=t1.StateProvinceID

还听到有人说可以写个func来判断存临时表，本人没有测试，在此没有列出。