sql 多个字段分组,删除重复记录,保留ID最小的一条

IF OBJECT_ID(cardDetail) IS NOT NULL 
  DROP TABLE cardDetail
 CREATE TABLE cardDetail
 (
 id INT IDENTITY(1,1) PRIMARY KEY,
 cardNO VARCHAR(8),
 NAME VARCHAR(30),   
 idCard VARCHAR(18),
 cardState CHAR(1)--卡片状态 1正常 2注销
 )
  INSERT cardDetail(cardNO,NAME,idCard,cardState)
 VALUES
 (001,张三,31010,1),
 (005,张三,31010,1),
 (002,李四,31011,1),
 (003,王五,31012,1),
 (006,张三,31010,0),
 (004,王五,31012,1),
 (007,欧阳,31013,1),
 (008,欧阳,31013,1) 

--SQL编写要求 
 --根据idcard,cardstate分组后删除重复的,使其保留id最小的记录
 
 --最终结果为:
 (1,‘001‘,‘张三‘,‘31010‘,1),
 (4,‘003‘,‘王五‘,‘31012‘,1),
 (7,‘007‘,‘欧阳‘,‘31013‘,1),

解决

with t as 
(
   select id,cardNO,NAME,idCard,cardState,
      row_number() over (partition by idcard,cardstate order by id) as od
   from cardDetail
)
select * from t where od = 1;

 

sql 多个字段分组,删除重复记录,保留ID最小的一条

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