repeated.sql · jiaxiuc123/python-learn

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python-learn

repeated.sql

repeated.sql 1.16 KB

CREATE TABLE tf_user(
ID NUMBER(14),
NAME VARCHAR2(255),
email VARCHAR2(255)
);

Insert into TF_USER
 (ID, NAME, EMAIL)
 Values
 (1, 'chengwei', 'chengwei@tencent.com.cn');
Insert into TF_USER
 (ID, NAME, EMAIL)
 Values
 (2, 'lizm', 'lizm@tencent.com.cn');
Insert into TF_USER
 (ID, NAME, EMAIL)
 Values
 (3, 'changhj', 'changhj@tencent.com.cn');
Insert into TF_USER
 (ID, NAME, EMAIL)
 Values
 (4, 'wujun', 'wujun@tencent.com.cn');
Insert into TF_USER
 (ID, NAME, EMAIL)
 Values
 (5, 'mmtye', 'mmtye@tencent.com.cn');
Insert into TF_USER
 (ID, NAME, EMAIL)
 Values
 (6, 'guona', 'guona@tencent.com.cn');
Insert into TF_USER
 (ID, NAME, EMAIL)
 Values
 (7, 'chengwei', 'chengwei@tencent.com.cn');
Insert into TF_USER
 (ID, NAME, EMAIL)
 Values
 (8, 'guona', 'guona@tencent.com.cn');
Insert into TF_USER
 (ID, NAME, EMAIL)
 Values
 (9, 'mmtye', 'mmtye@tencent.com.cn');
Insert into TF_USER
 (ID, NAME, EMAIL)
 Values
 (10, 'chengwei', 'chengwei@tencent.com.cn');

-- 一条语句删除name重复的记录
DELETE FROM tf_user WHERE ROWID NOT IN(
SELECT b.rod from (
SELECT MIN(ROWID) rod, NAME FROM tf_user a
GROUP BY NAME) b);

SELECT * from tf_user;

Copy Edit Raw Blame History

faker authored 2014年02月28日 18:49 +08:00 . 删除重复记录的一种方法

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55

CREATE TABLE tf_user(
ID NUMBER(14),
NAME VARCHAR2(255),
email VARCHAR2(255)
);

Insert into TF_USER
 (ID, NAME, EMAIL)
 Values
 (1, 'chengwei', 'chengwei@tencent.com.cn');
Insert into TF_USER
 (ID, NAME, EMAIL)
 Values
 (2, 'lizm', 'lizm@tencent.com.cn');
Insert into TF_USER
 (ID, NAME, EMAIL)
 Values
 (3, 'changhj', 'changhj@tencent.com.cn');
Insert into TF_USER
 (ID, NAME, EMAIL)
 Values
 (4, 'wujun', 'wujun@tencent.com.cn');
Insert into TF_USER
 (ID, NAME, EMAIL)
 Values
 (5, 'mmtye', 'mmtye@tencent.com.cn');
Insert into TF_USER
 (ID, NAME, EMAIL)
 Values
 (6, 'guona', 'guona@tencent.com.cn');
Insert into TF_USER
 (ID, NAME, EMAIL)
 Values
 (7, 'chengwei', 'chengwei@tencent.com.cn');
Insert into TF_USER
 (ID, NAME, EMAIL)
 Values
 (8, 'guona', 'guona@tencent.com.cn');
Insert into TF_USER
 (ID, NAME, EMAIL)
 Values
 (9, 'mmtye', 'mmtye@tencent.com.cn');
Insert into TF_USER
 (ID, NAME, EMAIL)
 Values
 (10, 'chengwei', 'chengwei@tencent.com.cn');


-- 一条语句删除name重复的记录
DELETE FROM tf_user WHERE ROWID NOT IN(
SELECT b.rod from (
SELECT MIN(ROWID) rod, NAME FROM tf_user a
GROUP BY NAME) b);

SELECT * from tf_user;