Sql 不是重复的吗?这个会杀死我表中的所有值@哈斯基:嗯,如果所有的数据都是重复的,那么它确实会删除所有的数据。看到对问题的评论说其中一行应该保留,意味着另一行按顺序编辑它。新版本应该满足您的要求。当val1和val2相等时,使用ID列保留其中一行。不,我希望删
Sql 不是重复的吗?这个会杀死我表中的所有值@哈斯基:嗯,如果所有的数据都是重复的,那么它确实会删除所有的数据。看到对问题的评论说其中一行应该保留,意味着另一行按顺序编辑它。新版本应该满足您的要求。当val1和val2相等时,使用ID列保留其中一行。不,我希望删,sql,oracle,plsql,toad,Sql,Oracle,Plsql,Toad,不是重复的吗?这个会杀死我表中的所有值@哈斯基:嗯,如果所有的数据都是重复的,那么它确实会删除所有的数据。看到对问题的评论说其中一行应该保留,意味着另一行按顺序编辑它。新版本应该满足您的要求。当val1和val2相等时,使用ID列保留其中一行。不,我希望删除重复项-这意味着1-3保留,3-1将被删除。由于JOIN,Oracle语法无效。需要一个子查询来选择要删除的行。您能告诉我CREATE TABLE t(ID INTEGER、val1 INTEGER、val2 INTEGER、val3 INT
不是重复的吗?这个会杀死我表中的所有值@哈斯基:嗯,如果所有的数据都是重复的,那么它确实会删除所有的数据。看到对问题的评论说其中一行应该保留,意味着另一行按顺序编辑它。新版本应该满足您的要求。当val1和val2相等时,使用ID列保留其中一行。不,我希望删除重复项-这意味着1-3保留,3-1将被删除。由于JOIN,Oracle语法无效。需要一个子查询来选择要删除的行。您能告诉我CREATE TABLE t(ID INTEGER、val1 INTEGER、val2 INTEGER、val3 INTEGER)相同问题的源代码吗;请我不知道该怎么处理。。。!规则是什么?例如,1,1,2和1,2,1和2,1,1一样吗?更像是1-2-3和3-2-1和1-3-2和2-3-1和2-1-3和。。。
ID | Val1 | Val2
---------------------
1 | 1 | 2
2 | 1 | 3
3 | 2 | 1
4 | 2 | 3
5 | 3 | 1
6 | 3 | 2
select * from YourTable t1
where not exists (select * from YourTable t2
where t1.Val1 = t2.Val2
and t1.Val2 = t2.Val1)
DELETE
T1
FROM
My_Table T1
INNER JOIN My_Table T2 ON
T2.val1 = T1.val2 AND
T2.val2 = T1.val2 AND
WHERE
T1.val1 < T1.val2
delete from YourTable
where (Val1, Val2)
in (select Val2, Val1 from YourTable where Val1 > Val2)
DELETE t
WHERE ID IN
(SELECT t1.id
FROM t t1 JOIN t t2
ON (t1.val1 = t2.val2 AND
t1.val2 = t2.val1 AND
t1.id < t2.id));
SQL> CREATE TABLE t (ID INTEGER, val1 INTEGER, val2 INTEGER);
Table created
SQL> INSERT INTO t VALUES(1,1,2);
1 row inserted
SQL> INSERT INTO t VALUES(2,1,3);
1 row inserted
SQL> INSERT INTO t VALUES(3,2,1);
1 row inserted
SQL> INSERT INTO t VALUES(4,2,3);
1 row inserted
SQL> INSERT INTO t VALUES(5,3,1);
1 row inserted
SQL> INSERT INTO t VALUES(6,3,2);
1 row inserted
SQL> INSERT INTO t VALUES(7,4,4);
1 row inserted
SQL> INSERT INTO t VALUES(8,4,4);
1 row inserted
SQL> SELECT * FROM t;
ID VAL VAL
--- --- ---
1 1 2
2 1 3
3 2 1
4 2 3
5 3 1
6 3 2
7 4 4
8 4 4
8 rows selected
SQL> DELETE t
2 WHERE ID IN (SELECT t1.id
3 FROM t t1 JOIN t t2 ON (t1.val1 = t2.val2 AND t1.val2 = t2.val1 AND t1.id < t2.id));
4 rows deleted
SQL> SELECT * FROM t;
ID VAL VAL
--- --- ---
3 2 1
5 3 1
6 3 2
8 4 4
SQL>
DELETE t
WHERE ID IN
(SELECT t1.id
FROM t t1 JOIN t t2
ON (t1.val1 = t2.val2 AND
t1.val2 = t2.val1 AND
(t2.val1 < t1.val1 OR (t2.val1 = t1.val1 AND t2.id > t1.id))));
CREATE TABLE t (ID INTEGER, val1 INTEGER, val2 INTEGER, val3 INTEGER);
INSERT INTO t VALUES (1, 1, 2, 3);
INSERT INTO t VALUES (2, 1, 3, 2);
INSERT INTO t VALUES (3, 2, 1, 3);
INSERT INTO t VALUES (4, 2, 3, 1);
INSERT INTO t VALUES (5, 3, 1, 2);
INSERT INTO t VALUES (6, 3, 2, 1);
INSERT INTO t VALUES (7, 1, 2, 4);
INSERT INTO t VALUES (8, 1, 3, 5);
INSERT INTO t VALUES (9, 1, 4, 2);
INSERT INTO t VALUES (10, 1, 1, 1);
INSERT INTO t VALUES (11, 1, 1, 1);
INSERT INTO t VALUES (12, 1, 3, 5);
SQL> select * from t order by id;
ID VAL VAL VAL
--- --- --- ---
1 1 2 3
2 1 3 2
3 2 1 3
4 2 3 1
5 3 1 2
6 3 2 1
7 1 2 4
8 1 3 5
9 1 4 2
10 1 1 1
11 1 1 1
12 1 3 5
12 rows selected
DELETE FROM t
WHERE ID IN (SELECT t1.ID FROM t t1 JOIN t t2 ON (t1.val1 = t2.val1 AND
t1.val2 = t2.val2 AND
t1.val3 = t2.val3 AND t1.id < t2.id)
UNION ALL
SELECT t1.ID FROM t t1 JOIN t t2 ON (t1.val1 = t2.val1 AND
t1.val2 = t2.val3 AND
t1.val3 = t2.val2 AND t1.id < t2.id)
UNION ALL
SELECT t1.ID FROM t t1 JOIN t t2 ON (t1.val1 = t2.val2 AND
t1.val2 = t2.val1 AND
t1.val3 = t2.val3 AND t1.id < t2.id)
UNION ALL
SELECT t1.ID FROM t t1 JOIN t t2 ON (t1.val1 = t2.val2 AND
t1.val2 = t2.val3 AND
t1.val3 = t2.val1 AND t1.id < t2.id)
UNION ALL
SELECT t1.ID FROM t t1 JOIN t t2 ON (t1.val1 = t2.val3 AND
t1.val2 = t2.val1 AND
t1.val3 = t2.val2 AND t1.id < t2.id)
UNION ALL
SELECT t1.ID FROM t t1 JOIN t t2 ON (t1.val1 = t2.val3 AND
t1.val2 = t2.val2 AND
t1.val3 = t2.val1 AND t1.id < t2.id));
select * from t order by id;
ID VAL VAL VAL
--- --- --- ---
6 3 2 1
9 1 4 2
11 1 1 1
12 1 3 5