Sql 使用逗号分隔的值从特定列获取所有不同的值

我正在创建一个sql查询。我尝试了stackoverflow中的多个链接，并用谷歌搜索了一下，但找不到解决方案。我有以下资料：

column_name
1,2,3,string1
3,1,string2
4,5,string3
2,4,string1

因此，我需要以下输出：

1,2,3,4,5,string1,string2,string3,string4

基本上，我想从逗号分隔的列中获取所有唯一的值。我知道distinct与列中的每一行相比给出不同的值，但在上述情况下，我们如何才能做到这一点

注意：我使用的是Oracle 11g数据库。Kaushik的答案在SQL Fiddler中看起来不错。但这对我不起作用，因为我有超过2万行。还有别的选择吗

---

？

您可以使用

regexp\u replace

删除重复项并将结果与

listag

SELECT 
       RTRIM(
         REGEXP_REPLACE(
           (listagg(Num,',') WITHIN GROUP (ORDER BY Num) OVER ()), 
           '([^,]*)(,\1)+($|,)', 
           '\1'),
         ',') Nums 
FROM Table;

---

您可以使用

regexp\u replace

删除重复项，并将结果与

listag

SELECT 
       RTRIM(
         REGEXP_REPLACE(
           (listagg(Num,',') WITHIN GROUP (ORDER BY Num) OVER ()), 
           '([^,]*)(,\1)+($|,)', 
           '\1'),
         ',') Nums 
FROM Table;

回答

回答

---

使用常规方法将单个字符串拆分为不同的行，然后连接。唯一的问题是连接的字符串不应该超过4000个字符

Oracle 11g R2架构设置：

CREATE TABLE yourtable
    (column_name varchar2(13))
;

INSERT ALL 
    INTO yourtable (column_name)
         VALUES ('1,2,3,string1')
    INTO yourtable (column_name)
         VALUES ('3,1,string2')
    INTO yourtable (column_name)
         VALUES ('4,5,string3')
    INTO yourtable (column_name)
         VALUES ('2,4,string1')
SELECT * FROM dual
;

select LISTAGG(val,',') WITHIN GROUP ( ORDER BY val ) as final
FROM
(
select distinct  trim(regexp_substr(column_name,'[^,]+', 1, level) ) as val 
  from yourtable
   connect by regexp_substr(column_name, '[^,]+', 1, level) is not null
  ORDER BY val
 )

|                             FINAL |
|-----------------------------------|
| 1,2,3,4,5,string1,string2,string3 |

查询1：

CREATE TABLE yourtable
    (column_name varchar2(13))
;

INSERT ALL 
    INTO yourtable (column_name)
         VALUES ('1,2,3,string1')
    INTO yourtable (column_name)
         VALUES ('3,1,string2')
    INTO yourtable (column_name)
         VALUES ('4,5,string3')
    INTO yourtable (column_name)
         VALUES ('2,4,string1')
SELECT * FROM dual
;

select LISTAGG(val,',') WITHIN GROUP ( ORDER BY val ) as final
FROM
(
select distinct  trim(regexp_substr(column_name,'[^,]+', 1, level) ) as val 
  from yourtable
   connect by regexp_substr(column_name, '[^,]+', 1, level) is not null
  ORDER BY val
 )

|                             FINAL |
|-----------------------------------|
| 1,2,3,4,5,string1,string2,string3 |

：

CREATE TABLE yourtable
    (column_name varchar2(13))
;

INSERT ALL 
    INTO yourtable (column_name)
         VALUES ('1,2,3,string1')
    INTO yourtable (column_name)
         VALUES ('3,1,string2')
    INTO yourtable (column_name)
         VALUES ('4,5,string3')
    INTO yourtable (column_name)
         VALUES ('2,4,string1')
SELECT * FROM dual
;

select LISTAGG(val,',') WITHIN GROUP ( ORDER BY val ) as final
FROM
(
select distinct  trim(regexp_substr(column_name,'[^,]+', 1, level) ) as val 
  from yourtable
   connect by regexp_substr(column_name, '[^,]+', 1, level) is not null
  ORDER BY val
 )

|                             FINAL |
|-----------------------------------|
| 1,2,3,4,5,string1,string2,string3 |

---

使用常规方法将单个字符串拆分为不同的行，然后连接。唯一的问题是连接的字符串不应该超过4000个字符

Oracle 11g R2架构设置：

CREATE TABLE yourtable
    (column_name varchar2(13))
;

INSERT ALL 
    INTO yourtable (column_name)
         VALUES ('1,2,3,string1')
    INTO yourtable (column_name)
         VALUES ('3,1,string2')
    INTO yourtable (column_name)
         VALUES ('4,5,string3')
    INTO yourtable (column_name)
         VALUES ('2,4,string1')
SELECT * FROM dual
;

select LISTAGG(val,',') WITHIN GROUP ( ORDER BY val ) as final
FROM
(
select distinct  trim(regexp_substr(column_name,'[^,]+', 1, level) ) as val 
  from yourtable
   connect by regexp_substr(column_name, '[^,]+', 1, level) is not null
  ORDER BY val
 )

|                             FINAL |
|-----------------------------------|
| 1,2,3,4,5,string1,string2,string3 |

查询1：

CREATE TABLE yourtable
    (column_name varchar2(13))
;

INSERT ALL 
    INTO yourtable (column_name)
         VALUES ('1,2,3,string1')
    INTO yourtable (column_name)
         VALUES ('3,1,string2')
    INTO yourtable (column_name)
         VALUES ('4,5,string3')
    INTO yourtable (column_name)
         VALUES ('2,4,string1')
SELECT * FROM dual
;

select LISTAGG(val,',') WITHIN GROUP ( ORDER BY val ) as final
FROM
(
select distinct  trim(regexp_substr(column_name,'[^,]+', 1, level) ) as val 
  from yourtable
   connect by regexp_substr(column_name, '[^,]+', 1, level) is not null
  ORDER BY val
 )

|                             FINAL |
|-----------------------------------|
| 1,2,3,4,5,string1,string2,string3 |

：

CREATE TABLE yourtable
    (column_name varchar2(13))
;

INSERT ALL 
    INTO yourtable (column_name)
         VALUES ('1,2,3,string1')
    INTO yourtable (column_name)
         VALUES ('3,1,string2')
    INTO yourtable (column_name)
         VALUES ('4,5,string3')
    INTO yourtable (column_name)
         VALUES ('2,4,string1')
SELECT * FROM dual
;

select LISTAGG(val,',') WITHIN GROUP ( ORDER BY val ) as final
FROM
(
select distinct  trim(regexp_substr(column_name,'[^,]+', 1, level) ) as val 
  from yourtable
   connect by regexp_substr(column_name, '[^,]+', 1, level) is not null
  ORDER BY val
 )

|                             FINAL |
|-----------------------------------|
| 1,2,3,4,5,string1,string2,string3 |

---

---

我删除了不兼容的数据库标记。请仅标记您真正使用的数据库。谢谢@GordonLinoff@a_horse_with_no_name甲骨文11g。将在问题中更新。逗号分隔的项目。会给你带来很多麻烦…它们总是数字还是字符串？我删除了不兼容的数据库标签。请仅标记您真正使用的数据库。谢谢@GordonLinoff@a_horse_with_no_name甲骨文11g。将在问题中更新。逗号分隔的项目。这会给您带来很多麻烦…它们总是数字还是字符串？问题是它们使用的是Oracle 11g。此解决方案在Oracle上不起作用。您只需进行快速搜索，以找到如何将其转换为Oracle：问题表明他们正在使用Oracle 11g。此解决方案在Oracle上不起作用。您只需进行快速搜索，以找到如何将其转换为Oracle：这正是我想要的，但由于我有更多的结果（超过19k个结果），我认为这需要花费太多时间。有没有其他更快的解决方案@考希克Nayak@test帐户：更好的解决方案是，通过遵循规范化规则，更改表/架构设计，并将值存储为具有适当键的行。这正是我想要的，但由于我有更多的结果（超过19k个结果），我认为这需要太多时间。有没有其他更快的解决方案@考希克Nayak@test帐户：更好的解决方案是，通过遵循规范化规则，更改表/模式设计，并使用适当的键将值存储为行。