Mysql 从四个国家/地区代码列中至少有三个具有不同国家/地区代码计数的表中筛选记录_Mysql_Sql_Oracle

Mysql 从四个国家/地区代码列中至少有三个具有不同国家/地区代码计数的表中筛选记录

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Mysql 从四个国家/地区代码列中至少有三个具有不同国家/地区代码计数的表中筛选记录,mysql,sql,oracle,Mysql,Sql,Oracle,我有一个小问题 +----+---------------+--------------+---------------+--------------+ | ID | Country CodeR | CountryCodeB | CountryCodeBR | CountryCodeF | +----+---------------+--------------+---------------+--------------+ | 1 | US | US

我有一个小问题

+----+---------------+--------------+---------------+--------------+
| ID | Country CodeR | CountryCodeB | CountryCodeBR | CountryCodeF |
+----+---------------+--------------+---------------+--------------+
|  1 | US            | US           | US            | UK           |
|  2 | US            | UK           | US            | PK           |
|  3 | US            | UK           | PK            | IND          |
+----+---------------+--------------+---------------+--------------+

从上表从上表中筛选具有不同国家/地区代码列计数的记录（至少四分之三的国家/地区代码列）

从上表我需要的结果应该是如下所示

+----+---------------+--------------+---------------+--------------+
| ID | Country CodeR | CountryCodeB | CountryCodeBR | CountryCodeF |
+----+---------------+--------------+---------------+--------------+
|    |               |              |               |              |
|  2 | US            | UK           | US            | PK           |
|  3 | US            | UK           | PK            | IND          |
+----+---------------+--------------+---------------+--------------+

当前的数据结构使查询变得困难，因为count distinct函数对行而不是列进行操作。一种方法是将数据转换为高格式，然后按

ID

进行聚合：

SELECT t1.*
FROM yourTable t1
INNER JOIN
(
    SELECT ID
    FROM
    (
        SELECT ID, CountryCodeR AS CountryCode FROM yourTable
        UNION ALL
        SELECT ID, CountryCodeB FROM yourTable
        UNION ALL
        SELECT ID, CountryCodeBR FROM yourTable
        UNION ALL
        SELECT ID, CountryCodeF FROM yourTable
    ) t
    GROUP BY ID
    HAVING COUNT(DISTINCT CountryCode) >= 3
) t2
    ON t1.ID = t2.ID;

以上内容可能是您在MySQL上所能做的最好的。如果您使用的是Oracle，那么就可以使用unpivot和CTE等工具来创建外观更好的查询

当前的数据结构使查询变得困难，因为count distinct函数对行而不是列进行操作。一种方法是将数据转换为高格式，然后按

ID

进行聚合：

SELECT t1.*
FROM yourTable t1
INNER JOIN
(
    SELECT ID
    FROM
    (
        SELECT ID, CountryCodeR AS CountryCode FROM yourTable
        UNION ALL
        SELECT ID, CountryCodeB FROM yourTable
        UNION ALL
        SELECT ID, CountryCodeBR FROM yourTable
        UNION ALL
        SELECT ID, CountryCodeF FROM yourTable
    ) t
    GROUP BY ID
    HAVING COUNT(DISTINCT CountryCode) >= 3
) t2
    ON t1.ID = t2.ID;

以上内容可能是您在MySQL上所能做的最好的。如果您使用的是Oracle，那么就可以使用unpivot和CTE等工具来创建外观更好的查询

以下是几种不用旋转表格和自连接的方法：

在Oracle中，您可以将项目放入一个集合，然后使用

SET（）

获取唯一的项目，并使用

CARDINALITY

获取集合的大小：

Oracle 11g R2架构设置：

CREATE TABLE TABLE_NAME(
  ID,
  CountryCodeR,
  CountryCodeB,
  CountryCodeBR,
  CountryCodeF
) As
SELECT 1, 'US', 'US', 'US', 'UK' FROM DUAL UNION ALL
SELECT 2, 'US', 'UK', 'US', 'PK' FROM DUAL UNION ALL
SELECT 3, 'US', 'UK', 'PK', 'IND' FROM DUAL UNION ALL
SELECT 4, 'A', 'B', 'C', 'D' FROM DUAL UNION ALL
SELECT 5, 'A', 'B', 'C', 'A' FROM DUAL UNION ALL
SELECT 6, 'A', 'B', 'A', 'D' FROM DUAL UNION ALL
SELECT 7, 'A', 'A', 'C', 'D' FROM DUAL UNION ALL
SELECT 8, 'A', 'B', 'C', 'B' FROM DUAL UNION ALL
SELECT 9, 'A', 'B', 'B', 'D' FROM DUAL UNION ALL
SELECT 10, 'A', 'B', 'C', 'C' FROM DUAL UNION ALL
SELECT 11, 'A', 'B', 'B', 'A' FROM DUAL UNION ALL
SELECT 12, 'A', 'B', 'A', 'B' FROM DUAL UNION ALL
SELECT 13, 'A', 'A', 'C', 'C' FROM DUAL UNION ALL
SELECT 14, 'A', 'A', 'A', 'B' FROM DUAL UNION ALL
SELECT 15, 'A', 'A', 'B', 'A' FROM DUAL UNION ALL
SELECT 16, 'A', 'B', 'A', 'A' FROM DUAL UNION ALL
SELECT 17, 'A', 'B', 'B', 'B' FROM DUAL UNION ALL
SELECT 18, 'A', 'A', 'A', 'A' FROM DUAL
/

CREATE TYPE StringList IS TABLE OF VARCHAR2(5)
/

SELECT *
FROM   table_name
WHERE  CARDINALITY(
         SET(
           StringList(
             CountryCodeR,
             CountryCodeB,
             CountryCodeBR,
             CountryCodeF
           )
         )
       ) >= 3

| ID | COUNTRYCODER | COUNTRYCODEB | COUNTRYCODEBR | COUNTRYCODEF |
|----|--------------|--------------|---------------|--------------|
|  2 |           US |           UK |            US |           PK |
|  3 |           US |           UK |            PK |          IND |
|  4 |            A |            B |             C |            D |
|  5 |            A |            B |             C |            A |
|  6 |            A |            B |             A |            D |
|  7 |            A |            A |             C |            D |
|  8 |            A |            B |             C |            B |
|  9 |            A |            B |             B |            D |
| 10 |            A |            B |             C |            C |

| ID | COUNTRYCODER | COUNTRYCODEB | COUNTRYCODEBR | COUNTRYCODEF |
|----|--------------|--------------|---------------|--------------|
|  2 |           US |           UK |            US |           PK |
|  3 |           US |           UK |            PK |          IND |
|  4 |            A |            B |             C |            D |
|  5 |            A |            B |             C |            A |
|  6 |            A |            B |             A |            D |
|  7 |            A |            A |             C |            D |
|  8 |            A |            B |             C |            B |
|  9 |            A |            B |             B |            D |
| 10 |            A |            B |             C |            C |

查询1：

CREATE TABLE TABLE_NAME(
  ID,
  CountryCodeR,
  CountryCodeB,
  CountryCodeBR,
  CountryCodeF
) As
SELECT 1, 'US', 'US', 'US', 'UK' FROM DUAL UNION ALL
SELECT 2, 'US', 'UK', 'US', 'PK' FROM DUAL UNION ALL
SELECT 3, 'US', 'UK', 'PK', 'IND' FROM DUAL UNION ALL
SELECT 4, 'A', 'B', 'C', 'D' FROM DUAL UNION ALL
SELECT 5, 'A', 'B', 'C', 'A' FROM DUAL UNION ALL
SELECT 6, 'A', 'B', 'A', 'D' FROM DUAL UNION ALL
SELECT 7, 'A', 'A', 'C', 'D' FROM DUAL UNION ALL
SELECT 8, 'A', 'B', 'C', 'B' FROM DUAL UNION ALL
SELECT 9, 'A', 'B', 'B', 'D' FROM DUAL UNION ALL
SELECT 10, 'A', 'B', 'C', 'C' FROM DUAL UNION ALL
SELECT 11, 'A', 'B', 'B', 'A' FROM DUAL UNION ALL
SELECT 12, 'A', 'B', 'A', 'B' FROM DUAL UNION ALL
SELECT 13, 'A', 'A', 'C', 'C' FROM DUAL UNION ALL
SELECT 14, 'A', 'A', 'A', 'B' FROM DUAL UNION ALL
SELECT 15, 'A', 'A', 'B', 'A' FROM DUAL UNION ALL
SELECT 16, 'A', 'B', 'A', 'A' FROM DUAL UNION ALL
SELECT 17, 'A', 'B', 'B', 'B' FROM DUAL UNION ALL
SELECT 18, 'A', 'A', 'A', 'A' FROM DUAL
/

CREATE TYPE StringList IS TABLE OF VARCHAR2(5)
/

SELECT *
FROM   table_name
WHERE  CARDINALITY(
         SET(
           StringList(
             CountryCodeR,
             CountryCodeB,
             CountryCodeBR,
             CountryCodeF
           )
         )
       ) >= 3

| ID | COUNTRYCODER | COUNTRYCODEB | COUNTRYCODEBR | COUNTRYCODEF |
|----|--------------|--------------|---------------|--------------|
|  2 |           US |           UK |            US |           PK |
|  3 |           US |           UK |            PK |          IND |
|  4 |            A |            B |             C |            D |
|  5 |            A |            B |             C |            A |
|  6 |            A |            B |             A |            D |
|  7 |            A |            A |             C |            D |
|  8 |            A |            B |             C |            B |
|  9 |            A |            B |             B |            D |
| 10 |            A |            B |             C |            C |

| ID | COUNTRYCODER | COUNTRYCODEB | COUNTRYCODEBR | COUNTRYCODEF |
|----|--------------|--------------|---------------|--------------|
|  2 |           US |           UK |            US |           PK |
|  3 |           US |           UK |            PK |          IND |
|  4 |            A |            B |             C |            D |
|  5 |            A |            B |             C |            A |
|  6 |            A |            B |             A |            D |
|  7 |            A |            A |             C |            D |
|  8 |            A |            B |             C |            B |
|  9 |            A |            B |             B |            D |
| 10 |            A |            B |             C |            C |

：

CREATE TABLE TABLE_NAME(
  ID,
  CountryCodeR,
  CountryCodeB,
  CountryCodeBR,
  CountryCodeF
) As
SELECT 1, 'US', 'US', 'US', 'UK' FROM DUAL UNION ALL
SELECT 2, 'US', 'UK', 'US', 'PK' FROM DUAL UNION ALL
SELECT 3, 'US', 'UK', 'PK', 'IND' FROM DUAL UNION ALL
SELECT 4, 'A', 'B', 'C', 'D' FROM DUAL UNION ALL
SELECT 5, 'A', 'B', 'C', 'A' FROM DUAL UNION ALL
SELECT 6, 'A', 'B', 'A', 'D' FROM DUAL UNION ALL
SELECT 7, 'A', 'A', 'C', 'D' FROM DUAL UNION ALL
SELECT 8, 'A', 'B', 'C', 'B' FROM DUAL UNION ALL
SELECT 9, 'A', 'B', 'B', 'D' FROM DUAL UNION ALL
SELECT 10, 'A', 'B', 'C', 'C' FROM DUAL UNION ALL
SELECT 11, 'A', 'B', 'B', 'A' FROM DUAL UNION ALL
SELECT 12, 'A', 'B', 'A', 'B' FROM DUAL UNION ALL
SELECT 13, 'A', 'A', 'C', 'C' FROM DUAL UNION ALL
SELECT 14, 'A', 'A', 'A', 'B' FROM DUAL UNION ALL
SELECT 15, 'A', 'A', 'B', 'A' FROM DUAL UNION ALL
SELECT 16, 'A', 'B', 'A', 'A' FROM DUAL UNION ALL
SELECT 17, 'A', 'B', 'B', 'B' FROM DUAL UNION ALL
SELECT 18, 'A', 'A', 'A', 'A' FROM DUAL
/

CREATE TYPE StringList IS TABLE OF VARCHAR2(5)
/

SELECT *
FROM   table_name
WHERE  CARDINALITY(
         SET(
           StringList(
             CountryCodeR,
             CountryCodeB,
             CountryCodeBR,
             CountryCodeF
           )
         )
       ) >= 3

| ID | COUNTRYCODER | COUNTRYCODEB | COUNTRYCODEBR | COUNTRYCODEF |
|----|--------------|--------------|---------------|--------------|
|  2 |           US |           UK |            US |           PK |
|  3 |           US |           UK |            PK |          IND |
|  4 |            A |            B |             C |            D |
|  5 |            A |            B |             C |            A |
|  6 |            A |            B |             A |            D |
|  7 |            A |            A |             C |            D |
|  8 |            A |            B |             C |            B |
|  9 |            A |            B |             B |            D |
| 10 |            A |            B |             C |            C |

| ID | COUNTRYCODER | COUNTRYCODEB | COUNTRYCODEBR | COUNTRYCODEF |
|----|--------------|--------------|---------------|--------------|
|  2 |           US |           UK |            US |           PK |
|  3 |           US |           UK |            PK |          IND |
|  4 |            A |            B |             C |            D |
|  5 |            A |            B |             C |            A |
|  6 |            A |            B |             A |            D |
|  7 |            A |            A |             C |            D |
|  8 |            A |            B |             C |            B |
|  9 |            A |            B |             B |            D |
| 10 |            A |            B |             C |            C |

查询2：

CREATE TABLE TABLE_NAME(
  ID,
  CountryCodeR,
  CountryCodeB,
  CountryCodeBR,
  CountryCodeF
) As
SELECT 1, 'US', 'US', 'US', 'UK' FROM DUAL UNION ALL
SELECT 2, 'US', 'UK', 'US', 'PK' FROM DUAL UNION ALL
SELECT 3, 'US', 'UK', 'PK', 'IND' FROM DUAL UNION ALL
SELECT 4, 'A', 'B', 'C', 'D' FROM DUAL UNION ALL
SELECT 5, 'A', 'B', 'C', 'A' FROM DUAL UNION ALL
SELECT 6, 'A', 'B', 'A', 'D' FROM DUAL UNION ALL
SELECT 7, 'A', 'A', 'C', 'D' FROM DUAL UNION ALL
SELECT 8, 'A', 'B', 'C', 'B' FROM DUAL UNION ALL
SELECT 9, 'A', 'B', 'B', 'D' FROM DUAL UNION ALL
SELECT 10, 'A', 'B', 'C', 'C' FROM DUAL UNION ALL
SELECT 11, 'A', 'B', 'B', 'A' FROM DUAL UNION ALL
SELECT 12, 'A', 'B', 'A', 'B' FROM DUAL UNION ALL
SELECT 13, 'A', 'A', 'C', 'C' FROM DUAL UNION ALL
SELECT 14, 'A', 'A', 'A', 'B' FROM DUAL UNION ALL
SELECT 15, 'A', 'A', 'B', 'A' FROM DUAL UNION ALL
SELECT 16, 'A', 'B', 'A', 'A' FROM DUAL UNION ALL
SELECT 17, 'A', 'B', 'B', 'B' FROM DUAL UNION ALL
SELECT 18, 'A', 'A', 'A', 'A' FROM DUAL
/

CREATE TYPE StringList IS TABLE OF VARCHAR2(5)
/

SELECT *
FROM   table_name
WHERE  CARDINALITY(
         SET(
           StringList(
             CountryCodeR,
             CountryCodeB,
             CountryCodeBR,
             CountryCodeF
           )
         )
       ) >= 3

| ID | COUNTRYCODER | COUNTRYCODEB | COUNTRYCODEBR | COUNTRYCODEF |
|----|--------------|--------------|---------------|--------------|
|  2 |           US |           UK |            US |           PK |
|  3 |           US |           UK |            PK |          IND |
|  4 |            A |            B |             C |            D |
|  5 |            A |            B |             C |            A |
|  6 |            A |            B |             A |            D |
|  7 |            A |            A |             C |            D |
|  8 |            A |            B |             C |            B |
|  9 |            A |            B |             B |            D |
| 10 |            A |            B |             C |            C |

| ID | COUNTRYCODER | COUNTRYCODEB | COUNTRYCODEBR | COUNTRYCODEF |
|----|--------------|--------------|---------------|--------------|
|  2 |           US |           UK |            US |           PK |
|  3 |           US |           UK |            PK |          IND |
|  4 |            A |            B |             C |            D |
|  5 |            A |            B |             C |            A |
|  6 |            A |            B |             A |            D |
|  7 |            A |            A |             C |            D |
|  8 |            A |            B |             C |            B |
|  9 |            A |            B |             B |            D |
| 10 |            A |            B |             C |            C |

您还可以使用多个

CASE

语句：

SELECT *
FROM   table_name
WHERE  CASE
       WHEN CountryCodeR IN ( CountryCodeB, CountryCodeBR, CountryCodeF )
       THEN 1 ELSE 0
       END
       +
       CASE
       WHEN CountryCodeB IN ( CountryCodeBR, CountryCodeF )
       THEN 1 ELSE 0
       END
       +
       CASE
       WHEN CountryCodeBR IN ( CountryCodeF )
       THEN 1 ELSE 0
       END
       <= 1

这也适用于MySQL-

这里有几种方法可以做到这一点，而无需借助于数据透视表和自连接：