Question

我有点像SQL的新手，但是一直在使用SQLFiddle来改进它。如果您想查找并列出所有具有在不同表中共享的公共列或列的表（例如，表1,2,3和4具有客户字段，而表2和4具有学生，该怎么办？你怎么用MySQL做到这一点？假设你有100多个表而不是2个。

E.g。

Table 1:

ID | Customer | Pet |

Table 2:

ID | Customer | Food | Student |

Table 3:

ID | Customer | Activity |

Table 4:

ID | Customer | Cost | Student

预期结果：

Table_NAME |的 COLUMN_NAME

Table 1, Table 2, Table 3, Table 4 | ID

Table 1, Table 2, Table 3, Table 4 | CUSTOMER

Table 2, Table 4 | Student

我试过以下两个并没有给我我想要的东西：

select Table_NAME, COLUMN_NAME, Count(*)
from INFORMATION_SCHEMA.columns
GROUP BY Table_NAME
HAVING COUNT(*) > 1


SELECT Table_Name, Column_Name
FROM INFORMATION_SCHEMA.columns
WHERE TABLE_NAME IN
(     SELECT TABLE_NAME
      FROM INFORMATION_SCHEMA.columns
      GROUP BY TABLE_NAME
      HAVING COUNT(*) > 1
 )
 ORDER BY TABLE_NAME

Answer 1

尝试：

select GROUP_CONCAT(TABLE_NAME) TABLE_NAME, COLUMN_NAME
from INFORMATION_SCHEMA.COLUMNS
GROUP BY COLUMN_NAME
HAVING COUNT(*) > 1

上面的查询将提供数据库中所有模式的表/列信息。

如果要将数据限制为特定模式，则<; p>

select GROUP_CONCAT(TABLE_NAME) TABLE_NAME, COLUMN_NAME
from INFORMATION_SCHEMA.COLUMNS
where TABLE_SCHEMA = 'your_schema'
GROUP BY COLUMN_NAME
HAVING COUNT(*) > 1

列出共享完全相同列名的所有表

1 个答案: