两列，相同数据，不同子句

Question

I'm needing to query the same column with two different WHERE clause statements.

I'm working with Magento and I'm unable to change the table format.

Table View: catalog_product_entity_varchar

entity_id | attribute_id | value                |
5         | 60           | Bear Apprentice      |
5         | 86           | bear-apprentice      |
5         | 71           | Item Description     |
5         | 74           | /a/p/apprentice2.jpg |

I would like to have it displayed as:

entity_id | Item Name            |  img                   |
5         |  Bear Apprentice     | /a/p/apprentice2.jpg   |

Ultimately getting attribute_id 60 and 74 to appear on the same row but in two separate columns. Is it possible to do a WHERE clause on a column alias?

Thanks!

Answer 1

In mySQL one way to pivot is to use case and max and group by . This does assume an entity_Id can only have one paired value (1 attribute per value per entity) eg 60 can only appear once for entity 5.

SELECT entity_ID
     , max(case when attribute_Id = 60 then value end) as `Item Name`
     , max(case when attribute_Id = 74 then value end) as img
FROM tableName
WHERE entity_ID = 5
GROUP BY entity_ID