Amit Bera Amit Bera - 6 days ago 5
MySQL Question

Mysql error: violation: 1052 Column 'created_at' in where clause is ambiguous'

I am getting the issue:

Integrity constraint violation: 1052 Column 'created_at' in where clause is ambiguous'

but the table

sales_flat_order_grid
have
created_at
Column

SELECT DISTINCT main_table.*,
blacklist.entity_id AS marked
FROM sales_flat_order_grid AS main_table
LEFT JOIN (SELECT main_table.*
FROM plugincompany_blacklist_item AS main_table
WHERE ( order_id != '0' )
GROUP BY order_id) AS blacklist
ON main_table.entity_id = blacklist.order_id
WHERE ( created_at >= '2016-11-03 00:00:00'
AND created_at <= '2016-11-26 23:59:59' )

Seb Seb
Answer

Both tables have a created_at clause. So mysql does not know which one to take. You need to be clear about that:

WHERE  ( main_table.created_at >= '2016-11-03 00:00:00' 
     AND main_table.created_at <= '2016-11-26 23:59:59' ) 
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