搜索列名，而不是整个数据库SQL

Question

SELECT something 
FROM table1, table2, table 
WHERE tableColumn = "tableName" 

Answer 1

你可以做一些疯狂，复杂的关于模式的表，如果有必要，但这应该在紧要关头：

select <something> 
    from table1 
    where 
     tableColumn = "tableName" 
union all 
select <something> 
    from table2 
    where 
     tableColumn = "tableName" 
union all 
select <something> 
    from table3 
    where 
     tableColumn = "tableName" 

只要确保从联合中的每个查询中选择相同类型的列。