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No column name was specified for column

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No column name was specified for column xx

报错语句示例:

select * FROM (

select d.dept_name,count(1) from sys_dept d GROUP BY d.dept_name

) as temp

报错原因:

因为加了临时表(新表),所以要指出新表的每一列的列名,例子中应该为count(1)定义别名

正确写法:

select * FROM (

select d.dept_name,count(1) as count from sys_dept d GROUP BY d.dept_name

) as temp


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