mysql - Mysql CAST（CONCAT_WS 试图获得正确的语法

Question

这有效

SELECT EntryId FROM 2_1_journal 
WHERE CAST(CONCAT_WS('-', RecordYear,RecordMonth,RecordDay) AS DATE) = ? 

但是之前想WHERE用列名定义日期的“虚拟”列名，例如RecordDate。

试过了

SELECT EntryId FROM 2_1_journal 
CAST(CONCAT_WS('-', RecordYear,RecordMonth,RecordDay) AS DATE) RecordDate 
WHERE RecordDate = ?


SELECT EntryId FROM 2_1_journal 
CAST(CONCAT_WS('-', RecordYear,RecordMonth,RecordDay) AS DATE) AS RecordDate 
WHERE RecordDate = ?


SELECT EntryId FROM 2_1_journal 
CAST((CONCAT_WS('-', RecordYear,RecordMonth,RecordDay) AS DATE) AS RecordDate) 
WHERE RecordDate = ?

在所有情况下都会出错Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'CAST。

请建议什么是正确的语法

Answer 1