mysql - Using aliases names of columns in where clause

Question

I have given a alis name for all my fields in the select clause. I am not able to use these names in my where clause.

I tried to use having clause, but it takes more time then usual where clause. Is there any solution for this ?

Answer 1

你有两个选择，

WHERE一、在子句中使用整个表达式，

SELECT Hello, 
       DATE(CURDATE()) cur_date
FROM   tableName
WHERE  DATE(CURDATE()) >= CURDATE + INTERVAL 1 DAY

或两个，将其包装在子查询中

SELECT *
FROM
       (
           SELECT Hello, 
                  DATE(CURDATE()) cur_date
           FROM   tableName
       ) subAlias
WHERE  cur_date >= CURDATE + INTERVAL 1 DAY