mysql - 仅使用来自 TIMESTAMP SQL 的日期

Question

我使用选择命令来获取“created_at”。这是创建行的日期。命令的结果是 2018-07-29 15:29:57。我如何只显示日期并删除时间。

当前结果: 2018-07-29 15:29:57

期望的结果: 2018-07-29

SELECT treatment_log.created_at
FROM treatment_log
LEFT JOIN customers
    ON treatment_log.treatment_fk = customers.id
WHERE treatment_log.created_at = 
        (
            SELECT MAX(created_at)
            FROM treatment_log
            WHERE treatment_fk = ?
        )
    AND customers.id = ?

如何更改我当前的代码？

Answer 1

您好，下面是解决方案

SQL 服务器:

SELECT CAST(treatment_log.created_at as DATE)
FROM treatment_log
LEFT JOIN customers
    ON treatment_log.treatment_fk = customers.id
WHERE treatment_log.created_at = 
        (
            SELECT MAX(created_at)
            FROM treatment_log
            WHERE treatment_fk = ?
        )
    AND customers.id = ?

对于我的 SQL

SELECT DATE(treatment_log.created_at)
FROM treatment_log
LEFT JOIN customers
    ON treatment_log.treatment_fk = customers.id
WHERE treatment_log.created_at = 
        (
            SELECT MAX(created_at)
            FROM treatment_log
            WHERE treatment_fk = ?
        )
    AND customers.id = ?