Question

SIm是编码的新手，但我有一个MYSQL查询，它返回所需的信息，除了它将我的日期字段（d.timestart和d.timefinish）作为unixtimestamps返回。我知道我需要使用From Unixtime（），但我不知道如何插入它。

这是我的代码可以正常工作：）

SELECT g.quiz       AS'Quiz Number', 
       g.userid     AS'User Number', 
       g.grade      AS'Grade Percentage Achieved', 
       u.firstname  AS' First Name', 
       u.lastname   AS'Last Name', 
       c.name       AS'Assessment Name', 
       d.attempt    AS'Number of Attempts', 
       d.state      AS'Assessment Progress', 
       d.timestart  AS'Assessment Started', 
       d.timefinish AS'Assessment Finished' 
FROM   mdl_quiz_grades g 
       JOIN mdl_user u 
         ON u.id = g.userid 
       JOIN mdl_quiz c 
         ON c.id = g.quiz 
       JOIN mdl_quiz_attempts d 
         ON d.id = g.userid

谢谢Gary

Answer 1

您可以使用FROM_UNIXTIME：

SELECT g.quiz                      AS'Quiz Number', 
       g.userid                    AS'User Number', 
       g.grade                     AS'Grade Percentage Achieved', 
       u.firstname                 AS' First Name', 
       u.lastname                  AS'Last Name', 
       c.name                      AS'Assessment Name', 
       d.attempt                   AS'Number of Attempts', 
       d.state                     AS'Assessment Progress', 
       From_unixtime(d.timestart)  AS'Assessment Started', 
       From_unixtime(d.timefinish) AS'Assessment Finished' 
FROM   mdl_quiz_grades g 
       JOIN mdl_user u 
         ON u.id = g.userid 
       JOIN mdl_quiz c 
         ON c.id = g.quiz 
       JOIN mdl_quiz_attempts d 
         ON d.id = g.userid

如果您想格式化该日期，可以使用DATE_FORMAT和说明符从the documentation格式化。

DATE_FORMAT(FROM_UNIXTIME(d.timestart), '%b %d %Y %h:%i %p') AS ...

Answer 2

用于格式化unix时间戳，您可以尝试

SELECT FROM_UNIXTIME(unix_timestamp, '%m/%d/%Y') FROM myTable;

其中第二部分是格式字符串。

要格式化任何类型的日期和时间，您可以尝试DATE_FORMAT功能，例如

SELECT DATE_FORMAT(date, '%m/%d/%Y') FROM myTable;

无论如何看看
http://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_from-unixtime
和
http://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_date-format

Answer 3

MySQL documentation中有一些例子。

SELECT g.quiz       AS'Quiz Number', 
       g.userid     AS'User Number', 
       g.grade      AS'Grade Percentage Achieved', 
       u.firstname  AS' First Name', 
       u.lastname   AS'Last Name', 
       c.name       AS'Assessment Name', 
       d.attempt    AS'Number of Attempts', 
       d.state      AS'Assessment Progress', 
       FROM_UNIXTIME(d.timestart)  AS'Assessment Started', 
       FROM_UNIXTIME(d.timefinish) AS'Assessment Finished' 
FROM   mdl_quiz_grades g 
       JOIN mdl_user u 
         ON u.id = g.userid 
       JOIN mdl_quiz c 
         ON c.id = g.quiz 
       JOIN mdl_quiz_attempts d 
         ON d.id = g.userid

MYSQL查询将我的日期字段作为unixtimestamps返回。

3 个答案: