mysql時間字符串按年/月/天/時分組查詢 -- date_format

FROM test

GROUP BY DATE_FORMAT( deteline, "%Y-%m-%d %H" ) 

查詢某天：

deteline, "%Y-%m-%d"

某時：

deteline, "%Y-%m-%d %H"

依次類推。

其實就是對dateline進行處理，然后再對處理后的數據分組

 

eg:統計每小時創建的個數

SELECT DATE_FORMAT( create_time, "%Y-%m-%d %H" ) as time , COUNT( * ) as count FROM pdca GROUP BY DATE_FORMAT( create_time, "%Y-%m-%d %H" )

　

from sqlalchemy import func

with DBContext('w') as session:
    start_date = Common.get_month_and_day(day, '%Y-%m-%d 00:00:00')
    items = session.query(func.date_format(GitOperateLog.gol_datetime, '%Y-%m-%d'), func.count(GitOperateLog.gol_id)) \
        .filter(GitOperateLog.gol_jira_project == project_name) \
        .filter(GitOperateLog.gol_operate_code == GitOperateLogModel.GOL_OPERATE_CODE_MASTER_MERGE) \
        .filter(GitOperateLog.gol_datetime >= start_date) \
        .group_by(func.date_format(GitOperateLog.gol_datetime, '%Y-%m-%d')) \
        .all()
    items = {i[0]: i[1] for i in items}

　　

將時間格式化方法

func.date_format(Table.create_time, "%Y-%m-%d %H:%i:%s")

將時間戳轉化成時間

func.from_unixtime((Table.timestamp), "%Y-%m-%d %H:%i:%s")