delphi中dbchart 怎么让他获取表的行数 显示在Y轴

2025-05-14 17:10:12
推荐回答(1个)
回答1:

SQL语句就有问题
where后面time是条件,前面怎么能select SQL呢。。。
select time , count(*) as row from tablename group by time having time between '07:00:00' and '17:00:00'
这样是可以的