如何查询time字段每隔30(s)段的sum值,也就是汇总30s内多条数据为一条?
表结构: +----------------+--------------+ | time | num | +----------------+--------------+ | 1256278360 | 10000000 | | 1256278370 | 10000000 | | 1256278380 | 10000000 | | 1256278390 | 10000000 | | 1256278480 | 10000000 | | 1256278490 | 10000000 | | 1256278580 | 10000000 | | 1256278590 | 10000000 | | 1256278600 | 10000000 | | 1256278670 | 10000000 | | 1256278680 | 10000000 | | 1256278690 | 10000000 | | 1256279810 | 10000000 | | 1256279820 | 10000000 | | 1256279830 | 10000000 | | 1256279840 | 10000000 | 如何查询time字段每隔30(s)段的sum值,也就是汇总30s内多条数据为一条? 解决办法:select sum(`num`) from table_name group by floor(`time`/30); |