SELECT * FROM visits GROUP by clientID ORDER BY 'date' LIMIT $from,$to
我想只获得每个客户的第一次访问(按时间顺序)并对结果进行分页.
如果我使用$from = 6,$to = 12进行此查询,则返回8行而不是7行.
我做错了什么？
最佳答案
来自MysqL的
LIMIT条款文档
The LIMIT clause can be used to constrain the number of rows returned by the SELECT statement. LIMIT takes one or two numeric arguments,which must both be nonnegative integer constants (except when using prepared statements).
With two arguments,the first argument specifies the offset of the first row to return,and the second specifies the maximum number of rows to return. The offset of the initial row is 0 (not 1).
当你选择$from 6和$to 12;你不是从6到12选择;你将从$1 = 7开始选择12行.