MYSQL的降序排列
今天查詢時需要用到降序排列，老是出錯，仔細檢查SQL語法也沒問題，
後來才知道，原來order by要放在limit的前面。或者說limit要放在最後。
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[sql]
String sql = "select * from s_dayreport " +
"where userId = "+userId+" " +
"order by taskDate desc " +
"limit "+firstResult+","+maxResults+" ";
