select count(*), sum(p1),vin from tj23 as a where EXISTS(select null from bak1 as b where a.vin = b. ...
SQL:select count ,sum p ,sum p ,vin from tj where inday between sstart and send and type rand.nextInt group by vin order by sum p desc limit 個並發:Thread Thread , ,main gt Mon Nov : : CST Mon Nov : : CS ...
2021-11-08 10:11 0 98 推薦指數:
select count(*), sum(p1),vin from tj23 as a where EXISTS(select null from bak1 as b where a.vin = b. ...
by sum(p1) desc limit 13 ; 從10億條中每次隨機取3000萬數據排序: 50個 ...
select inday,sum(p1),count(*) from tj23 as a where inday between '"+sstart+"' and '"+send+"' group by inday limit 150個並發:Thread[Thread-40,5,main ...
SQL:select a.tid,count(*),sum(std_mileage) from kudu_via_city_pdi3 as a where entry_time between "+e ...
1399 git clone https://github.com/VirusTotal/c-vtapi.git 1400 cd c-vtapi/ 1402 sudo apt-get ...
大數據量的查詢,不僅查詢速度非常慢,而且還會導致數據庫經常宕機(剛接到這個項目時候,數據庫經常宕機o(╯□╰)o)。 那么,如何處理上億級的數據量呢?如何從數據庫經常宕機到上億數據秒查?僅以此篇文章作為處理的總結。 數據背景:下面是存放歷史數據表的數據量,數據量確實很大,3億多條。但這也僅僅是 ...
數據准備: 一、基本查詢 語法: 查詢類型:match_all,match,term,range,fuzzy,bool 等等 查詢條件:查詢條件會根據類型的不同,寫法也有差異 1.1 查詢所有(match_all) 查詢指令 ...
數據查詢 基本查詢 方法find():查詢 db.集合名稱.find({條件文檔}) 方法findOne():查詢,只返回第一個 db.集合名稱.findOne({條件文檔}) 方法pretty():將結果格式化 ...