哪些运算属于一级运算

页面:/news/view-2775024/ | 耗时:0.0292 s | 内存:1.89 MB | 查询:4 | 缓存读取:4 写入:0 | 加载文件:23
select * from tbl_Articles WHERE ArticleID=2775024 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2775024 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2775024 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(3360402,1645716,2412145,417511,2139891,2208010,1075710,977420,2059652,799303,1926019,2359145,1855033,1685359,196252,1012594,1506299,554196,1106725,1557962,1078735,1792325,1042718,2401461,1119329,1049816,1529056,294576,2312671,2736484) ORDER BY field (ArticleID,3360402,1645716,2412145,417511,2139891,2208010,1075710,977420,2059652,799303,1926019,2359145,1855033,1685359,196252,1012594,1506299,554196,1106725,1557962,1078735,1792325,1042718,2401461,1119329,1049816,1529056,294576,2312671,2736484)