做题时,常常会用到查重操作,可以使用 STL 中的 map 与 unordered_map ,也可以使用 “平板电视” 中的 cc_hash_table 和 gp_hash_table 实现。 ## $\texttt{map}$ map 的内部实现是红黑树,插入、查找元素的时间复杂度都是 $O(\l
gp_hash_table<string,int> my_map;// 定义哈希表my_map["hello"] =1;// 插入键值对my_map["world"] =2;cout<< my_map["hello"] <<endl;// 查询键值对cout<< my_map["world"] <<endl;return0; }
update和delete是不更新bitmap 索引的,因此如果你要update或delete一个有bitmap索引的表的话,将需要rebuild。 REINDEX my_table; --重建my_table上的所有index REINDEX my_index; --重建my_index索引 DROP INDEX title_idx; --删除索引title_idx 13.GP支持分区表,主要用来存放大表,如fact table 目的:(1)把大...
NOTICE: CREATE TABLE will create implicit sequence "plt_id_seq" for serial column "plt.id" NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "plt_pkey" for table "plt" CREATE TABLE 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20....
My 2008 image is that of a 4thof July sparkler, so abrupt and dazzling at its ignition that it hurts the eyes before quickly going orange to gray to black. Lorenzo came up from the 250cc class and had the batteries to stick out his jaw at Valentino Fricking Rossi, one of the brightes...
nor the fatal injury suffered by Shoya Tomizawa in 2010 when his chest was crushed in a 250cc race in San Marino. At the time this article was posted, doctors were saying nothing more than Bagnaia’s legs suffered injuries necessitating a CT scan to determine the extent of the damage. Dur...
https://repo.anaconda.com/pkgs/main/linux-64/xz-5.4.2-h5eee18b_0.conda#bcd31de48a0dcb44bc5b99675800c5cc https://repo.anaconda.com/pkgs/main/linux-64/zlib-1.2.13-h5eee18b_0.conda#333e31fbfbb5057c92fa845ad6adef93 Expand Down Expand Up @@ -56,9 +56,8 @@ https://repo.anaconda....
How do I find many keys with the same value in a Hash Table? How do I find the last time a web site was accessed How do I get Email Addreses of Group members? how do I get multiple lines into a single cell (export-csv)? Truncating all but the first item How do I get the env...
我们的客户给我们提供了tiboot3.bin 和tifs.bin,这让设备系统能够起来,进入linux系统终端,但是相应的app均无法运行,包括ti基础的app程序。linux系统启动log如下: U-Boot SPL 2021.01-gd2bdf760-dirty (Dec 23 2022 - 11:05:16 +0800) Model: Texas Instruments K3 J721E SoC SYSFW ABI: 3.1 (firmware re...
mob64ca1419e0cc 7月前 56阅读 postgresql分分区表改分区表pgsql分区表 一、分区表在10版本前通过继承加上触发器实现分区表,步骤繁琐,10版本增加了内置分区,支持范围分区和列表分区。1.1分区表的意义降低大表管理成本和某些场景的性能提升。1.2 传统分区表传统分区表通过继承和触发器方式实现,其实现过程步骤多,非常...