2024每日刷题(189)
Leetcode—193. 有效电话号码 实现代码
# Read from the file file.txt and output all valid phone numbers to stdout.
grep -e "^[0-9]\{3\}\-[0-9]\{3\}\-[0-9]\{4\}$" -e "^([0-9]\{3\}) [0-9]\{3\}\-[0-9]\{4\…
问题:
SQL语句中包含order by排序的取前n行的分页查询语句,如何优化?
select object_name from
(select object_name from t1018 where object_typeTABLE order by created)
where rownum<5;
测试分析:
1.创建测试表
cre…