年度博客排行
-
第1名
青否云后端云 -
第2名
zw7534313 -
第3名
wy_19921005 - 大家都说我很棒
- gengyun12
- e_e
- zysnba
- luxurioust
- robotmen
- 宏天软件
- gashero
- jywhltj
- vipbooks
- hbxflihua
- qepwqnp
- 解宜然
- fantaxy025025
- wallimn
- sichunli_030
- javashop
- ssydxa219
- ranbuijj
- gdpglc
- jickcai
- appalese
- gaojingsong
- java-007
- tanling8334
- gaozzsoft
- benladeng5225
- weiyides
- xyuma
- sam123456gz
- zhangyi0618
- hanbaohong
- laiyangdeli
- johnsmith9th
- liunancun
- xpenxpen
- ouanui
- panshunchang
- nychen2000
- 龙哥IT
- jveqi
- jh108020
- conkeyn
- wjianwei666
- 狂盗一枝梅
- lzyfn123
- bsszds
最新文章列表
mysql删除重复记录
我要删除的是url这个字段里面重复的记录,你可以根据自己的需求来替换。
DELETE FROM v9_spider WHERE url IN (SELECT * FROM ( SELECT url FROM v9_spider GROUP BY url HAVING COUNT( * )>1) b WHERE v9_spider.url=b.url) AND id NOT IN (SEL ...
oracle查询重复记录
1.操作单个字段:
a.查询出表中单个字段的重复记录.
SELECT * FROM aj_xyrxx t1 WHERE t1.ajbh IN
(SELECT t2.ajbh FROM aj_xyrxx t2
GROUP BY t2.ajbh HAVING COUNT(t2.ajbh) > 1) ;
b.删除单个字段重复的记录,只保 ...