Loading...

mysql 查詢數據資料是否有重複

Temperature: 0 °C

Mark ChangMark Chang
author_tools


mysql 查詢數據資料是否有重複
有沒有試過資料庫裡上萬筆資料卻不知道是不是有重複的數據?

這時你一定要試試這個查詢方法~

//列出是否有重複的姓名
select name,count(*) as count from member_table group by name having count >1
//上列查詢是說要查詢member_table的表單裡有沒有name相同的數量是大於1的

 

https://innstory.com/story-mysql_查詢數據資料是否有重複-1602
Mysql

Prev
 西湖捷運站二樓真的是覓食的好地方

Next
PHP–implode_將陣列轉成字串 

About the Author

Mark Chang

離不開電腦的宅男

Visitor message

Leave some footprints to prove that you visited me

Recommended reading

Author's other related stories

PHP無法保存SESSION的問題

PHP無法保存SESSION...

一天,客戶反應系統後台無法登入。 而這問題是發生在客戶電腦更換了IP位置。 而我這邊也只是開放新的I...

PHP如何設定HTTP安全標頭?

PHP如何設定HTTP安全標...

PHP該如何將以下安全標頭添加到網站? XFrameOptions  防止點擊劫持攻擊 XXSSPr...

當域名 DNS 尚未生效時,如何預先設定及測試網站

當域名 DNS 尚未生效時,...

建置一個新的網站或是將網站搬家時 常常會遇到一個問題,就是要將網址指向到新的網站空間,設定完畢但需要...

Please select an option

error

Hi, thank you for your participation, but you cannot vote repeatedly~

Join innstory now and start recording your story.

"Innstory" is a place to store stories. We are committed to becoming a warm platform. Deepening the bonds between people is our direction.
We are convinced that the blockchain between people is not just a cold calculation. Join us now.

Wrong format