简体中文(ZH-CN) English(EN) 繁体中文(ZH-TW) 日本語(JA) 한국어(KO) Melayu(MS) Français(FR) Deutsch(DE)
Home > Database > Mysql Tutorial > body text

select-mysql查询count值查不出来，显示查询超时

WBOY
Release： 2016-06-06 09:43:13
Original
1700 people have browsed it

mysqlselect超时count

SELECT count(test.exam.id)
FROM test.exam
left join test.user
on test.exam.sfz=test.user.sfz
where test.user.area=13
查询不出来总数，最后会显示超时
每个表都有20万条左右数据

会查询600秒

Related labels：
mysql select 超时 count
source：php.cn
Previous article：duplicate-mysql存储过程报错,报的联合主键约束错误 Next article： mysql数字排序问题。
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
function_exists() cannot determine the custom function Function test () {return true;} if (function_exists ('test')) {echo "test is function...
From 2024-04-29 11:01:01
0
2
1457
How to display the mobile version of Google Chrome Hello teacher, how can I change Google Chrome into a mobile version?
From 2024-04-23 00:22:19
0
10
1622
The child window operates the parent window, but the output does not respond. The first two sentences are executable, but the last sentence cannot be implemented.
From 2024-04-19 15:37:47
0
1
1385
There is no output in the parent window document.onclick = function(){ window.opener.document.write('I am the output of the child ...
From 2024-04-18 23:52:34
0
1
1305
Where is the courseware about CSS mind mapping? Courseware
From 2024-04-16 10:10:18
0
0
1357
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn：Public welfare online PHP training，Help PHP learners grow quickly！