创建附注标签$ git tag -a v5.6.31 -m “php 5.6.31”
推送本地的TAG到远程git push -v origin refs/tags/v5.6.31
查看、添加、提交、删除、找回,重置修改文件
git help # 显示command的help
git show # 显示某次提交的内容 git show $id
git co – # ...
创建附注标签$ git tag -a v5.6.31 -m “php 5.6.31”
推送本地的TAG到远程git push -v origin refs/tags/v5.6.31
查看、添加、提交、删除、找回,重置修改文件
git help # 显示command的help
git show # 显示某次提交的内容 git show $id
git co – # ...
Flow Control Statements
MySQL supports the IF, CASE, ITERATE, LEAVE LOOP, WHILE, and REPEAT constructs for flow control within stored programs. It also supports RETURN within store...
1.对查询进行优化,应尽量避免全表扫描,首先应考虑在 where 及 order by 涉及的列上建立索引。
2.应尽量避免在 where 子句中对字段进行 null 值判断,否则将导致引擎放弃使用索引而进行全表扫描,如:select id from t where num is null可以在num上设置默认值0,确保表中num列没有null值,然后这样查询:selec...
Software engineers go crazy for the most ridiculous things. We like to think that we’re hyper-rational, but when we have to choose a technology, we end up in a kind of frenzy — bouncing f...