1、增

insert?into?表 (列名,列名...)?values?(值,值,值...) insert?into?表 (列名,列名...)?values?(值,值,值...),(值,值,值...) insert?into?表 (列名,列名...)?select?(列名,列名...)?from?表

2、刪

delete?from?表 delete?from?表?where?id＝1?and?name＝'alex'

3、改

update?表?set?name?＝?'alex'?where?id>1

4、查

select?*?from?表 select?*?from?表?where?id > 1 select?nid,name,gender?as?gg?from?表?where?id > 1

5、其他

a、條件select * from 表 where id > 1 and name != 'alex' and num = 12;select * from 表 where id between 5 and 16;select * from 表 where id in (11,22,33)select * from 表 where id not in (11,22,33)select * from 表 where id in (select nid from 表)b、通配符select * from 表 where name like 'ale%' - ale開頭的所有（多個字符串）select * from 表 where name like 'ale_' - ale開頭的所有（一個字符）c、限制select * from 表 limit 5; - 前5行select * from 表 limit 4,5; - 從第4行開始的5行select * from 表 limit 5 offset 4 - 從第4行開始的5行d、排序select * from 表 order by 列 asc - 根據 “列” 從小到大排列select * from 表 order by 列 desc - 根據 “列” 從大到小排列select * from 表 order by 列1 desc,列2 asc - 根據 “列1” 從大到小排列，如果相同則按列2從小到大排序e、分組select num from 表 group by numselect num,nid from 表 group by num,nidselect num,nid from 表 where nid > 10 group by num,nid order nid descselect num,nid,count(*),sum(score),max(score),min(score) from 表 group by num,nidselect num from 表 group by num having max(id) > 10特別的：group by 必須在where之后，order by之前f、連表無對應關系則不顯示select A.num, A.name, B.namefrom A,BWhere A.nid = B.nid無對應關系則不顯示select A.num, A.name, B.namefrom A inner join Bon A.nid = B.nidA表所有顯示，如果B中無對應關系，則值為nullselect A.num, A.name, B.namefrom A left join Bon A.nid = B.nidB表所有顯示，如果B中無對應關系，則值為nullselect A.num, A.name, B.namefrom A right join Bon A.nid = B.nidg、組合組合，自動處理重合select nicknamefrom Aunionselect namefrom B組合，不處理重合select nicknamefrom Aunion allselect namefrom B

摘抄自：https://www.cnblogs.com/wupeiqi/articles/5713315.html

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