MySQL筆記之基本查詢的應(yīng)用詳解_MySQL教程
推薦：mysql密碼過期導(dǎo)致連接不上mysqlmysql密碼過期了，今天遇到了連接mysql，總是連接不上去,下面有兩種錯(cuò)誤現(xiàn)象，有類似問題的朋友可以參考看看，或許對你有所幫助
參考表：student
多字段查詢
復(fù)制代碼 代碼如下:www.ghpqjb.com
mysql> select id,name,birth from student;
所有字段查詢
復(fù)制代碼 代碼如下:www.ghpqjb.com
mysql> select * from student;
where指定查詢
復(fù)制代碼 代碼如下:www.ghpqjb.com
mysql> select * from student where id=901;
mysql> select * from student where id>=904;
mysql> select name from student where department='計(jì)算機(jī)系';
in指定集合查詢
復(fù)制代碼 代碼如下:www.ghpqjb.com
mysql> select * from student where birth in(1988,1990);
mysql> select * from student where id in(903,906);
not in非范圍查詢
復(fù)制代碼 代碼如下:www.ghpqjb.com
mysql> select * from student where birth not in(1990,1998);
between and指定范圍查詢
復(fù)制代碼 代碼如下:www.ghpqjb.com
mysql> select * from student where birth between 1986 and 1988;
not between and不在指定范圍的查詢
復(fù)制代碼 代碼如下:www.ghpqjb.com
mysql> select * from student where id not between 904 and 906;
like字符串匹配查詢
復(fù)制代碼 代碼如下:www.ghpqjb.com
mysql> select * from student where name like '_三';
mysql> select * from student where name like '張三';
mysql> select * from student where name like '張%';
not like不匹配查詢
復(fù)制代碼 代碼如下:www.ghpqjb.com
mysql> select * from student where name not like '張%';
null查詢
復(fù)制代碼 代碼如下:www.ghpqjb.com
mysql> select * from student where address is null;
and多條件查詢
復(fù)制代碼 代碼如下:www.ghpqjb.com
mysql> select * from student where name like '張%' and birth>1985;
mysql> select * from student where name like '張%' and birth>1985 and id like '%3';
or多條件查詢
復(fù)制代碼 代碼如下:www.ghpqjb.com
mysql> select * from student where id=905 or birth=1988;
mysql> select * from student where id=905 or birth=1988 or sex='女';
distinct查詢結(jié)果不重復(fù)
復(fù)制代碼 代碼如下:www.ghpqjb.com
mysql> select distinct sex from student;
mysql> select distinct department from student;
order by查詢結(jié)果排序
復(fù)制代碼 代碼如下:www.ghpqjb.com
mysql> select * from student order by birth;
mysql> select * from student order by birth asc;
mysql> select * from student order by birth desc;
group by分組查詢
復(fù)制代碼 代碼如下:www.ghpqjb.com
mysql> select sex,group_concat(name) from student group by sex;
mysql> select sex,count(name) from student group by sex;
正則表達(dá)式查詢
復(fù)制代碼 代碼如下:www.ghpqjb.com
mysql> select * from student where birth regexp '1988|1990';
limit限制查詢結(jié)果數(shù)量
復(fù)制代碼 代碼如下:www.ghpqjb.com
mysql> select * from student limit 2;
mysql> select * from student limit 1,3;
分享：MySQL筆記之索引的使用索引是創(chuàng)建在表上的，對數(shù)據(jù)庫表中一列或多列的值進(jìn)行排序的一種結(jié)構(gòu)其作用主要在于提高查詢的速度，降低數(shù)據(jù)庫系統(tǒng)的性能開銷
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MySQL教程-MySQL筆記之基本查詢的應(yīng)用詳解
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