MySQL語句綜合整理
進入bin，啟動資料庫 mysqld
mysql -u root –p 進入資料庫
***** 密碼
show databases; 檢視資料庫
create databaseaaa; 建立資料庫
use aaa; 進入資料庫
show tables; 查看錶
create tableAAA(id int not null auto_increment ,欄位 資料型別 約束,....,primarykey(id))default charset=utf8
desc AAA; 查詢屬性欄位
insert into AAA(欄位1,欄位2.....) values (值1,值2....); 插入資料
delete from AAAwhere id =1; 刪除資料
alter table AAAadd (column) name varchar(255); 增加列
update AAA setname='lisi' where id = 2; 修改列
alter table AAAdrop column name; 刪除列屬性
alter table AAAadd constraint primary key id; 設定主鍵
alter table AAAchange id idd int; 改列名
alter table AAArename to BBB; 表名重新命名
alter table AAAmodify name text; 修改列屬性
alter table AAAdrop index name; 刪除索引
drop index nameon AAA; 刪除索引
alter table AAAadd index name約束名(name列名); 增加索引（約束）
select * fromAAA; 查詢全部
select * fromAAA where name='John'; 查詢名字是約翰的所有資料
select * fromAAA where name like '%n%'; 查詢名字含有n的人
select * fromAAA where name regexp 'n'; 查詢名字含有n的人
regexp '^N' （N開頭） regexp 'B$' （B結尾）
*（前面欄位、資料0次或以上） +（一次或多次） |（或者）
name regexp(Amy|John) 名字叫**或**
name in(Amy,John) 名字叫**或**
selectgender,count(*) from AAA group by gender havinggander = 'male'; 只查男生性別分組計數
select * from AAAorder by (age,height,id) desc; 查詢所有資訊（年齡，身高，id依次）降序
子查詢eg：AAA BBB id gender='male' 擬的兩張表
select name fromAAA where id in (select id from BBB where gender='male');
=any()
=some()
select (selectid from AAA) from BBB;
連線查詢join inner join
and
select name fromAAA join BBB onAAA.id=BBB.id where socre=96;
select * fromAAA left join BBB onAAA.id=BBB.id;
select * fromAAA right join BBB onAAA.id=BBB.id;
AAA id 1 zhangsan
2 lisi
BBB id 1 96
1 87
2 60
3 89
select * fromAAA,BBB where AAA.id=BBB.id and other-condition;
selectgender,count(1) from AAA group by gender having gender='male' union(distinct) select gender,count(1) from BBB groupby gender having gender='female';
select id fromAAA union all select id from BBB;
and or
select * fromAAA where grade between 60 and 90;
select * fromAAA where grade <>100;
grade !=100;
show createtable AAA;
1、查詢表中多餘的重複記錄，重複記錄是根據單個欄位（peopleId）來判斷
sql語句
SELECT * FROM people GROUP BY peopleId HAVING count(peopleId) > 1
sql語句
2、刪除表中多餘的重複記錄，重複記錄是根據單個欄位（peopleId）來判斷，只留有rowid最小的記錄
sql語句
DELETE FROM people WHERE peopleName IN (SELECT peopleName FROM people GROUP BY peopleName HAVING count(peopleName) > 1) AND peopleId NOT IN (SELECT min(peopleId) FROM people GROUP BY peopleName HAVING count(peopleName) > 1)
1、查詢表中多餘的重複記錄，重複記錄是根據單個欄位（peopleId）來判斷
sql語句
SELECT * FROM people GROUP BY peopleId HAVING count(peopleId) > 1
2、刪除表中多餘的重複記錄，重複記錄是根據單個欄位（peopleId）來判斷，只留有rowid最小的記錄
sql語句
DELETE FROM people WHERE peopleName IN (SELECT peopleName FROM
people GROUP BY peopleName HAVING count(peopleName) > 1 )AND peopleId NOT IN ( SELECT min(peopleId) FROM people GROUP BY peopleName HAVING count(peopleName) > 1)
3、查詢表中多餘的重複記錄（多個欄位）
sql語句
SELECT * FROM AAA a WHERE (a.peopleId, a.seq) IN (SELECT peopleId,seq
FROM AAA GROUP BY peopleId, seq HAVING count(*) > 1 )
4、刪除表中多餘的重複記錄（多個欄位），只留有rowid最小的記錄
sql語句
DELETE FROM vitaea WHERE (a.peopleId, a.seq) IN (SELECT peopleId, seq
FROM vitae GROUP BY peopleId, seq HAVING count(*) > 1) ANDrowid NOT IN (SELECT min(rowid) FROM vitae GROUP BY peopleId, seq HAVING count(*) > 1)
5、查詢表中多餘的重複記錄（多個欄位），不包含rowid最小的記錄
sql語句
SELECT * FROM vitae a WHERE (a.peopleId, a.seq) IN (SELECT peopleId, seq
FROM vitae GROUP BY peopleId,seq HAVING count(*) > 1) AND rowid NOT IN (SELECT min(rowid) FROM vitae GROUP BY peopleId,seq HAVING count(*) > 1)