一、操作表記錄(增刪改查，create,read,update,delete)
1.insert
insert into table_name [(column [,column.....])] values (value [,value......]);
insert into employee (id,name,gender,birthday,entry_data,job,salay,resume)
values (null,'賴澤銨','男','1996-7-7','2018-12-8','python工程師',5000,'啥都會');
insert into employee values (null,'吳志雄','男','2000-1-1','2001-2-2','董事長','1','全靠他了'),(null,'賴澤銨','男','1996-7-7','2018-12-8','python工程師',5000,'啥都會'); #所有列都寫入可以不寫 ，插入多條
2.update
update tbl_name set col_name=exprl [,col_name2=expr2......]
(1)將所有員工薪水改為5000
update employee set salay= 5000;
(2)將賴澤銨薪水改為3000
update employee set salay = 3000 where name='賴澤銨';
(3)將侯文澤薪水改為4000，job改為c++
update employee set salay = 4000,job = 'c++' where name = '侯文澤';
(4)將鄭嘉穎薪水增加1000
update employee set salay = salay+1000 where name = '鄭嘉穎';
3.delet (truncate) #truncate整表摧毀
delete from table_name [where where_definition]
(1)刪除表中名為侯文澤的記錄
delete from employee where name = '侯文澤';
(2)刪除表中所有記錄
delete from employee;
(3)使用truncate刪除表中記錄
truncate employee;
4.select
select [distinct] * | from table;
(1)查詢表中所有員工的資訊
select * from employee;
(2)查詢表中所有員工的姓名和薪水
select name,salay from employee;
(3)過濾表中重複資料
select distinct salay from employee;
(4)在所有員工薪水上+1000
select name,salay+1000 from employee;
(5)統計每個學生的總分
create table grade (
id int primary key auto_increment,
name varchar(20),
chinese int,
math int,
english int
insert into grade values (null,'侯文澤',70,80,90),(null,'鄭嘉穎',79,85,92),(null,'賴澤銨',90,90,40);
select name,chinese+math+english from grade;
(6)使用別名表示學生的總分
select name as 姓名 ,chinese+math+english as 總成績 from grade;
select name 姓名 ,chinese+math+english 總成績 from grade;
5.帶有where的查詢
(1)查詢姓名為***的學生成績
select * from grade where name = '賴澤銨';
(2)查詢英語成績大於90的同學
select * from grade where english>90;
(3)查詢總分大於230分的所有同學
select * from grade where chinese+math+english>230;
(4)where 常用運算子
~：> < <= >= = <>#不等於
select * from grade where chinese<>80;
~：between ... and .... #在之間
select * from grade where math between 70 and 85;
~：in(set) #括號內為集合
select * from grade where english in (80,85,90);
~：like #像，萬用字元% ，『_』 表示乙個字元
select * from grade where name like '賴%';
select * from grade where name like '文';
~：and or not #邏輯運算子
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