sqlserver入門語句總結教程

本文是一篇對sqlserver入門語句總結的文章，希望可以對有需要的朋友有些幫助。

create相關

•show database; 顯示出現有的數據庫

•use database_x; 現在要使用數據庫database_x

•create table coffee (id int(5) not null,coffee_name varchar(25)); 創建一張表，包含id和coffee_name兩個字段

•alter table coffee add taste varchar(10); 增加新的一列

•insert into coffee (id,coffee_name,taste,rank) value ("1","BlueMountain"，“well”，“5”); 插入數據

•show columns from coffee; 查看表結構

•show create table coffee; 查看表信息，包括建表語句

•alter table student rename ss; 改變表名

•alter table ss drop mark; 刪除表ss中mark列

select語句

•select * from coffee where id="1"; 查詢出id=1的所有信息

•select coffee_name from coffee where id="2"; 查詢出id=2的coffee name

•select * from club where id between "1" and "3"; 查詢出id=1到3的條目

•select * from club where id="1" or id="3"; 查詢出id=1和id=3這兩個條目

•select club_name from club where mark>50; 查詢出mark大於50的club

•select club_name from club where mark not between  48 and 50; 查詢mark不在48與50之間的club

•select * from club where id in("1","3","4"); 查詢id=1,3,4的條目

•select * from club where id not in("1","3","4");

•select * from club where name like "M%r"; 通配符%表示任意長度的字符(可以是0，漢字為兩個字符)

•select * from club where name like "M_r"; _表示單個字符

•select * from club where id in("1","3","4") and mark>50; 多重查詢

•select * from club order by mark desc; 按照mark降序排列(desc：降序，usc：升序)

數量查詢相關

•select count(*) from club; 查詢club中有多少條記錄

•select count(distinct mark) from club; 不同分數的有多少條記錄

•select sum(mark) from club; 積分總和

•select avg(mark) from club; 平均積分

•select max(mark) from club; 最高積分

•select min(mark) from club; 最低積分

update語句

•update club set mark=mark-8 where id="1"; id=1的俱樂部積分罰8分

delete語句

•delete from club where id="001"; 刪除id=001的俱樂部信息

以上就是精品為大家提供關於sqlserver入門語句總結的文章，希望對大家有所幫助。