SQL数据库语句大全集锦(2)

发布时间:2021-06-08

SQL数据库语句大全集锦

value
  ex:(宿主)
 select * from stock_information where stockid  = str(nid)
   stockname = ’str_name’
   stockname like ’% find this %’
   stockname like ’[a-zA-Z]%’ --------- ([]指定值的范围)
   stockname like ’[^F-M]%’  --------- (^排除指定范围)
   --------- 只能在使用like关键字的where子句中使用通配符)
   or stockpath = ’stock_path’
   or stocknumber < 1000
   and stockindex = 24
   not stocksex = ’man’
   stocknumber between 20 and 100
   stocknumber in(10,20,30)
   order by stockid desc(asc) --------- 排序,desc-降序,asc-升序
   order by 1,2 --------- by列号
   stockname = (select stockname from stock_information where stockid = 4)
   --------- 子查询 / oYIpsxSPAIC
   --------- 除非能确保内层select只返回一个行的值,
   --------- 否则应在外层where子句中用一个in限定符
 select distinct column_name form table_name --------- distinct指定检索独有的列值,不重复
 select stocknumber ,"stocknumber + 10" = stocknumber + 10 from table_name
select stockname , "stocknumber" = count(*) from table_name group by stockname
        --------- group by 将表按行分组,指定列中有相同的值
     having count(*) = 2 --------- having选定指定的组
 select * from table1, table2  
 where table1.id *= table2.id -------- 左外部连接,table1中有的而table2中没有得以null表示
   table1.id =* table2.id -------- 右外部连接

 select stockname from table1
 union [all] ----- union合并查询结果集,all-保留重复行
 select stockname from table2

***insert***

 insert into table_name (Stock_name,Stock_number) value ("xxx","xxxx")
       value (select Stockname , Stocknumber from Stock_table2)---value为select语句

***update***

 update table_name set Stockname = "xxx" [where Stockid = 3]
     Stockname = default
     Stockname = null
     Stocknumber = Stockname + 4

***delete***

 delete from table_name where Stockid = 3
 truncate table_name ----------- 删除表中所有行,仍保持表的完整性
 drop table table_name --------------- 完全删除表

***alter table*** --- 修改数据库表结构

 alter table database.owner.table_name add column_name char(2) null .....
 sp_help table_name ---- 显示表已有特征
 create table table_name (name char(20), age smallint, lname varchar(30))
 insert into table_name selec
t ......... ----- 实现删除列的方法(创建新表)
 alter table table_name drop constraint Stockname_default ---- 删除Stockname的default约束
***function(/*常用函数*/)***

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