MySQL深入学习
作者:互联网
DML数据操纵语言
insert into
-- 插入
insert into biaoA(column_1,column_2) values('value1','value2')
update
-- 更新
update biaoA
set column_1 = 'value1', column_2 = 'value2'
where condition
-- value可以是变量:时间
delete
-- 删除
delete from biaoA
where condition
truncate
-- 删除(自增会清零)
truncate biaoA
数据库重启:
InnoDB 自增列会从1开始(存在内存之中,断电即失)
MyISAM 继续从上一个自增量开始(存在于文件中,不会丢失)
DQL数据查询语言
select & 别名
-- 选中全部
select *
from biao_a ba
-- 拼接
select concat('名称: ',column_1)
from biao_a ba
distinct
-- 去重
select distinct column_1
from biao_a
-- 增加+1
select column_1 + 1
from biao_a
where
select column_1
from biao_a
where column_1 between 95 and 100
-- is not null
-- is null
-- like(_, __, %)
-- in(100,'value1','value2')
join
select ba.column_1, bb.column_2, bb.column_5
from biao_a ba
(inner) join biao_b
on ba.column_1 = bb.column_1
标签:ba,column,biao,学习,深入,MySQL,where,select,biaoA 来源: https://www.cnblogs.com/WeirJin-cloud/p/13044631.html