**建立表**：
use equipment;
create table ghes(
user varchar(20),
equipment_category varchar(20),
equipment_type varchar(20),
start_up_time datetime(6),
remarks varchar(50),
id int not null auto_increment,
primary key(id));
**向表中插入資料：**
insert into ghys(user,equipment_category,equipment_type,start_up_time) values("王燕","相容機","至強e3",
"2015-04-01")
**批量修改字段值：**
update ghys set equipment_type = replace(equipment_type,'至強e3','至強e3 1232')where id
<4;
**如何刪除一條記錄：**
delete from ghes where id=7;
**新增欄位並賦值：**
alter table equipment.szfy add usage_state varchar(10) default '正在使用';
alter table equipment.szfy add department varchar(10) default '市政分院' after id; 注：在某一字段前賦值
**多表查詢：**
select * from equipment.cwb union select * from equipment.ghes union select * from equipment.ghys union select * from equipment.ghss union select * from equipment.jszlb
union select * from equipment.jts union select * from equipment.jyb union select * from equipment.jzfy union select * from equipment.rlzyb union select * from equipment.szfy
union select * from equipment.tdb union select * from equipment.xxb union select * from equipment.yld union select * from equipment.zxb order by department;
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