数据库基本查询语句规范为：select 区域 from 表名
查询指定表
select * from 表名
*：代表所有列
示例：select * from TL_REQUEST
查询指定列
select 列名 from 表名
列名：代表从指定的列名中查找
,：如果是查找对应的多列，则用英文逗号间隔
示例：
select BU_NO from TL_REQUEST
select BU_NO,BU_NM from TL_REQUEST
条件查询
select * from 表名 where 条件
*：代表所有列
条件：一般都是where加条件表达式
查询列里包含数字或字母：select * from 表名 where 列名='值'
示例：
select * from TL_REQUEST where BU_NO='1234'
select * from TL_REQUEST where BU_NM='小芳'
范围查询
select * from 表名 where 列名 between 'A' and 'B'
或
select * from 表名 where 列名>='A' and 列名<='B'
示例：
selectfrom TL_REQUEST where BU_NO between '1000' and '1234'selectfrom TL_REQUEST where BU_NO>='1000' and BU_NO<='1234'
多条件查询或条件查询：or
select * from 表名 where 列名='A' or列名='B'
示例：select * from TL_REQUEST where BU_NO='1000' or BU_NO='1234'
和条件查询：and
select * from 表名 where 列名='A' and列名='B'
示例：select * from TL_REQUEST where BU_NO='1000' and CONTRACT_NO='tl001'
离散查询
包含值查询：in()
select * from 表名 where 列名='A' 列名='B' 列名='C'
或：
select * from 表名 where 列名 in('A','B','C')
示例：
select * from TL_REQUEST where BU_NO='1000' BU_NO='1234' BU_NO='1311'
或：
select * from TL_REQUEST where BU_NO in('1000','1234','1311')
不包含值查询：not in()
select * from 表名 where 列名 not in('A','B','C')
示例：select * from TL_REQUEST where BU_NO not in('1000','1234','1311')
模糊查询
查询列里包含具体中文：select * from 表名 where 列名like '%中文%'
Like：名称前面加。
%：任意多个字符。
_：下划线表示任意一个字符。
示例：select * from TL_REQUEST where BU_NM like '%杜芳%'
或查询第二个字符为芳的情况
select * from TL_REQUEST where BU_NM like '%_芳%'
去重查询
select distinct 列名 from 表名
示例：select distinct BU_NO from TL_REQUEST
组合查询
select distinct 列名 from 表名 where 条件
示例：select distinct BU_NO from TL_REQUEST where BU_NO between '1000' and '1234'
select * from ydb02 WHERE EFFECT LIKE '%肾虚%'
select * from ydb01
select * FROM ydb01 WHERE name='阿胶膏'
select * FROM ydb01 WHERE name='阿胶散'
select * from ydb02 WHERE EFFECT LIKE '%肾虚%'
SELECT * FROM ydb02 WHERE EFFECT like '%早泄%'
select distinct NAME_CN from ydb02
授权用户远程登录
SELECT user, host FROM mysql.user;
CREATE USER 'root'@'%' IDENTIFIED BY 'Likun@123'；
GRANT ALL PRIVILEGES ON . TO 'root'@'%';
FLUSH PRIVILEGES;
导入数据库
mysql -uroot -pmhflove18L ysgc <ysgc.sq