-- 查看数据库

show databases;

-- 使用数据库

use test;

-- 创建表格 user_info

create table user_info(

phone varchar(20),

star_sign varchar(10),

area varchar(10),

city varchar(10),

customer_name varchar(10),

age int,

gender varchar(10),

curr_bal decimal,

uncurr_bal decimal);

-- 向表格内插入数据

insert into user_info values('13100000001','金牛','河北','石家庄','邓伦',27,'男',80,200),

('13100000002','双子','北京','北京','黄磊',49,'男',30,400),

('13100000003','处女', '河南','濮阳',null,35,'男',600,0),

('13100000004','白羊','湖南','长沙','张艺兴',28,'男',20,10),

('13100000005','天秤','新疆','乌鲁木齐','迪丽热巴',27,'女',10,50);

-- 查询表格

select * from user_info;

-- 查询实名账户（姓名不为空）：手机号，姓名

select phone,customer_name from user_info where customer_name is not null;

-- 查询账户余额大于40小于1000（可提现余额+不可提现余额）：手机号，姓名

select phone,customer_name from user_info where (curr_bal+uncurr_bal) between 40 and 1000;

-- 查询年龄30-59（包括30和59）：手机号，姓名

select phone,customer_name from user_info where age between 30 and 59 ;