05mycat父子表

表连接的难题在mycat中是不允许跨分片做表连接查询的

创建t_orders表

create table t_orders(

id int PRIMARY key,

customer_id int not null,

datetime TIMESTAMP DEFAULT CURRENT_TIMESTAMP

);

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use chinasoft;

create table t_customer(

id int primary key,

username varchar(200) not null,

sharding_id int not null

);

use chinasoft;

select * from t_customer;

insert into t_customer(id,username,sharding_id) values(1,"tom",101);

insert into t_customer(id,username,sharding_id) values(2,"jack",102);

insert into t_customer(id,username,sharding_id) values(3,"smith",105);

insert into t_customer(id,username,sharding_id) values(4,"lily",102);

insert into t_customer(id,username,sharding_id) values(5,"lucy",103);

insert into t_customer(id,username,sharding_id) values(6,"hanmeimei",104);

create table t_orders(

id int PRIMARY key,

customer_id int not null,

datetime TIMESTAMP DEFAULT CURRENT_TIMESTAMP

);

INSERT into t_orders(id,customer_id) values(1,1);

INSERT into t_orders(id,customer_id) values(2,1);

INSERT into t_orders(id,customer_id) values(3,1);

select c.username,o.id,o.datetime from t_customer c join t_orders o on c.id=o.customer_id;