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mysql数据库通过mycat分表,多表关联查询无结果 #2920

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cz-liu opened this issue Jul 22, 2022 · 1 comment
Open

mysql数据库通过mycat分表,多表关联查询无结果 #2920

cz-liu opened this issue Jul 22, 2022 · 1 comment

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@cz-liu
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cz-liu commented Jul 22, 2022

描述你使用过程中遇到的问题: **
前提条件:
mycat-版本1.6.7.6,数据库-版本5.7.25,源码增加按年拆分规则代码打包。
使用中:
一个库对部分表进行按年拆分多张表,通过mycat 插入保存数据,查看逻辑库数据保存到拆分后的表中。
条件相同,单表查询OK,关联查询查不到值。
实例:
1.通过mycat连接查询,无结果
SELECT a.

FROM table_A a
LEFT JOIN table_B b ON b.id = a.id
WHERE a.create_time BETWEEN '2024-08-01 00:00:00' AND '2024-08-10 23:59:59'
2.通过原始数据库查询,结果正确
SELECT a.

FROM table_A_2024 a
LEFT JOIN table_B b ON b.id = a.id
WHERE a.create_time BETWEEN '2024-08-01 00:00:00' AND '2024-08-10 23:59:59'

请问以上问题应该怎么处理呢?

@cz-liu cz-liu changed the title 通过mycat多表关联查询无结果 mysql数据库通过mycat分表,多表关联查询无结果 Jul 22, 2022
@caofei996
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不在一个分片上的无法进行关联查询。建议使用水平拆分表,

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